FOXBORO P0916JY Speed module

As the initialization proceeds, the execution path comes to the "prompt" routine. Before sending the prompt, this routine places an R in the MPCR to indicate that initialization is complete. Then the prompt is sent. – If no terminal is connected to the port, the MPCR is still polled to see whether an external processor requires control to be passed to the dual-port RAM. 

– If a terminal does respond, the MPCR is polled for the same purpose while the serial port is being polled for user input. 

– An ASCII G placed in the MPCR by a remote processor indicates that the Go Direct type of transfer is requested.

– An ASCII B in the MPCR indicates 

that breakpoints are to be armed before control is transferred (as with the GO command). In either sequence, an E is placed in the MPCR to indicate that execution is underway just before control is passed to RAM. (Any remote processor could examine the MPCR contents.) 4. If the code being executed in dual-port RAM is to reenter the debug monitor, a TRAP #15 call using function $0063 (SYSCALL .RETURN) returns control to the monitor with a new display prompt. Note that every time the debug monitor returns to the prompt, an R is moved into the MPCR to indicate that control can be transferred once again to a specified RAM location.

Global Control and Status Register (GCSR) Method 

A remote processor can initiate program execution in the local MVME167 dual-port RAM by issuing a remote GO command using the VMEchip2 Global Control and Status Registers (GCSR). 1. The remote processor places the MVME167 execution address in general purpose registers 0 and 1 (GPCSR0 and GPCSR1). 2. The remote processor then sets bit 8 (SIG0) of the VMEchip2 LM/SIG register. 3. This causes the MVME167 to install breakpoints and begin execution. The result is identical to the MPCR method (with status code B) described in the previous section.

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