Motorola MVME2603-1121A, Installation And Use Manual

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Block Diagram
3-18
3
ABORT Switch (S1)
The
ABORT
switch is located on the LED mezzanine. When activated
by software, the
ABORT
switch can generate an interrupt signal from
the base board to the processor. The interrupt is normally used to
abort program execution and return control to the debugger
firmware located in the MVME2603/2604 EPROM and Flash
memory. The interrupt signal reaches the processor module via ISA
bus interrupt line IRQ8
∗ . The signal is also available at pin PB7 of
the Z8536 CIO device, which handles various status signals, serial
I/O lines, and counters.
The interrupter connected to the
ABORT
switch is an edge-sensitive
circuit, filtered to remove switch bounce.
Table 3-2. P2 Multiplexing Sequence
MXDO (From Base Board) MXDI (From MVME761)
Time Slot Signal Name Time Slot Signal Name
0 RTS3 0 CTS3
1 DTR3 1 DSR3/MID1
2 LLB3/MODSEL 2 DCD3
3 RLB3 3 TM3/MID0
4 RTS4 4 RI3
5 DTR4 5 CTS4
6 LLB4 6 DSR4/MID3
7 RLB4 7 DCD4
8 IDREQ
∗
8 TM4/MID2
9 DTR1 9 RI4
10 DTR2 10 RI1
11 Reserved 11 DSR1
12 Reserved 12 DCD1
13 Reserved 13 RI2
14 Reserved 14 DSR2
15 Reserved 15 DCD2