Motorola MVME197LE manual Mpar

Debugger General Information

The status codes that may be set by the bus master are:

	ASCII	G	(HEX 47)	Use Go Direct (GD) logic specifying the
				MPAR address.
3
	ASCII	B	(HEX 42)	Install breakpoints using the Go (G) logic.

The Multiprocessor Address Register (MPAR), located in shared RAM location of $3004 offset from the base address the debugger loads it at, contains the second of two words used to control communication between processors. The MPAR contents specify the address at which execution for the remote processor is to begin if the MPCR contains a G or B. The MPAR is organized as follows:

$3004

*

*

*

*

(MPAR)

At power up, the debug monitor self-test routines initialize RAM, including the memory locations used for multi-processor support ($3000 through $3007).

The MPCR contains $00 at power-up, indicating that initialization is not yet complete. 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.)

If the code being executed in dual-port RAM is to reenter the debug monitor, a TRAP #496 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.

3-16 Installation Guide