Motorola MVME2600 Series User Manual download pdf (Page 51)

100

101

General Information

1-33

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.

G placed in the MPCR by a remote processor indicates that the Go

Direct type of transfer is requested (as with the GD command). A

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 re-enter PPCBug,

a system call using function $0063 (SYSCALL .RETURN) returns

control to PPCBug with a new display prompt. Note that every time

PPCBug 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.

Data and Address Sizes

Data and address sizes are defined as follows:

A byte is eight bits, numbered 0 through 7, with bit 0 being the least

significant.

A half-word is 16 bits, numbered 0 through 15, with bit 0 being the

least significant.

A word is 32 bits, numbered 0 through 31, with bit 0 being the least

significant.

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 517 518

Comments to this Manuals

No comments

Motorola MVME2600 Series User Manual Page 51

Comments to this Manuals

Related products and manuals for PC/workstation barebones Motorola MVME2600 Series