YASKAWA CACR-02-TE1K Programmable module

A remote processor can initiate program execution in the local MVME177 dual-port RAM by issuing a remote GO command using the VMEchip2 Global Control and Status Registers (GCSR). The remote GO command causes the following sequence: 

❏ Remote processor places the MVME177 execution address in general purpose registers 0 and 1 (GPCSR0 and GPCSR1) 

❏ Remote processor sets bit 8 (SIG0) of the VMEchip2 LM/SIG register 

❏ MVME177 installs breakpoints and begins execution The result is identical to the MPCR method (with status code B) described in the previous section.

The GCSR registers are accessed in the VMEbus short I/O space.

 Each general purpose register is two bytes wide, occurring at an even address. The general purpose register number 0 is at an offset of $8 (local bus) or $4 (VMEbus) from the start of the GCSR registers. The local bus base address for the GCSR is $FFF40100. The VMEbus base address for the GCSR depends on the group select value and the board select value programmed in the Local Control and Status Registers (LCSR) of the MVME177. The execution address is formed by reading the GCSR general purpose registers in the following manner:used as the lower 16 bits of the address

Diagnostic Facilities 

The 177Bug hardware diagnostics are intended for testing and troubleshooting of the MVME177. In order to use the diagnostics, you must switch to the diagnostic directory. You may switch between directories by using the SD (Switch Directories) command. You may view a list of the commands in the directory that you are currently in by using the HE (Help) command. If you are in the debugger directory, the debugger prompt 177-Bug> displays, and all of the debugger commands are available. Diagnostics commands cannot be entered at the 177-Bug> prompt. If you are in the diagnostic directory, the diagnostic prompt: 177-Diag> displays, and all of the debugger and diagnostic commands are available.

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