CN1912641A - Method and system for detecting single-plate on position - Google Patents

Abstract

The present invention provides a single board in-position detection method, comprising the steps: the network management or the test terminal sends an instruction to the test bus controller TBC to drive the test bus controller TBC to detect whether the single board in the system is in place; the test bus controller TBC passes through the back The board boundary scan test system bus sends a broadcast message; after receiving the broadcast message, the addressable scan port ASP replies a response message; judges whether the board is in place according to the content of the response message. The present invention also provides a single board in-position detection system, including a TBC arranged on the main control board and an ASP arranged on the service board, and communication is realized through the JTAG bus on the backboard; the ASP replies a response message according to the broadcast information sent by the TBC, The TBC completes the board presence detection according to the response message. By implementing the present invention, the commonly used boundary scanning technology is used to realize the in-position detection of the single board, reduce the number of backplane buses, and realize a reliable single-board in-position detection mechanism.

Description

A single board in-position detection method and system

technical field

The invention relates to the technical field of veneer detection, in particular to a veneer in-position detection method and system.

Background technique

In the control system, the interconnection between boards generally adopts a plug-in structure, which is usually composed of a backplane and multiple boards. The system often needs to know which slots have single boards inserted and which slots do not have single boards. board, which is the so-called single board presence detection, or single board roll call. According to the implementation method in the prior art, as shown in FIG. 1 , an presence detection signal line is connected from the main control board to the service board, and whether the single board is in position is detected according to the level of the signal line.

And the shortcoming of prior art is:

1. As many service boards as there are in the system need to design as many in-position detection signal lines. The presence detection signal lines are connected to the main control board and the backplane slots of each service board through the backplane. If there are many slots in the backplane , it is necessary to add more signal lines for in-position detection in the backplane bus, so the number of backplane buses is large;

2. If a hardware failure occurs on the presence detection signal line, it cannot be used for board presence detection.

Contents of the invention

The object of the present invention is to provide a single board presence detection method and system, which can realize the single board presence detection by using the widely used boundary scan technology, reduce the number of backplane buses, and realize a reliable single board presence detection mechanism.

In order to realize the purpose of the present invention, the present invention provides a kind of veneer presence detection method, comprises steps:

(A) The test bus controller TBC sends a broadcast message through the backplane boundary scan test system bus;

(B) After the addressable scanning port ASP receives the broadcast message, it replies with a response message;

(C) Judging whether the board is in place according to the content of the response message.

Before the step (A), there is also a step of: sending an instruction to the test bus controller TBC, driving the test bus controller TBC to detect whether the single board in the system is in place.

The step (A) specifically includes: the test bus controller TBC selects a slot to be tested, and sends a broadcast message through the backplane boundary scan test system bus according to the slot ID.

The step (B) further includes a step: the test bus controller TBC reclaims the response message through the backplane boundary scan test system bus.

The response message in the step (B) is the slot ID for accessing the addressable scan port ASP.

Described step (c) specifically comprises the steps:

(C1) The test bus controller TBC compares the slot ID in the reclaimed response message with the slot ID based on sending the broadcast message, if the slot ID is consistent, execute step (C2), otherwise execute step (C3) ;

(C2) Judging and reporting the existence of the single board in the slot of the network management or test terminal;

(C3) Judging and reporting that the single board in the slot of the network management or test terminal is not in place.

After the step (C), it also includes: querying whether all slots have been traversed: if all slots have been traversed, the board presence detection process ends; if not all slots have been traversed, then return to step (A).

The step (B) specifically includes: after receiving the broadcast message, the addressable scan port ASP replies with a response message according to the bus competition mechanism.

The response message in the step (B) is the slot ID for accessing the addressable scan port ASP.

The step (C) specifically includes: the test bus controller TBC reports the obtained slot ID data to the network management or the test terminal, and obtains the on-position information of the single board.

The response message in the step (B) is the chip ID of the addressable scan port ASP.

The step (C) specifically includes: the test bus controller TBC reports the obtained chip ID data of the addressable scan port ASP to the network management or test terminal, and obtains the information of the presence of the single board.

To realize the purpose of the present invention, the present invention also provides a single board in-position detection system, including a test bus controller TBC, which is located on the main control board; and an addressable scanning port ASP, which is located on the service board ; The test bus controller TBC realizes communication with the addressable scan port ASP through the boundary scan test system bus on the backplane;

The addressable scan port ASP is used to reply a response message according to the test bus controller TBC broadcast message;

The test bus controller TBC is used to judge whether the single board is in place according to the response message of the addressable scan port ASP;

Wherein the test bus controller TBC sends a broadcast message according to the slot ID.

The test bus controller TBC includes a response message recovery unit, a comparison unit and a judgment unit;

The response message recovery unit is used to recover the response message through the backplane boundary scan test system bus;

The comparing unit is configured to compare the recovered slot ID in the response message with the slot ID based on which the broadcast message is sent;

The judging unit is configured to judge and report whether the single board in the slot corresponding to the slot ID is in place according to the comparison result of the comparing unit.

The addressable scan port ASP replies with a response message according to the bus contention mechanism.

The response message includes a slot ID for accessing the addressable scan port ASP or a chip ID for the addressable scan port ASP.

Compared with prior art, the beneficial effect of the present invention is:

1. Through the boundary scan test system bus (1149.1 standard bus) to realize the function of on-site detection of the single board, this function can be added without adding any additional hardware to the products that have already realized the system level boundary scan test bus;

2. Only five boundary scan test buses are needed on the backplane. For products with more than 5 slots (general products have more than 5 slots), the number of backplane buses is reduced;

3. There is a handshake protocol in which the test bus controller sends a broadcast message-the addressable scan port replies with a response message, so the board presence detection is more reliable;

4. Both the slot identification and the backplane boundary scan test bus are connected to the service board from the backplane, so it can also be detected if the service board is not inserted tightly.

Description of drawings

FIG. 1 is a schematic diagram of a single board in-position detection in the prior art;

Fig. 2 is a method flow chart of Embodiment 1 of the veneer in-position detection method of the present invention;

Fig. 3 is a method flow chart of Embodiment 2 of the veneer in-position detection method of the present invention;

Fig. 4 is a method flow chart of Embodiment 3 of the veneer in-position detection method of the present invention;

Fig. 5 is a diagram of the single board in-position detection system of the present invention;

Fig. 6 is a model diagram of realizing single board presence detection through JTAG system bus in the present invention.

Detailed ways

JTAG (Joint Test Action Group, Joint Test Action Group) formulated the boundary scan test specification, and became the IEEE standard IEEE1149.1-90 in 1990, referred to as the JTAG standard. The JTAG standard has greatly promoted the development and wide application of boundary scan technology. . Now the application of boundary scan technology is becoming more and more common, the main applications are board interconnection test, FLASH loading, logic programming and so on. The application level also develops from the chip level to the circuit board level and then to the system level, and various application characteristics are continuously excavated. The following board presence detection method of the present invention uses the boundary scan technology to realize the board presence detection.

As shown in Figure 2, the veneer presence detection method of the present invention comprises steps:

Step 201, the network management or the test terminal sends an instruction to drive the TBC to detect whether the single board in the system is in place, and the TBC selects a slot to be detected;

Step 202, sending a broadcast message through the backplane JTAG system bus according to the slot ID;

Step 203, TBC reclaims the response message through the backplane JTAG system bus;

The service boards are respectively inserted in each slot, and the slot ID is connected to the ASP of the service board. After receiving the broadcast message, the ASP in the slot replies a response message to the TBC, and the content of the message is the slot ID of the ASP;

Step 204, TBC compares the slot ID in the recovered response message with the slot ID based on the broadcast message to determine whether the board is in place: if the slot IDs are consistent, go to step 205; if the slot IDs are inconsistent, Then go to step 206;

Step 205, judging and reporting the existence of the single board in the slot of the network management or test terminal;

Step 206, judging and reporting that the single board in the slot of the network management or test terminal is not in place;

Step 207, query whether all slots have been traversed, that is, whether all slots have been queried; if all slots have been traversed, the board presence detection process ends; if not all slots have been traversed, then return to step 202 and start A new process checks whether the board is in place.

In addition, the method of the present invention also allows other implementations to be implemented, as shown in Figure 3, including steps:

Step 301, the network management or the test terminal sends an instruction to drive the TBC to detect whether the single board in the system is in place, and the TBC sends a broadcast message through the backplane JTAG system bus;

Step 302, after the ASPs of each single board receive the broadcast message sent by the TBC, they sequentially send the slot IDs connected to it to the TBC by replying to the response message; when each ASP replies to the response message, it can The competition mechanism is used to send the slot IDs of all existing boards to the TBC under the condition that no data loss is guaranteed;

Step 303 , TBC reports the obtained slot ID data to the network management or testing terminal, because only the in-position board can reply a response message to inform its slot ID, then the network management or testing terminal can obtain the board presence information.

As shown in Figure 4, on the basis of the above-mentioned steps 301-303, the method of the present invention also allows implementation in the manner of verifying the chip ID of the ASP, including steps:

Step 401, the network management or the test terminal sends an instruction to drive the TBC to detect whether the single board in the system is in place, and the TBC sends a broadcast message through the backplane JTAG system bus;

Step 402, after the ASP of each single board receives the broadcast message sent by the TBC, it sends the chip ID of its ASP to the TBC in turn by replying to a response message; when each ASP replies to a response message, it can rely on the existing bus competition mechanism Send, under the condition that the data is not lost, the chip IDs of the ASPs of all the existing boards are sent to the TBC;

Step 403, TBC reports the acquired ASP's chip ID data to the network management or test terminal, because the ASP's chip ID is a unique identifier for each ASP, and only the in-position single board can reply a response message to inform it of the ASP's chip ID, Then the network management or test terminal can obtain the board presence information through the chip ID of the ASP.

As shown in FIG. 5 , it is a diagram of a board presence detection system of the present invention. The TBC (Test Bus Controller, test bus controller) chip is embedded on the main control board, the ASP (Addressable scan port, addressable scan port) chip is embedded on each service board, and the slot ID (identification) access ASP. TBC and ASP communicate through the JTAG system bus on the backplane. The JTAG system bus is composed of five JTAG signal lines, which are TMS (Test Mode Select Input, test mode selection input), TCK (TestClocK Input, test clock input), TDI (Test Data Input, test data input), TDO (Test Data Output, test data output) and TRST (Test Logic Reset, test logic reset).

The addressable scan port ASP is used to reply a response message according to the test bus controller TBC broadcast message; the test bus controller TBC is used to judge the single board according to the response message of the addressable scan port ASP Whether it is in place; wherein the test bus controller TBC sends a broadcast message according to the slot ID.

The test bus controller TBC includes a response message recovery unit, a comparison unit and a judgment unit; the response message recovery unit is used to recover the response message by the backplane boundary scan test system bus; the comparison unit is used to reclaim the response message The slot ID in the response message is compared with the slot ID based on sending the broadcast message; the judgment unit is used to judge and report whether the single board corresponding to the slot ID is in the slot according to the comparison result of the comparison unit bit.

The addressable scan port ASP replies with a response message according to the bus contention mechanism. The response message includes a slot ID for accessing the addressable scan port ASP or a chip ID for the addressable scan port ASP.

As shown in Figure 6, the network management or test terminal that detects the presence of the single board is connected to the main control board where the TBC is located through the network port or serial port. The network management or test terminal controls the TBC and ASP by sending test commands to the CPU of the main control board where the TBC is located. Communication to test and control memory to save the data in the test process; JTAG devices on each service board are connected into one or more JTAG chains, and TBC communicates with each ASP through the JTAG system bus (1149.1 standard bus) on the backplane to communicate.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention.

Claims (16)

1. A single board presence detection method, is characterized in that, comprises the following steps: (A) The test bus controller TBC sends a broadcast message through the backplane boundary scan test system bus; (B) After the addressable scanning port ASP receives the broadcast message, it replies with a response message; (C) Judging whether the board is in place according to the content of the response message. 2. The method according to claim 1, further comprising the step of: sending an instruction to the test bus controller TBC to drive the test bus controller TBC to detect whether the single board in the system is in place before the step (A). 3. the method for claim 1, is characterized in that: described step (A) is specially: test bus controller TBC selects a slot position to be detected, and test system bus by backplane boundary scan according to slot ID Send a broadcast message. 4. The method according to claim 1, characterized in that: said step (B) further comprises a step: the test bus controller TBC recovers the response message through the backplane boundary scan test system bus. 5. The method according to claim 4, wherein the response message in the step (B) includes a slot ID for accessing the addressable scan port ASP. 6. The method according to claim 5, characterized in that: said step (c) specifically comprises the steps of: (C1) The test bus controller TBC compares the slot ID in the reclaimed response message with the slot ID based on sending the broadcast message, if the slot ID is consistent, execute step (C2), otherwise execute step (C3) ; (C2) report that the single board in the slot of the network management or test terminal is in place; (C3) Report that the network management or test terminal does not have the single board in the slot. 7. The method according to claim 3, further comprising: after the step (C), querying whether all slots have been traversed: if all slots have been traversed, the single board presence detection process ends; if not traversed For all slots, return to step (A). 8. The method according to claim 1, wherein the step (B) specifically comprises: after the addressable scan port ASP receives the broadcast message, it replies with a response message according to the bus competition mechanism. 9. The method according to claim 8, wherein the response message in the step (B) includes a slot ID for accessing the addressable scan port ASP. 10. The method according to claim 9, wherein the step (C) is specifically: the test bus controller TBC reports the obtained slot ID data to the network management or test terminal, and obtains the on-position information of the single board . 11. The method according to claim 8, wherein the response message in the step (B) is the chip ID of the addressable scan port ASP. 12. The method according to claim 11, wherein the step (C) is specifically: the test bus controller TBC reports the chip ID data of the addressable scan port ASP obtained to the network management or test Terminal to obtain board presence information. 13. A single board in-position detection system, comprising a test bus controller TBC, which is located on the main control board; and an addressable scan port ASP, which is located on the service board; the test bus controller TBC passes through the back The boundary scan test system bus on the board realizes communication with the described addressable scanning port ASP; It is characterized in that: The addressable scan port ASP is used to reply a response message according to the broadcast message sent by the test bus controller TBC; The test bus controller TBC is used to judge whether the single board is in place according to the response message of the addressable scan port ASP; The test bus controller TBC is a broadcast message sent according to the slot ID. 14. system as claimed in claim 13, is characterized in that, described test bus controller TBC comprises response message recovery unit, comparison unit and judging unit; The response message recovery unit is used to recover the response message through the backplane boundary scan test system bus; The comparing unit is configured to compare the recovered slot ID in the response message with the slot ID based on which the broadcast message is sent; The judging unit is configured to judge and report whether the single board in the slot corresponding to the slot ID is in place according to the comparison result of the comparing unit. 15. The system according to claim 13, wherein the addressable scan port ASP replies a response message according to a bus contention mechanism. 16. The system according to claim 13, 14 or 15, wherein the response message includes a slot ID for accessing the addressable scan port ASP or a chip ID for the addressable scan port ASP .

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