WO2006001078A1 - 半導体集積回路装置 - Google Patents
半導体集積回路装置 Download PDFInfo
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- WO2006001078A1 WO2006001078A1 PCT/JP2004/009461 JP2004009461W WO2006001078A1 WO 2006001078 A1 WO2006001078 A1 WO 2006001078A1 JP 2004009461 W JP2004009461 W JP 2004009461W WO 2006001078 A1 WO2006001078 A1 WO 2006001078A1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C8/00—Arrangements for selecting an address in a digital store
- G11C8/10—Decoders
Definitions
- the present invention relates to a semiconductor integrated circuit device, and more particularly to a technology that is effective when used for a device equipped with a static RAM (random access memory) that requires high-speed operation.
- static RAM random access memory
- the inventors of the present application examined reading the data written as a function of the high-speed S R AM M in the same cycle.
- a semiconductor memory device in which a write operation is preferentially read in a SRAM having a single port such as a write port and a read port, Japanese Patent Laid-Open No. Hei 10-50 No. 0 61 and Japanese Patent Laid-Open No. 2 0 0 1-3 1 9 4 7 7.
- FIG. 10 there is provided a selector for selecting one of the output signal of the sense amplifier that senses the write data held in the input and latch and the read data from the memory cell. And output through the output latch.
- the selector operates to create a write data output path for selecting a signal from the input latch and to form a memory cell data output path for selecting an output signal of memory cell ⁇ read switch ⁇ sense amplifier. Work and ⁇ ⁇ .
- the input latch is operated as a write operation to the memory cell.
- the write signal is written by forming a write data output path that selects the output signal of the input latch by the selector while performing the write operation by the path of the write driver ⁇ Rice switch-memory cell. Data can be read out in the same cycle.
- an object of the present invention is to provide a semiconductor integrated circuit device including a semiconductor memory circuit that can read write data in the same cycle without delaying the original read operation with a simple configuration. is there.
- FIG. 1 is a schematic block diagram of a principal part showing an embodiment of a semiconductor memory circuit according to the present invention.
- FIG. 2 is a block diagram for explaining the data flow in the semiconductor memory circuit of FIG.
- FIG. 3 is a timing chart for explaining an example of the read operation of the semiconductor memory circuit of FIG.
- FIG. 4 is a timing diagram for explaining an example of the operation of the semiconductor memory circuit of FIG.
- FIG. 5 is a block diagram for explaining a system using the semiconductor memory circuit of FIG.
- FIG. 6 is a schematic block diagram showing another embodiment of the semiconductor memory circuit according to the present invention.
- FIG. 7 is a timing chart for explaining an example of the memory operation by the write buffer method of FIG.
- FIG. 8 is a block diagram showing an embodiment of a semiconductor integrated circuit device using the semiconductor memory circuit according to the present invention.
- FIG. 9 is a block diagram showing one embodiment of the UR AM of FIG. 8, and FIG. 10 is a block diagram of a semiconductor memory circuit studied prior to the present invention.
- FIG. 11 is a timing chart for explaining an example of the operation of the semiconductor memory circuit of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows a schematic block diagram of a main part of an embodiment of a semiconductor memory circuit according to the present invention.
- two word lines WL 0 and WL 1 a pair of complementary bit lines BLB and BLT, and two memory cells MC 0 and MC 1 provided at the intersections thereof, the above-mentioned node line and bit line
- the address selection circuit PRI a data input path as a write path to the memory cell and a data output path as a read path from the memory cell are exemplarily shown as representatives.
- the memory cell MC O (MC 1) includes a CMOS latch circuit in which the input and output of the CMOS inverter circuit are cross-connected, a pair of input / output nodes of the CMOS latch circuit, and a complementary bit line BLB. And an M 0 SFET for selecting an address provided between BLT and BLT. The gate of the address selection M0SFET is connected to the word line WL O (WL 1).
- an address buffer that receives an address signal supplied from the end address terminal, and an address that decodes an address signal fetched through the address buffer and forms a selection signal for one word line. It is composed of a decoder, a node driver for driving the intermediate line by the selection signal, and the like.
- the data input path is supplied from an external terminal.
- the input circuit DIB that receives the input data (Db f), the write amplifier (or write driver) WA that receives the output signal of the input circuit DIB and forms the write signal applied to the bit lines BLB and BLT, and the write circuit Switch WSW.
- the above-described output path includes an output circuit that forms a read switch RS that connects the bit lines BLB and BLT to the sense amplifier SA, and output data (Q) that outputs the output signal of the sense amplifier SA from an external terminal. Consists of DOB. The above light amp.
- the output terminal of WA is connected to the write line WDL and is selectively connected to multiple pairs of bit lines via the write switch WSW selected by the Y address.
- the input terminal of the sense amplifier SA is connected to the lead wire SAL, and is selectively connected to a plurality of pairs of bit lines via the read switch RSW selected by the YT dress.
- FIG. 1 is a block diagram for explaining the data flow in the semiconductor memory circuit of FIG.
- the input circuit D I B of FIG. 1 is shown as an input latch
- the write amplifier WA is shown as a write driver
- the output circuit DOB is shown as an output latch.
- the write latch output path performs input latch ⁇ write dry-write switch ⁇ write operation to memory cell and write switch ⁇ read switch ⁇ sense.
- the above write signal is output as output data through the path of the amplifier output latch.
- the memory cell data output path reads out the memory information of the memory cell selected by the word driver to the bit line as shown by the black arrow in the figure, and outputs it through the path of the read switch ⁇ sense amp 1 output latch. .
- the write operation is performed on the memory cell selected by the word driver.
- FIG. 3 explains the features of the present invention by comparing it with the configuration of FIG. 10 examined prior to the present invention.
- the timing diagram shown in FIG. As is clear from the comparison with the timing diagram shown in the figure, the selection time as shown in FIG. 10 is shown in the access time from the memory access to the output of the memory cell data in synchronization with the clock. Therefore, there is no selector delay, and the memory cell read operation can be performed at high speed.
- FIG. 4 shows a sunset diagram for explaining an example of the operation of the semiconductor memory circuit of FIG.
- (1) write operation write operation to memory cell
- (2) read operation read operation from memory cell
- white arrow indicated by the dotted arrows in Fig. 1 Each cycle 1, 2 and 3 of the write / read operation is shown as an example.
- the address signal AO and the write data D0 are input in synchronization with the clock CLK, and the corresponding word line WL0 is selected (ON).
- a potential difference is generated in the bit line BLB / BLT to which the memory cell MC is connected, corresponding to the stored information of the memory cell MC.
- the write line (write amplifier) WA changes the bit line BLB / BLT in response to the above-described write-in D0.
- the write data DO is written into the memory cell MC.
- bit lines BLB and BLT are set to full amplitude as shown by the power supply voltages VDD and VSS (GN D). There is a need.
- the write voltages of the bit lines BLB and BLT are omitted in FIG. 1, but are supported by a precharge (light recovery) circuit provided on the complementary bit lines BLB and BLT. It is precharged (equalized) in the second half of cycle 1.
- the address signal A1 is input in synchronization with the clock CLK and the corresponding lead wire WL1 is set to the selected state (ON).
- a potential difference is generated in the bit line BL B / BLT to which the memory cell MC is connected corresponding to the stored information of the memory cell MC.
- a difference voltage corresponding to the potential difference of the bit line BLB / BLT is generated on the sense line SAL, and is amplified by the operation (ON) of the sense amplifier SA.
- This amplified signal is output as output data Q 1 through the output circuit in the second half of the cycle.
- the read voltages of the bit lines BLB and BLT and the sense line SAL are precharged (equalized) in the second half of the cycle 2 by the precharge circuit as described above.
- address signal A 2 and write data D are input in synchronization with clock CLK, and the corresponding word line, WL 0 is selected for convenience in this figure ( turn on.
- a potential difference is temporarily generated in the bit lines 8 and 8/8 to which the memory cell MC is connected, corresponding to the stored information of the memory cell MC.
- the light duraino (write amplifier) WA changes the bit line BLB / BLT corresponding to the write data D2. Let As a result, the write data D 2 is written into the memory cell MC.
- the read switch RSW is also turned on, and the write signal of the bit line BLB / BLT formed by the write driver (write amplifier) WA is transmitted to the sense line SAL. Therefore, the write signal is amplified by the operation (ON) of the sense amplifier SA and output as output data Q 2 through the output circuit.
- Read bit lines BLB and BLT and sense line SAL The discharge voltage is precharged (raised) in the second half of cycle 3 by the precharge circuit as described above. In this way, it is possible to perform writing and reading during the same cycle without providing a selector as described above.
- FIG. 5 shows a block diagram of an embodiment of a system using the semiconductor memory circuit of FIG.
- the memory circuit URAM using a general semiconductor memory circuit and the input and output terminals of the third module are connected to the data buses A to E. Is done.
- the de-evening bus A-C is a Latde-evening bus, and one of the light-de-nighting of A-C is selected by a selector (not shown) provided at the UR AM and the third module's de-evening input terminal. De evening from the bus is written.
- the data output terminal of the memory circuit U RAM is connected to the read / write bus D, and the data output terminal of the third module is connected to the read / write bus E.
- the memory circuit URAM using the semiconductor memory circuit according to the present invention as described above, and the data input terminal and the output terminal of the third module are connected to the data bus A ⁇ .
- the above-described (3) write / read function of the memory circuit URAM is used as a data transfer function.
- the data input terminal of the third module is not connected to the data bus A to C as shown in (A), but is connected to the read data bus D to which the data output terminal of the memory circuit URAM is connected. Is done.
- the memory circuit UR AM is caused to perform the (3) write / read operation
- the memory circuit UR AM is caused to perform the write operation
- the data is transmitted via the read data bus D.
- FIG. 6 shows a schematic block diagram of an embodiment of the semiconductor memory circuit according to the present invention.
- the semiconductor memory circuit of this embodiment is mounted on one semiconductor integrated circuit device together with a microprocessor core, and the semiconductor memory circuit URAM adopts a line buffer system so as to increase the operating frequency of the product. Is.
- the write buffer method is that once the data and instructions are written to the URAM from the microprocessor core CPU (+ FPU) to the URAM, the data and instructions are not flipped. Fluff. It is stored in the circuit F / F and the write control to the memory pine is performed in the subsequent cycles.
- the static memory cell uses the CM 0 S latch circuit as a memory circuit as described above, in order to invert the memory state, the bit lines BLB and BLT are connected to the power supply voltage VDD and the circuit ground potential. It is necessary to make GND full amplitude.
- the bit lines BLB and BLT that have been fully amplified in this way need to be returned to the precharge voltage for the next memory cycle.
- a small voltage difference between the bit lines BLB and BLT is amplified by the sense amplifier SA, so that the potential change of the bit lines BLB and BLT is small and based on that.
- the precharge time to return may be short. For this reason, in a semiconductor memory circuit using a static memory cell, read operation from the memory cell is performed. The time required for the operation is generally longer than the time required for the write operation to the memory cell.
- the first operation for temporarily storing the instruction and the instruction in the flip-flop circuit F / F and the second operation for writing to the memory cell based on the data stored in the flip-flop circuit FF are performed.
- the memory cycle is set according to the time required for the read operation from the memory cell, so that the operating frequency of the bus cycle is improved. be able to.
- the read operation is performed for the same address after the write operation
- the write operation stores data and instructions once in the flip-flop circuit F / F as described above in that cycle. Since only the first operation is performed, if the memory cell is selected by the above read operation and the read operation is performed, the data before writing is read out.
- the address address comparison circuit AC compares the read address signal of the flip-flop circuit F / F that captures the address with the write address signal A bf held in the flip-flop circuit F / F of the write buffer. If they match, the write data D bf held in the flip-flop circuit F / F of the write buffer is output as a read signal from the memory pine by the signal path shown by the dotted line in FIG.
- a selector is shown as a selector.
- the write switch and the read switch are controlled to be turned on, and the URAM (2) is controlled.
- the read path from the memory memory the read path from the write buffer shown in the form of a selector, that is, corresponding to the UR AM (3)
- a read path from the write buffer is formed as indicated by a dotted line, and the write operation to the memory cell corresponding to the second operation of the write operation and the bit lines BLB and BLT changed by the write operation are performed.
- the voltage difference is amplified by a sense amplifier and output as a read path from the write buffer as shown in the figure.
- FIG. 7 is a timing chart for explaining an example of the memory operation by the write buffer system of FIG.
- the read cycle transmits the address signal to the U RAM without going through the write buffer as in the read 1 cycle. Then, in the latter half of the same cycle, the read data Q n corresponding to the address An is output.
- the write enable is set to high level, and the write buffer enable signal bf — en causes the address signal A O, input data D O, and write signal WE to be called a write buffer.
- the write buffer enable signal bf — en causes the address signal A O, input data D O, and write signal WE to be called a write buffer.
- the address signal A bf, data D bf, and write signal WE bf stored in the write buffer are written to the memory pin, and at the same time, the address A 1, corresponding to write 2, Data D1 and write signal WE are stored in the flip-flop circuit F / F of the write buffer, respectively.
- the output data Qn and Q0 are regarded as unnecessary data. If the output circuit is set to high impedance, such output data will not be output.
- the write enable is set to the low level and the write enable buffer signal bf-en is also set to the low level, so the address signal A 2 of the read 2 is supplied to the UR AM as the address signal A.
- output signal Q2 is output in the second half of the cycle.
- the second operation corresponding to the write 2 is waited in the lead 2 cycle.
- the corresponding address A 2, data D 2 and write signal WE are held in the write buffer.
- a read operation is instructed for address A 2 corresponding to write 2 above.
- the address comparison circuit AC detects this, the address A 1 and the data D 2 held in the write buffer and the write signal WE cause a write operation to the memory ⁇ of the RAM.
- the read switch is turned on by the address match detection signal, the sense amplifier SA amplifies the write voltage difference appearing on the bit lines BLB and BLT of the memory mat, and the read data Q 1 is used as the read data Q 1. It is output in the second half of the cycle.
- the bit lines B LB and BLT are transmitted to the sense line SAL connected to the sense amplifier via the read switch RSW.
- the data on the sense line SAL is amplified by the activation of the sense amplifier SA and output to the outside through an output circuit composed of an output latch, an output buffer, and the like. Therefore, the output data Q 0 corresponding to the input data D 0 is output in the write 2 cycle, but it is treated as unnecessary data.
- the write operation to the memory cell corresponding to write 2 that has been waiting waits for an access request with the same address as the end address stored in the write buffer in the read 3 cycle.
- the write signal WE is at a high level due to the match signal from the address comparison circuit AC
- the write data Db f received from the write buffer is input to the input circuit DIB ⁇ driver ⁇ ⁇ driver (light amplifier) WA ⁇ Write switch WSW—Writing to memory cell MC selected by address via bit lines BLB and BLT.
- bit lines BLB and BLT are transmitted to the sense line S A L via the read switch RS W. Even if the data read from the selected memory cell MC has already propagated to the sense line SAL, the write driver WA has high driving capability, and the selected memory cell MC is also rewritten, so the write to the sense line SAL is possible. Day evening D 1 is transmitted. Since the sense amplifier S A amplifies the data D 1 of the sense line SAL, the write data Q 1 is output to the outside.
- the circuit configuration of these URAMs is common for semiconductor memory circuits, and no additional circuit is required to realize this function. That is, the first The area does not increase as in the case of providing a selector as shown in FIG. Also
- selection logic select and output the data read from memory pine and write data, so there is no delay in the read access time there. Does not occur.
- FIG. 8 is a block diagram showing one embodiment of a semiconductor integrated circuit device using the semiconductor memory circuit according to the present invention.
- the semiconductor memory circuit is used as a user memory URAM.
- This URA M and controller MEMC are combined.
- the controller MEMC includes the write buffer address comparison circuit AC, and performs memory access by a write buffer method using URAM as shown in FIG.
- Cache C a c he is a module connected to F BUS (or MBUS) and I BUS, and consists of a cache controller CCN and cache memory.
- FBUS is a command fetch bus
- MBUS is a data access bus.
- two caches C a c h e are installed for command and data access.
- CPU + FPU Central Processing Unit + Floating Point Arithmetic Unit
- Flash memory F 1 ash and control unit ⁇ CB SC are representative of memory for MBUS and I BUS. Is provided. This control unit CB SC controls access to the user memory URAM and the cache C a c he. Flash memory F 1 a s h.
- the bus transfer function using the write / read operation of URAM as described above is that the MBUS write data bus mdb—w performs the write operation from w to URAM and the data is transferred from the read bus mdb—r to FP. It can be transmitted in one cycle as an operation to U. This makes it possible to perform floating-point computations with FPU at high speed.
- the bus transfer function turns the read switch on unconditionally with a delay of one cycle. It can be realized by the function that performs the above write and read operations in the same cycle.
- the cache memory consists of an address array (or tag array) and a data array. Its basic operation is to receive a command / address from the F BUS, perform hit determination, and return data in the next cycle. I do. All control in the event of a cache miss is performed by the cache controller CCN.
- the cache memory address array and data output from the memory array are selected by the cache controller CCN as fetched data from the IBUS via the CCN for each of FBUS and MBUS.
- C CN controls all operations during cache fill / write back. ⁇
- Control unit ⁇ CB SC controls access to user memory URAM, cache C ac he. Flash memory F 1 ash, and is not particularly limited, but bus fdb, mdb_r is the control unit CBS C. Memory URAM, cache C ac he, flash memory F 1 ash is a shared output bus. Rather than tri-state controlling the output buffer of each module, the output data of the module selected as needed is treated as an effective device using AND logic and the common bus f db, mdb—renders (outputs) to r.
- FIG. 9 shows a block diagram of one embodiment of the URAM of FIG. .
- the URAM in this embodiment is composed of four pages and is not particularly limited, but is 32 KB RAM per page.
- the output section has a data selector from each page RAM for FBUS, MB US, and IBUS. Access from FBUS, MBUS, and IBUS is possible for each page. However, when accessing the same page from multiple buses, there is a conflict and one of the nodal accesses is awaited. Even if there are multiple nose accesses, there is no contention when accessing different pages.
- the write switch is omitted, a write amplifier or write driver with a tristate output function is provided on each bit line of the memory mat, and the write amplifier or write driver is connected to the bit line selection signal.
- the write operation timing signal may be selectively activated.
- the input data Db f held in the write buffer is supplied up to the input to the URAM write driver or write amplifier during the first operation period.
- the input data Db f is supplied to the URAM write driver or write amplifier.
- the write switch is turned on or each bit of the memory pine as described above.
- a write amplifier provided with a tri-state output function provided in the data line may be selectively activated by a bit line selection signal and a write operation timing signal.
- the sense amplifier is also provided for each bit line, the output terminals are coupled by wired OR logic, and only the sense amplifier corresponding to the selected bit line is put into an operating state, and the output signal is output. May be output through an output circuit.
- the present invention can be widely used not only for semiconductor memory circuits such as high-speed static RAMs mounted on semiconductor integrated circuit devices, but also for semiconductor integrated circuit devices that constitute one semiconductor memory device by itself. it can.
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- Static Random-Access Memory (AREA)
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Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006527627A JPWO2006001078A1 (ja) | 2004-06-28 | 2004-06-28 | 半導体集積回路装置 |
| PCT/JP2004/009461 WO2006001078A1 (ja) | 2004-06-28 | 2004-06-28 | 半導体集積回路装置 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2004/009461 WO2006001078A1 (ja) | 2004-06-28 | 2004-06-28 | 半導体集積回路装置 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2006001078A1 true WO2006001078A1 (ja) | 2006-01-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2004/009461 Ceased WO2006001078A1 (ja) | 2004-06-28 | 2004-06-28 | 半導体集積回路装置 |
Country Status (2)
| Country | Link |
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| JP (1) | JPWO2006001078A1 (ja) |
| WO (1) | WO2006001078A1 (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114861898A (zh) * | 2020-11-02 | 2022-08-05 | 蒂普爱可斯有限公司 | 用于人工神经网络的存储器控制器、处理器以及系统 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02265094A (ja) * | 1989-04-06 | 1990-10-29 | Matsushita Electron Corp | 半導体メモリ装置 |
| JPH03292695A (ja) * | 1990-04-10 | 1991-12-24 | Mitsubishi Electric Corp | デュアルポートメモリ |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4090165B2 (ja) * | 1999-11-22 | 2008-05-28 | 富士通株式会社 | 半導体記憶装置 |
-
2004
- 2004-06-28 WO PCT/JP2004/009461 patent/WO2006001078A1/ja not_active Ceased
- 2004-06-28 JP JP2006527627A patent/JPWO2006001078A1/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02265094A (ja) * | 1989-04-06 | 1990-10-29 | Matsushita Electron Corp | 半導体メモリ装置 |
| JPH03292695A (ja) * | 1990-04-10 | 1991-12-24 | Mitsubishi Electric Corp | デュアルポートメモリ |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114861898A (zh) * | 2020-11-02 | 2022-08-05 | 蒂普爱可斯有限公司 | 用于人工神经网络的存储器控制器、处理器以及系统 |
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| Publication number | Publication date |
|---|---|
| JPWO2006001078A1 (ja) | 2008-04-17 |
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