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FOXBORO P0916CA Channel relay module

The MVME167 dual-port RAM feature makes the shared RAM available to remote processors as well as to the local processor. This can be done by either of the following two methods: ❏ The Multiprocessor Control Register (MPCR) Method ❏ The Global Control and Status Register (GCSR) Method Either method can be enabled/disabled by the ENV command as its Remote Start Switch Method (refer to Appendix A).

167Bug returns an error code if an attempted network operation is unsuccessfu

Multiprocessor Control Register (MPCR) Method

A remote processor can initiate program execution in the local MVME167 dual-port RAM by issuing a remote GO command using the Multiprocessor Control Register (MPCR). The MPCR, located at shared RAM location of $800 offset from the base address the debugger loads it at, contains one of two longwords used to control communication between processors.The status codes stored in the MPCR are of two types: ❏ Status returned (from the 167Bug) ❏ Command set by the bus master (job requested by some processor)

Multiprocessor Address Register (MPAR)

The Multiprocessor Address Register (MPAR), located in shared RAM location of $804 offset from the base address the debugger loads it at, contains the second of two longwords used to control communication between processors. The MPAR contents specify the physical address (as viewed from the local processor) at which execution for this processor is to begin if the MPCR contains a G or B.

1. At powerup, the debug monitor self-test routines initialize RAM, including the memory locations used for multiprocessor support ($800 through $807). 2. The MPCR contains $00 at powerup, indicating that initialization is not yet complete.

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