Motorola MVME2600 manual RLB4 DCD4 Idreq ∗ TM4/MID2 DTR1 RI4 DTR2 RI1, DSR1, DCD1, RI2, DSR2, DCD2

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Functional Description

Table 3-2. P2 Multiplexing Sequence (Continued)

MXDO (From Base Board)		MXDI (From MVME761)
Time Slot	Signal Name	Time Slot	Signal Name
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

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.

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