user manual

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Functional Description

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.

RESET Switch (S2)

The RESET switch is located on the LED mezzanine. The RESET switch

resets all onboard devices; it also drives a

SYSRESET∗ signal if the

MVME2603/2604 is the system controller.

7 RLB4 7 DCD4

8IDREQ

∗ 8 TM4/MID2

9DTR1 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

Table 3-2. P2 Multiplexing Sequence (Continued)

MXDO (From Base Board) MXDI (From MVME761)

Time Slot Signal Name Time Slot Signal Name