WO2010092800A1 - 試験装置および試験方法 - Google Patents
試験装置および試験方法 Download PDFInfo
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- WO2010092800A1 WO2010092800A1 PCT/JP2010/000790 JP2010000790W WO2010092800A1 WO 2010092800 A1 WO2010092800 A1 WO 2010092800A1 JP 2010000790 W JP2010000790 W JP 2010000790W WO 2010092800 A1 WO2010092800 A1 WO 2010092800A1
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- strobe
- response signal
- data width
- change point
- jitter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/317—Testing of digital circuits
- G01R31/3181—Functional testing
- G01R31/319—Tester hardware, i.e. output processing circuits
- G01R31/3193—Tester hardware, i.e. output processing circuits with comparison between actual response and known fault free response
- G01R31/31937—Timing aspects, e.g. measuring propagation delay
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/02—Measuring characteristics of individual pulses, e.g. deviation from pulse flatness, rise time or duration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/317—Testing of digital circuits
- G01R31/3181—Functional testing
- G01R31/319—Tester hardware, i.e. output processing circuits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/317—Testing of digital circuits
- G01R31/3181—Functional testing
- G01R31/319—Tester hardware, i.e. output processing circuits
- G01R31/31917—Stimuli generation or application of test patterns to the device under test [DUT]
- G01R31/31922—Timing generation or clock distribution
Definitions
- the present invention relates to a test apparatus and a test method.
- this application is a continuation of US application 12 / 370,609 (filing date: February 13, 2009).
- Patent Document 1 As a semiconductor test apparatus, an apparatus for measuring the width (hereinafter referred to as a data width) of an eye opening (hereinafter referred to as a data window) of a response signal output from a device under test in response to a test signal is known. (For example, refer to Patent Document 1).
- Patent Document 1 WO2007 / 091413
- the semiconductor test apparatus determines pass / fail of the device under test based on whether the data width is within a predetermined range.
- the semiconductor test apparatus generates a strobe signal used for data width measurement, and detects the leading and trailing edges of the response signal based on the strobe signal.
- the data width can be measured from the timing difference between the leading and trailing edges of the response signal.
- an object of one aspect of the technical innovation (innovation) included in the present specification is to provide a test apparatus and a test method capable of solving the above-described problems. This object is achieved by a combination of features described in the independent claims.
- the dependent claims define further advantageous specific examples of the present invention.
- an example exe multiple strobe including a plurality of strobes arranged at predetermined time intervals
- Multi-strobe generation unit that occurs every period, logical value of response signal output by device under test, data detection unit that detects according to each strobe, and change point of logical value output by data detection unit
- a test apparatus including a data width detection unit that detects a data width indicating a period in which a logical value of a response signal matches a predetermined expected value.
- an example exe (exemplary) ⁇ ⁇ ⁇ a multi-strobe including a plurality of strobes arranged at a predetermined time interval, Multi-strobe generation stage that occurs every period, logical value of response signal output from device under test, data detection stage that detects according to each strobe, and each change point of logical value detected in data detection stage And a data width detecting step of detecting a data width indicating a period in which the logical value of the response signal coincides with a predetermined expected value.
- FIG. 1 shows a configuration of a test apparatus 100 according to the present embodiment.
- the relationship between the response signal 102 and the multi-strobe signal 105 is shown.
- the relationship between the response signal 102 and the multi-strobe signal 105 when the period of the multi-strobe signal 105 is longer than the data width is shown.
- a relationship between the response signal 102 and the multi-strobe signal 105 when two change points of the response signal 102 are detected by one multi-strobe signal 105 is shown. Details of the data detection and determination method are shown.
- a method of determining that the device under test 200 is a non-defective product based on the measurement result of the data width is shown.
- a method for determining that the device under test 200 is a defective product based on the measurement result of the data width is shown.
- 6 shows a relationship between a response signal 102 and a multi-strobe signal 105 according to another embodiment. 6 shows a relationship between a response signal 102 and a multi-strobe signal 105 according to another embodiment. 6 shows a relationship between a response signal 102 and a multi-strobe signal 105 according to another embodiment.
- the structure of the test apparatus 100 which concerns on other embodiment is shown. A method for detecting the amount of jitter will be described. A method of determining that the device under test 200 is a non-defective product based on the measurement result of the jitter amount for each pin is shown. A determination method in the case where the edge selection signal 124 is a signal indicating that a rising edge is selected will be described.
- FIG. 1 shows a configuration of a test apparatus 100 according to the present embodiment.
- a test apparatus 100 tests a device under test 200 such as a semiconductor circuit.
- the test apparatus 100 may be connected to a plurality of pins of the device under test 200.
- the test apparatus 100 supplies a test signal 101 to the device under test 200.
- the device under test 200 outputs a response signal 102 in response to the test signal 101.
- the test signal 101 may be a signal having a predetermined logic pattern, a clock signal, or the like, for example.
- the test apparatus 100 includes a plurality of test function units (in this example, a test function unit 20, a test function unit 40, and a test function unit 60), a control unit 70, a level comparator 80, a multi-strobe generation unit 82, and an expected value generation unit 83. And a device window determination unit 84.
- the test function unit 20, the test function unit 40, and the test function unit 60 are connected to different output pins of the device under test 200, respectively.
- the test apparatus 100 may have a number of test function units corresponding to the number of pins of the device under test 200.
- the test function unit 20 includes a data detection unit 22, a selection unit 24, and a data width detection unit 25.
- the data width detection unit 25 includes a window sequential determination unit 26 and a window accumulation determination unit 28.
- Each of the test function unit 40 and the test function unit 60 may have the same configuration as the test function unit 20.
- the level comparator 80 compares the signal level of the response signal 102 received from the device under test 200 with a predetermined threshold value.
- the level comparator 80 may compare the signal level of the response signal 102 with each of the relatively high voltage threshold VH and the relatively low voltage threshold VL.
- the level comparator 80 may generate logical data indicating the comparison result between the signal level of the response signal 102 and the threshold value for each threshold value, and output the logical data to the data detection unit 22.
- the level comparator 80 outputs a logic signal 103 indicating a pass (logic value 0) when the signal level of the response signal 102 is greater than the threshold value VH, and indicating a fail (logic value 1) when it is less than the threshold value VH. Further, the level comparator 80 outputs a logical signal 104 indicating a pass (logical value 0) when the signal level of the response signal 102 is smaller than the threshold value VL, and indicating fail (logical value 1) when larger than the threshold value VL.
- the test apparatus 100 may include a plurality of level comparators 80 corresponding to the respective pins of the device under test 200. Each level comparator 80 may output the logic signal 103 and the logic signal 104 to the data detection unit 22 of the corresponding test function unit.
- the multi-strobe generator 82 generates a multi-strobe signal 105 including a plurality of strobe signals arranged at a predetermined time interval for each predetermined test cycle.
- the multi-strobe generator 82 may generate a multi-multi-strobe signal 105 including a plurality of equally spaced strobe signals.
- the multi-strobe generator 82 may generate each multi-strobe signal 105 so that a plurality of strobe signals are arranged over a period longer than the period of the response signal 102. For example, the time obtained by multiplying the interval between the plurality of strobe signals included in the multi-strobe signal 105 by the number of strobe signals may be longer than the period of the response signal 102. The period of the multi-strobe may be longer than the period of the response signal 102 by shortening the period of the response signal 102 of the device under test 200.
- the multi-strobe generating unit 82 multi-strobes over a period longer than 1 ⁇ 2 of the test period and shorter than the test period.
- a signal 105 may be generated.
- the multi-strobe generator 82 generates each multi-strobe signal 105 so as to be arranged over a period longer than the period of the response signal 102 when the period of the response signal 102 is shorter than a predetermined time. May be.
- the multi-strobe generator 82 may switch whether or not the multi-strobe signal 105 is arranged over a period longer than the period of the response signal 102 in accordance with a change in the frequency of the response signal 102.
- the expected value generator 83 outputs the expected value 108 of the logical value of the response signal 102 received from the device under test 200 to the selector 24.
- the expected value generation unit 83 may output an expected value 108 corresponding to the test signal 101.
- the data detection unit 22 detects the logical value of the response signal 102 output from the device under test 200 according to each strobe signal.
- the data detection unit 22 may latch the logic signal 103 and the logic signal 104 with the multi-strobe signal 105 output from the multi-strobe generation unit 82, and generate the corresponding logic data 106 and logic data 107, respectively.
- the data detection unit 22 outputs the logical data 106 and the logical data 107 to the selection unit 24.
- the selection unit 24 selects either the logical data 106 or the logical data 107 based on the expected value 108 output from the expected value generation unit 83.
- the selection unit 24 outputs any selected logical data to the data width detection unit 25 as selection data 109.
- the selection unit 24 may select the logical data 106 corresponding to the high voltage threshold value VH.
- the selection unit 24 may select the logical data 107 corresponding to the low voltage threshold VL.
- the selection data 109 is “0”
- the logical value of the response signal 102 is a “pass” state in which the logical value of the response signal 102 matches the expected value 108
- the selection data 109 is “1”
- the logical value of the response signal 102 Indicates a “fail” state that does not match the expected value 108.
- the data width detection unit 25 detects a data width indicating a period in which the logical value of the response signal 102 matches the predetermined expected value 108 based on each change point of the logical value output by the data detection unit 22. Based on all the change points detected by one multi-strobe signal 105, the data width detection unit 25 determines a period in which the logical value of the response signal 102 matches the predetermined expected value 108 in the period of the multi-strobe signal. The indicated data width may be detected. The data width detection unit 25 may detect the data width based on each change point of the selection data 109 output from the selection unit 24.
- the data width detection unit 25 has a first change point at which the logical value of the response signal 102 changes to the expected value 108, and a second change at which the logical value of the response signal 102 changes from the expected value 108.
- the data width is detected based on the positions of the first change point and the second change point.
- the data width detection unit 25 includes a first change point at which the selection data 109 received from the selection unit 24 changes from “1” to “0” and a second change point at which “0” changes to “1”. The data width may be detected based on the position.
- the data width detection unit 25 determines that the logical value of the response signal 102 is the expected value after the first change point at which the logical value of the response signal 102 changes to the expected value 108 in one multi-strobe signal 105.
- the data width may be detected based on the relative position difference between the first change point and the second change point.
- the data width detection unit 25 may detect the data width by detecting the relative phase difference between the first change point and the second change point using a counter.
- the window sequential determination unit 26 outputs a window sequential determination result 110 indicating whether or not the detected data width is within a predetermined allowable range to the control unit 70 for each multi-strobe signal 105. Specifically, the window sequential determination unit 26 changes the first change point where the selection data 109 received from the selection unit 24 changes from “1” to “0”, and changes from “0” to “1”. Based on the second change point, the data width of the response signal 102 is detected. The window sequential determination unit 26 may determine whether or not the data width of the response signal 102 is within an allowable range based on the data width reference value 112 output from the control unit 70.
- the window accumulation determination unit 28 detects the relative position between the first phase change point having the latest phase detected from the plurality of multi-strobe signals 105 and the phase change phase having the earliest phase among the second change points.
- a window accumulation determination result 114 indicating whether or not the phase difference is within a predetermined allowable range is output.
- the window accumulation determination unit 28 may accumulate the selection data 109 received from the selection unit 24 in association with each of a plurality of strobe signals having different phases included in the plurality of multi-strobe signals 105. Further, the window accumulation determination unit 28 detects the phase of the change point with the latest phase among the first change points and the phase of the change point with the earliest phase among the second change points based on the accumulated comparison results. You can do it.
- the window accumulation determination unit 28 may accumulate the selection data 109 in memories having different addresses for each of the multi-strobe signals 105 having different phases. Further, the window accumulation determination unit 28 may determine whether or not the data width of the response signal 102 is within an allowable range based on the data width reference value 112 output from the control unit 70.
- the test apparatus 100 may test a plurality of pins of the device under test 200 in parallel.
- the device window determination unit 84 determines pass / fail of the device under test 200 based on the determination result in the data width detection unit 25 included in each test function unit. Specifically, the device window determination unit 84 acquires the window accumulation determination result 114 for each pin from the window accumulation determination unit 28 included in the test function unit 20, the test function unit 40, and the test function unit 60. To do.
- the test function unit 40, or the test function unit 60 When the determination result output from the test function unit 20, the test function unit 40, or the test function unit 60 indicates that the device window determination unit 84 is outside the range of the data width reference value 112, It may be determined that the device under test 200 is defective. The device window determination unit 84 may notify the control unit 70 of the determination result.
- FIG. 2 shows an example of a method for detecting the data width of the response signal 102.
- the rising change point (leading edge) and the falling change point (rear edge) of the response signal 102 are detected using separate multi-strobes.
- the frequency of the response signal 102 in the figure is 1 Gbps, and the data width corresponding to one period of the response signal 102 is 1000 ps.
- the multi-strobe generator 82 outputs the multi-strobe signal 105 over a period of 600 ps around the rising change point of the response signal 102 and around the falling change point of the response signal 102.
- the multi-strobe generating unit 82 may start outputting the multi-strobe signal 105 at a timing earlier than the timing at which the response signal 102 is expected to rise. In addition, when detecting the falling timing of the response signal 102, the multi-strobe generator 82 may start outputting the multi-strobe signal 105 at a timing earlier than the timing at which the response signal 102 is expected to fall. .
- FIG. 3 shows the relationship between the response signal 102 and the multi-strobe signal 105 when the frequency of the response signal 102 is increased and the output period of the multi-strobe signal 105 generated by the multi-strobe generator 82 is longer than the data width. Indicates.
- the multi-strobe generation unit 82 outputs the multi-strobe signal 105 over 600 ps from before the rising timing of the response signal 102 when detecting the rising change point of the response signal 102.
- the multi-strobe generator 82 outputs the multi-strobe signal 105 over 600 ps from before the falling timing of the response signal 102 when detecting the falling change point of the response signal 102.
- the frequency of the response signal 102 is higher than the frequency of the response signal 102 in FIG. 2, so the multi-strobe generator 82 performs multi-strobe over a period longer than the data width of the response signal 102.
- the signal 105 is output.
- both the rising change point and the falling change point of the response signal 102 may be included in the period of one multi-strobe signal 105.
- the test apparatus 100 detects two change points of the response signal 102 using one multi-strobe signal 105. Is preferred.
- FIG. 4 shows the relationship between the response signal 102 and the multi-strobe signal 105 when two change points of the response signal 102 are detected by one multi-strobe signal 105.
- the multi-strobe generator 82 starts outputting the multi-strobe signal 105 before the first data change point of the response signal 102 and outputs the multi-strobe signal 105 until after the second data change point of the response signal 102.
- the test apparatus 100 can shorten the data width measurement time by detecting two change points of the response signal 102 using one multi-strobe signal 105.
- FIG. 5 shows details of the data width detection method.
- the value of the response signal 102 output from the device under test 200 changes in response to the test signal 101 output from the test apparatus 100 to the device under test 200.
- jitter occurs at the changing point of the response signal 102 due to the influence of noise or the like.
- the test apparatus 100 may determine pass / fail of the device under test 200 based on the length of the data width after detecting the data width of the data window corresponding to a period during which jitter does not occur.
- the multi-strobe signal 105 used for data width measurement has 16 strobe signals having different phases.
- the multi-strobe generator 82 outputs a strobe signal of the first phase at a timing before the first change point of the response signal 102.
- the multi-strobe generator 82 sequentially generates a plurality of strobe signals at regular intervals following the first-phase strobe signal.
- the multi-strobe generator 82 generates the 16th phase strobe signal after the second timing when the value of the response signal 102 changes.
- the selection unit 24 selects one of the logical data 106 and the logical data 107 based on the value of the expected value 108, and outputs the selection data 109 to the data width detection unit 25.
- the selection data 109 indicates a path (logical value 0), and when the output value of the level comparator 80 does not match the expected value 108
- the selection data 109 indicates a failure (logical value 1).
- the selection unit 24 sets “1”. Is output. In the fourth to twelfth phases of the multi-strobe signal 105, the logical value of the response signal 102 matches the expected value 108, and therefore the selection unit 24 outputs “0”. Similarly, the selection unit 24 outputs “1” in the 13th to 16th phases of the multi-strobe signal 105.
- the window sequential determination unit 26 acquires selection data 109 output from the selection unit 24.
- the window sequential determination unit 26 detects that the selection data 109 changes from “1” to “0” in the fourth phase and the selection data 109 changes from “0” to “1” in the thirteenth phase. .
- the window sequential determination unit 26 detects that the data width is a length corresponding to 9 times 9 sts of the strobe interval Ts.
- the window sequential determination unit 26 receives the data width reference value 112 from the control unit 70.
- the window sequential determination unit 26 compares the detected data width value with the data width reference value 112 to determine pass / fail of the corresponding pin of the device under test 200. For example, when the data width reference value 112 indicates “5 Ts or more and 10 Ts or less”, the length corresponding to 9 Ts of the multi-strobe signal 105 satisfies the condition indicated by the data width reference value 112. Therefore, in this case, the window sequential determination unit 26 may determine that the corresponding pin of the device under test 200 is normal and output the determination result to the control unit 70.
- the test apparatus 100 can improve the measurement accuracy by performing the measurement of the response signal 102 a plurality of times using a plurality of multi-strobe signals 105. Since the timing at which the device under test 200 outputs the response signal 102 varies, the selection data 109 output by the selection unit 24 varies with each measurement. For example, in the second measurement in FIG. 5, the selection unit 24 outputs “0” as the selection data 109 between the fifth phase and the fourteenth phase. In the third measurement, the selection unit 24 outputs “0” between the second phase and the eleventh phase.
- the window accumulation determination unit 28 may store the selection data 109 output from the selection unit 24 in association with the respective phases of the strobe signals included in the multi-strobe signal 105 during the generation period of the plurality of multi-strobe signals 105. Further, the window accumulation determination unit 28 may detect the leading edge phase and the trailing edge phase of the data window based on the selection data 109 output from the selection unit 24.
- the window accumulation determination unit 28 detects the leading edge phase of the data window, the phase of the phase in which the selection data 109 output from the selection unit 24 changes from “1” to “0” among the measurement results of a plurality of times. Of these, the slowest phase is selected. For example, in FIG. 5, the fifth phase in which the selection data 109 has changed from “1” to “0” in the second and fifth measurements is the slowest phase. Therefore, the window accumulation determination unit 28 detects that the leading edge phase is the fifth phase.
- the window accumulation determination unit 28 detects the trailing edge phase of the data window, the selection data 109 output from the selection unit 24 among a plurality of measurement results changes from “0” to “1”.
- the earliest phase is selected from the selected phases. For example, in FIG. 5, the twelfth phase in which the selection data 109 has changed from “0” to “1” in the third measurement is the slowest phase. Therefore, the window accumulation determination unit 28 detects the eleventh phase, which is the phase immediately before the phase in which the selection data 109 has changed from “0” to “1”, as the trailing edge phase.
- the window accumulation determination unit 28 detects the data width based on the detected values of the leading edge phase and trailing edge phase.
- the window accumulation determination unit 28 may determine pass / fail of the corresponding pin by comparing the detected data width with the data width reference value 112.
- the window accumulation determination unit 28 outputs the pin pass / fail determination result to the device window determination unit 84.
- the device window determination unit 84 acquires determination results for the pins of the device under test 200 corresponding to the test function unit 20, the test function unit 40, and the test function unit 60.
- the device window determination unit 84 may determine pass / fail of the device under test 200 based on the acquired determination result.
- FIG. 6 shows a method of determining that the device under test 200 is a non-defective product based on the data width measurement result.
- the leading edge phase of the data window in the response signal 102 output from the pin 1 is the fifth phase, and the trailing edge phase is the eleventh phase.
- the leading edge phase at pin 2 is the sixth phase and the trailing edge phase is the eleventh phase.
- the leading edge phase at pin 3 is the fourth phase and the trailing edge phase is the tenth phase.
- the data width corresponding to the phase difference between the leading edge phase and the trailing edge phase is 6Ts, 5Ts, and 6Ts, respectively, and all fall within the range of 5Ts to 10Ts indicated by the data width reference value 112.
- the device window determination unit 84 determines that the device under test 200 is a non-defective product because the data width measurement values of all the pins are within the reference range.
- FIG. 7 shows a method of determining that the device under test 200 is a defective product based on the measurement result of the data width.
- the leading edge phase at pin 2 is the sixth phase
- the trailing edge phase is the tenth phase. Therefore, the data width at the pin 2 is 4Ts and is not within the reference range. Therefore, the device window determination unit 84 determines that the device under test 200 is a defective product.
- the device window determination unit 84 may output the determination result 116 to the control unit 70.
- the window accumulation determination unit 28 determines the quality of each pin of the device under test 200 and then outputs the window accumulation determination result 114 to the device window determination unit 84. However, the window accumulation determination unit 28 may output the detected data width value to the device window determination unit 84. The device window determination unit 84 determines whether the device under test 200 is acceptable based on the data width value output by the window accumulation determination unit 28 included in each test function unit and the data width reference value 112 output by the control unit 70. May be determined.
- the test apparatus 100 detects the data width of the response signal 102 with high accuracy by accumulating the selection data 109 in association with the phases of the plurality of strobe signals included in the plurality of multi-strobe signals 105. be able to. Furthermore, the test apparatus 100 can determine the quality of the device under test 200 in a short time by performing the test of the pins of the device under test 200 in parallel.
- FIG. 8 shows the relationship between the response signal 102 and the multi-strobe signal 105 according to another embodiment.
- the second change point at which the logical value of the response signal 102 changes from the expected value 108 is not included in the period in which the multi-strobe generator 82 generates the multi-strobe signal 105. Therefore, the multi-strobe generator 82 changes the logical value of the response signal 102 from the expected value 108 after the first change point at which the logical value of the response signal 102 changes to the expected value 108 in one multi-strobe signal 105.
- the position of the multi-strobe signal 105 may be adjusted.
- the multi-strobe generator 82 may adjust the position of the multi-strobe signal 105 to the position indicated by the post-position adjustment strobe signal in FIG.
- the data width detection unit 25 changes the logical value of the response signal 102 from the expected value 108 after the first change point at which the logical value of the response signal 102 changes to the expected value 108 in one multi-strobe signal 105.
- the data width may be detected based on the period from the first change point to the end point of the multi-strobe signal 105. For example, when the multi-strobe signal 105 is at the position of the pre-position adjustment strobe signal shown in FIG. 8, the data width detector 25 detects the first change point and the last phase strobe included in the pre-position adjustment strobe signal. The data width may be between the signals.
- the multi-strobe generation unit 82 changes the logical value of the response signal 102 from the expected value 108 after the first change point at which the logical value of the response signal 102 changes to the expected value 108 in one multi-strobe signal 105.
- the phase of the multi-strobe signal 105 may be delayed on condition that the data width detected by the data width detection unit 25 falls outside a predetermined allowable range. For example, when the multi-strobe signal 105 is at the position indicated by the pre-position adjustment strobe signal in FIG.
- the multi-strobe signal 105 may delay the phase of the multi-strobe signal 105 and change the position to the position indicated by the post-position adjustment strobe signal.
- the multi-strobe generator 82 does not have to change the phase of the multi-strobe signal 105 when the data width detected by the data width detector 25 is within the range of the data width reference value 112.
- the multi-strobe generation unit 82 may determine whether to change the phase of the multi-strobe signal 105 based on the determination result in the window successive determination unit 26. Further, the multi-strobe generation unit 82 may determine whether to change the phase of the multi-strobe signal 105 based on the control of the control unit 70.
- FIG. 9 shows the relationship between the response signal 102 and the multi-strobe signal 105 according to another embodiment.
- the data width detection unit 25 detects the first change point where the logical value of the response signal 102 changes to the expected value 108 before the second change point at which the logical value of the response signal 102 changes from the expected value 108.
- the data width may be detected based on the period from the start point of the multi-strobe signal 105 to the second change point. For example, when the multi-strobe signal 105 is located at the position indicated by the pre-position adjustment strobe signal in FIG. 9, the data width detection unit 25 performs the second change with the first phase strobe signal included in the pre-position adjustment strobe signal.
- the data width between points may be the data width.
- the multi-strobe generation unit 82 changes the logical value of the response signal 102 to the expected value 108 before the second change point at which the logical value of the response signal 102 changes from the expected value 108 in one multi-strobe signal 105.
- the phase of the multi-strobe signal 105 may be advanced on condition that the data width detected by the data width detection unit 25 falls outside the predetermined allowable range. For example, when the multi-strobe signal 105 is at the position indicated by the pre-position adjustment strobe signal in FIG.
- the multi-strobe signal 105 may change the position of the multi-strobe signal 105 to the position indicated by the post-position adjustment strobe signal by increasing the phase of the multi-strobe signal 105.
- the multi-strobe generation unit 82 does not have to change the phase of the multi-strobe signal 105 when the data width detected by the data width detection unit 25 is within the range of the data width reference value 112.
- FIG. 10 shows the relationship between the response signal 102 and the multi-strobe signal 105 according to another embodiment.
- the multi-strobe generation unit 82 is a first multi-strobe signal 105 in which the logical value of the response signal 102 changes to the expected value 108 after the second change point at which the logical value of the response signal 102 changes from the expected value 108.
- the multi-strobe generator 82 may change the phase of the multi-strobe signal 105 until the data width detected by the data width detector 25 falls within a predetermined allowable range.
- the multi-strobe generator 82 may change the position of the post-position adjustment strobe signal 1 in FIG. 10 by increasing the phase of the multi-strobe signal 105. Further, the multi-strobe generator 82 may change the position of the post-position adjustment strobe signal 2 in FIG. 10 by delaying the phase of the multi-strobe signal 105.
- FIG. 11 shows a configuration of a test apparatus 100 according to another embodiment.
- the test apparatus 100 further includes a device jitter determination unit 86.
- the test function unit 20 further includes a jitter detection unit 29.
- the jitter detector 29 detects the jitter at the change point of either the first change point or the second change point in each multi-strobe signal 105.
- the jitter detection unit 29 includes a jitter sequential determination unit 30 that outputs a sequential jitter determination result indicating whether or not the detected jitter is within a predetermined allowable range for each multi-strobe signal 105. Further, the jitter detector 29 determines whether or not the relative phase difference between the slowest phase and the fastest phase among the phases of the change points detected in the plurality of multi-strobe signals 105 is within a predetermined allowable range.
- the jitter accumulation determination unit 32 outputs a jitter accumulation determination result 120 indicating the above.
- the control unit 70 outputs the jitter amount reference value 122 to the jitter successive determination unit 30 and the jitter accumulation determination unit 32. Furthermore, the control unit 70 may output an edge selection signal 124 for selecting the polarity of the changing point of the selection data 109 whose jitter amount is to be measured, to the jitter successive determination unit 30 and the jitter accumulation determination unit 32.
- the test apparatus 100 may test a plurality of pins of the device under test 200 in parallel.
- the jitter detection unit 29 is provided for each pin of the device under test 200, and the test apparatus 100 includes a device jitter determination unit 86 for determining pass / fail of the device under test 200 based on the determination result in each jitter detection unit 29.
- the jitter succession determination unit 30 acquires the selection data 109 measured by the selection unit 24 a plurality of times. Based on the selection data 109, the jitter succession determination unit 30 detects the phase range of the multi-strobe signal 105 in which jitter has occurred. When the edge selection signal 124 is “1”, the jitter successive determination unit 30 may measure the jitter amount at the timing when the selection data 109 changes from “1” to “0”. Further, when the edge selection signal 124 is “0”, the jitter succession determination unit 30 may measure the jitter amount at the timing when the selection data 109 changes from “0” to “1”.
- the jitter successive determination unit 30 sends the jitter accumulation determination result 120 indicating that the measured pin is normal to the control unit 70. Output to.
- the jitter succession determination unit 30 shows the jitter accumulation determination result indicating that the measured pin is not normal. 120 is output to the control unit 70.
- the jitter accumulation determination unit 32 accumulates the selection data 109 measured by the selection unit 24 a plurality of times in association with the phases of the plurality of strobe signals included in the multi-strobe signal 105. The jitter accumulation determination unit 32 detects the jitter amount based on the accumulated selection data 109. The jitter accumulation determination unit 32 may determine whether the jitter amount of the corresponding pin is good or bad based on the jitter amount reference value 122 output from the control unit 70.
- the device jitter determination unit 86 acquires the jitter accumulation determination result 126 at the corresponding pins output by the test function unit 20, the test function unit 40, and the test function unit 60. The device jitter determination unit 86 determines pass / fail of the device under test 200 based on the acquired jitter accumulation determination result 126 at each pin. The device jitter determination unit 86 may notify the control unit 70 of the determination result.
- FIG. 12 shows a method for detecting the jitter amount.
- Each signal and selection data 109 in the figure is equal to each signal and selection data 109 shown in FIG.
- the jitter accumulation determination unit 32 detects the leading and trailing edges of the phase range of the multi-strobe signal 105 in which jitter occurs based on the selection data 109 shown in FIG.
- the timing of the falling change point at which the selection data 109 changes from “1” to “0” is the fourth phase, the fifth phase, and the second phase for each of the first measurement to the fifth measurement. , Fourth phase, and fifth phase. Therefore, the jitter accumulation determination unit 32 detects that the selection data 109 changes from “1” to “0” in the range from the second phase to the fourth phase. That is, the jitter accumulation determination unit 32 determines that the jitter leading edge phase (J1 in FIG. 12) when the selection data 109 changes from “1” to “0” is the second phase, and the jitter trailing edge phase ( Since J2) in FIG. 12 is the fourth phase, it is detected that the jitter amount is 3Ts.
- the timing at the rising change point at which the selection data 109 changes from “0” to “1” is the 13th phase, the 15th phase, the 12th phase, the 1st phase for each of the 1st measurement to the 5th measurement.
- FIG. 13 shows a method of determining that the device under test 200 is a good product based on the measurement result of the jitter amount for each pin.
- the jitter amount is 3Ts.
- the amount of jitter at the falling edge is 4Ts.
- the amount of jitter at the rising edge is 3Ts, 3Ts, and 5Ts in each of pins 1 to 3.
- the minimum value of the jitter amount reference value 122 is 1 Ts, and the maximum value of the jitter amount reference value 122 is 4 Ts.
- the edge selection signal 124 output from the control unit 70 to the jitter accumulation determination unit 32 indicates that the falling edge is selected. Therefore, the jitter accumulation determination unit 32 included in the test function unit 20, the test function unit 40, and the test function unit 60 has the jitter amount of the falling edge from the pin 1 to the pin 3 as a value indicated by the jitter amount reference value 122. Compare.
- the jitter accumulation determining unit 32 determines that the corresponding pin is a non-defective product. .
- the device jitter determination unit 86 determines that the device under test 200 is a good product based on the jitter accumulation determination result 126 output from the jitter accumulation determination unit 32 included in the test function unit 20, the test function unit 40, and the test function unit 60. Is determined.
- FIG. 14 shows a method of determining that the device under test 200 is a defective product based on the measurement result of the jitter amount for each pin.
- the amount of jitter at each pin is equal to the amount of jitter in FIG.
- the edge selection signal 124 indicates that a rising edge is selected. Therefore, the jitter accumulation determination unit 32 included in the test function unit 20, the test function unit 40, and the test function unit 60 determines the quality of the corresponding pin based on the jitter amount of the rising edge.
- the jitter accumulation determination unit 32 included in the test function unit 60 connected to the pin 3 determines that the pin 3 is not normal.
- the device jitter determination unit 86 may determine that the device under test 200 is a defective product based on the jitter accumulation determination result 126 output from the jitter accumulation determination unit 32 included in the test function unit 60.
- the jitter accumulation determination unit 32 determines the quality of each pin of the device under test 200 and then outputs the jitter accumulation determination result 126 to the device jitter determination unit 86. However, the jitter accumulation determination unit 32 may output the detected data width value to the device jitter determination unit 86.
- the device jitter determination unit 86 includes a jitter amount value output from the jitter accumulation determination unit 32 included in the test function unit 20, the test function unit 40, and the test function unit 60, and a jitter amount reference value 122 output from the control unit 70.
- the quality of the device under test 200 may be determined based on the above.
- the device jitter determination unit 86 may output the determination result 128 to the control unit 70.
- the test apparatus 100 detects the jitter amount of the response signal 102 with high accuracy by accumulating the selection data 109 in association with the phases of the plurality of strobe signals included in the plurality of multi-strobe signals 105. be able to. Furthermore, the test apparatus 100 can determine the quality of the device under test 200 in a short time by performing the test of the pins of the device under test 200 in parallel.
- test function units 22 data detection units, 24 selection units, 25 data width detection units, 26 window sequential determination units, 28 window accumulation determination units, 29 jitter detection units, 30 jitter sequential determination units, 32 jitter accumulation determination units 40 test function units, 60 test function units, 70 control units, 80 level comparators, 82 multi-strobe generation units, 83 expected value generation units, 84 device window determination units, 86 device jitter determination units, 100 test devices, 200 devices under test device
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Abstract
Description
特許文献1 WO2007/091413号
Claims (15)
- 被試験デバイスを試験する試験装置であって、
予め定められた時間間隔で配置された複数のストローブを含むマルチストローブを、予め定められた試験周期毎に発生するマルチストローブ発生部と、
前記被試験デバイスが出力する応答信号の論理値を、それぞれの前記ストローブに応じて検出するデータ検出部と、
前記データ検出部が出力する論理値の各変化点に基づいて、前記応答信号の論理値が予め定められた期待値と一致する期間を示すデータ幅を検出するデータ幅検出部と
を備える試験装置。 - 前記マルチストローブ発生部は、複数の前記ストローブが、前記応答信号の周期より長い期間に渡って配置されるように、それぞれの前記マルチストローブを発生する
請求項1に記載の試験装置。 - 前記データ幅検出部は、1つの前記マルチストローブにおいて、前記応答信号の論理値が前記期待値に変化する第1変化点と、前記応答信号の論理値が前記期待値から変化する第2変化点とを検出した場合に、前記第1変化点および前記第2変化点の各位置に基づいて、前記データ幅を検出する
請求項1または2に記載の試験装置。 - 前記データ幅検出部は、1つの前記マルチストローブにおいて、前記応答信号の論理値が前記期待値に変化する第1変化点の後に、前記応答信号の論理値が前記期待値から変化する第2変化点を検出した場合に、前記第1変化点および前記第2変化点の相対位置差に基づいて、前記データ幅を検出する
請求項1から3のいずれか一項に記載の試験装置。 - 前記マルチストローブ発生部は、1つの前記マルチストローブにおいて、前記応答信号の論理値が前記期待値に変化する第1変化点の後に、前記応答信号の論理値が前記期待値から変化する第2変化点を検出しない場合に、前記応答信号の論理値が前記期待値に変化する第1変化点の後に、前記応答信号の論理値が前記期待値から変化する第2変化点が検出されるまで、前記マルチストローブの位置を調整する
請求項1から4のいずれか一項に記載の試験装置。 - 前記データ幅検出部は、1つの前記マルチストローブにおいて、前記応答信号の論理値が前記期待値から変化する第2変化点の前に、前記応答信号の論理値が前記期待値に変化する第1変化点を検出しない場合に、前記マルチストローブの始点から前記第2変化点までの期間に基づいて前記データ幅を検出する
請求項1から4のいずれか一項に記載の試験装置。 - 前記データ幅検出部は、1つの前記マルチストローブにおいて、前記応答信号の論理値が前記期待値に変化する第1変化点の後に、前記応答信号の論理値が前記期待値から変化する第2変化点を検出しない場合に、前記第1変化点から前記マルチストローブの終点までの期間に基づいて前記データ幅を検出する
請求項6に記載の試験装置。 - 前記マルチストローブ発生部は、1つの前記マルチストローブにおいて、前記応答信号の論理値が前記期待値から変化する第2変化点の前に、前記応答信号の論理値が前記期待値に変化する第1変化点を検出しない場合に、前記データ幅検出部が検出した前記データ幅が予め定められた許容範囲外となることを条件に、前記マルチストローブの位相を早くする
請求項6に記載の試験装置。 - 前記マルチストローブ発生部は、1つの前記マルチストローブにおいて、前記応答信号の論理値が前記期待値に変化する第1変化点の後に、前記応答信号の論理値が前記期待値から変化する第2変化点を検出しない場合に、前記データ幅検出部が検出した前記データ幅が予め定められた許容範囲外となることを条件に、前記マルチストローブの位相を遅くする
請求項7に記載の試験装置。 - 前記データ幅検出部は、
1つの前記マルチストローブ毎に、検出した前記データ幅が予め定められた許容範囲内か否かを示すウィンドウ逐次判定結果を出力するウィンドウ逐次判定部と、
複数の前記マルチストローブにおいて検出された、それぞれの前記第1変化点のうち最も位相の遅いものと、それぞれの前記第2変化点のうち最も位相の早いものとの相対位相差が、予め定められた許容範囲内か否かを示すウィンドウ蓄積判定結果を出力するウィンドウ蓄積判定部と
を有する請求項3から9のいずれか一項に記載の試験装置。 - 前記試験装置は、前記被試験デバイスの複数のピンを並行して試験し、
前記データ幅検出部は、前記被試験デバイスのピン毎に設けられ、
前記試験装置は、それぞれの前記データ幅検出部における判定結果に基づいて、前記被試験デバイスの良否を判定するデバイスウィンドウ判定部を更に備える
請求項1から10のいずれか一項に記載の試験装置。 - それぞれの前記マルチストローブにおいて、前記第1変化点または前記第2変化点のいずれかの変化点のジッタを検出するジッタ検出部を更に備える
請求項3に記載の試験装置。 - 前記ジッタ検出部は、
1つの前記マルチストローブ毎に、検出した前記ジッタが予め定められた許容範囲内か否かを示すジッタ逐次判定結果を出力するジッタ逐次判定部と、
複数の前記マルチストローブにおいて検出された変化点の位相のうち、最も遅い位相と、最も早い位相との相対位相差が、予め定められた許容範囲内か否かを示すジッタ蓄積判定結果を出力するジッタ蓄積判定部と
を有する請求項12に記載の試験装置。 - 前記試験装置は、前記被試験デバイスの複数のピンを並行して試験し、
前記ジッタ検出部は、前記被試験デバイスのピン毎に設けられ、
前記試験装置は、それぞれの前記ジッタ検出部における判定結果に基づいて、前記被試験デバイスの良否を判定するデバイスジッタ判定部を更に備える
請求項12または13に記載の試験装置。 - 被試験デバイスを試験する試験方法であって、
予め定められた時間間隔で配置された複数のストローブを含むマルチストローブを、予め定められた試験周期毎に発生するマルチストローブ発生段階と、
前記被試験デバイスが出力する応答信号の論理値を、それぞれの前記ストローブに応じて検出するデータ検出段階と、
前記データ検出段階で検出した論理値の各変化点に基づいて、前記応答信号の論理値が予め定められた期待値と一致する期間を示すデータ幅を検出するデータ幅検出段階と
を備える試験方法。
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| US20130076425A1 (en) * | 2010-06-08 | 2013-03-28 | Kyung Suk Oh | Integrated circuit device timing calibration |
| CN102262210B (zh) * | 2011-04-20 | 2013-03-20 | 哈尔滨工业大学 | 基于随机子空间与多储备池集成分类的模拟电路故障诊断方法 |
| CN102262198B (zh) * | 2011-04-20 | 2013-02-27 | 哈尔滨工业大学 | 基于回声状态网络同步优化的模拟电路故障诊断方法 |
| WO2017130983A1 (ja) * | 2016-01-25 | 2017-08-03 | アイシン・エィ・ダブリュ株式会社 | メモリコントローラ |
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| TWI238256B (en) * | 2000-01-18 | 2005-08-21 | Advantest Corp | Testing method for semiconductor device and its equipment |
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| JP4152710B2 (ja) * | 2002-10-01 | 2008-09-17 | 株式会社アドバンテスト | ジッタ測定装置、及び試験装置 |
| US7398169B2 (en) * | 2006-02-27 | 2008-07-08 | Advantest Corporation | Measuring apparatus, measuring method, testing apparatus, testing method, and electronics device |
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| WO2007091413A1 (ja) * | 2006-02-10 | 2007-08-16 | Advantest Corporation | 変化点検出回路、ジッタ測定装置、及び試験装置 |
| WO2008136301A1 (ja) * | 2007-04-27 | 2008-11-13 | Advantest Corporation | 試験装置および試験方法 |
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| JPWO2010092800A1 (ja) | 2012-08-16 |
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