Granted Patent B2

US 7,254,659 · App. 10/899,611 · Granted Aug 7, 2007

Abstract

Claims (36)

1. A method of performing a VMEbus split-read transaction, comprising:

providing a master VMEbus module coupled to a slave VMEbus module through a VMEbus network;

the master VMEbus module initiating a VMEbus split-read transaction request in a VME address encoding phase to the slave VMEbus module, wherein the VMEbus split-read transaction request comprises a return address for the master VMEbus module in the VME address encoding phase, and wherein the VMEbus split-read transaction request requests a set of data;

the master VMEbus module releasing the VMEbus network;

the slave VMEbus module acquiring the VMEbus network;

the slave VMEbus module placing the set of data on the VMEbus network, wherein the set of data comprises the return address for the master VMEbus module; and

the master VMEbus module retrieving the set of data.

2. The method of claim 1 , further comprising the slave VMEbus module acknowledging the VMEbus split-read transaction request.

3. The method of claim 1 , wherein initiating the VMEbus split-read transaction request comprises providing a split-read transaction code to the slave VMEbus module.

4. The method of claim 3 , wherein the split-read transaction code is an XAM code.

5. The method of claim 1 , further comprising after releasing the VMEbus network, the VMEbus network performing other VMEbus network activity prior to the slave VMEbus module acquiring the VMEbus network.

6. The method of claim 1 , wherein initiating the VMEbus split-read transaction request initiates a split-read timer period at the master VMEbus module.

7. The method of claim 6 , wherein if the slave VMEbus module fails to acknowledge the VMEbus split-read transaction request prior to expiration of the split-read timer period, the VMEbus split-read transaction request expires.

8. The method of claim 1 , wherein the return address is included in an address phase three of the VME address encoding phase.

9. The method of claim 1 , wherein a length code is included in an address phase two of the VME address encoding phase.

10. The method of claim 1 , further comprising the master VMEbus module recognizing the return address for the set of data placed on the VMEbus network by the slave VMEbus module.

11. The method of claim 1 , wherein the return address comprises a master VMEbus module memory address destination for the set of data requested.

12. The method of claim 11 , wherein the master VMEbus module retrieving the set of data comprises the master VMEbus module writing the set of data to the master VMEbus module memory address destination.

13. A computer-readable medium containing computer instructions for instructing a processor to perform a VMEbus split-read transaction, the instructions comprising:

providing a master VMEbus module coupled to a slave VMEbus module through a VMEbus network;

the master VMEbus module initiating a VMEbus split-read transaction request in a VME address encoding phase to the slave VMEbus module, wherein the VMEbus split-read transaction request comprises a return address for the master VMEbus module in the VME address encoding phase, and wherein the VMEbus split-read transaction request requests a set of data;

the master VMEbus module releasing the VMEbus network;

the slave VMEbus module acquiring the VMEbus network;

the slave VMEbus module placing the set of data on the VMEbus network, wherein the set of data comprises the return address for the master VMEbus module; and

the master VMEbus module retrieving the set of data.

14. The computer-readable medium of claim 13 , further comprising the slave VMEbus module acknowledging the VMEbus split-read transaction request.

15. The computer-readable medium of claim 13 , wherein initiating the VMEbus split-read transaction request comprises providing a split-read transaction code to the slave VMEbus module.

16. The computer-readable medium of claim 15 , wherein the split-read transaction code is an XAM code.

17. The computer-readable medium of claim 13 , further comprising after releasing the VMEbus network, the VMEbus network performing other VMEbus network activity prior to the slave VMEbus module acquiring the VMEbus network.

18. The computer-readable medium of claim 13 , wherein initiating the VMEbus split-read transaction request initiates a split-read timer period at the master VMEbus module.

19. The computer-readable medium of claim 18 , wherein if the slave VMEbus module fails to acknowledge the VMEbus split-read transaction request prior to expiration of the split-read timer period, the VMEbus split-read transaction request expires.

20. The computer-readable medium of claim 13 , wherein the return address is included in an address phase three of the VME address encoding phase.

21. The computer-readable medium of claim 13 , wherein a length code is included in an address phase two of the VME address encoding phase.

22. The computer-readable medium of claim 13 , further comprising the master VMEbus module recognizing the return address for the set of data placed on the VMEbus network by the slave VMEbus module.

23. The computer-readable medium of claim 13 , wherein the return address comprises a master VMEbus module memory address destination for the set of data requested.

24. The computer-readable medium of claim 23 , wherein the master VMEbus module retrieving the set of data comprises the master VMEbus module writing the set of data to the master VMEbus module memory address destination.

Assignments (11)