Motorola MVME187 manual Multiprocessor Support, Network I/O Error Codes

Multiprocessor Support

Network I/O Error Codes

187Bug returns an error code if an attempted network operation is unsuccessful.

Multiprocessor Support

The MVME187 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).

Multiprocessor Control Register (MPCR) Method

A remote processor can initiate program execution in the local MVME187 dual-port RAM by issuing a remote GO command using the Multiprocessor Control Register (MPCR).

The MPCR, located at shared RAM location of $3000 offset from the base address the debugger loads it at, contains one of two words used to control communication between processors. The MPCR contents are organized as follows:

Base Address + $3000 * N/A N/A N/A (MPCR)

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