Xycom XVME-240, Руководство пользователя

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XVME-240 Manual
October, 1984
Table B-l. VMEbus Signal Identification (cont’d)
Signal
Mnemonic
SYSCLK
Connector
and
Pin Number
1A: 10
Signal Name and Description
SYSTEM CLOCK - A constant 16-MHz clock signal
that is independent of processor speed or timing.
This signal is used for general system timing use.
SYSFAIL* lC: 10 SYSTEM FAIL - Open-collector driven signal that
indicates that a failure has occurred in the system.
This signal may be generated by any module on the
VMEbus.
SYSRESET* 1C:12 SYSTEM RESET - Open-collector driven signal
which, when low, will cause the system to be reset.
WRITE* 1A:14 WRITE - Three-state driven signal that specifies
the data transfer cycle in progress to be either
read or written. A high level indicates a read
operation; a low level indicates a write operation.
+5V STDBY IB: 31 +5 Vdc STANDBY - This line su5 Vdc to
devices requiring battery backup.
+5v 1A: 32
1B: 32
lC: 32
+5 Vdc Power - Used by system logic circuits.
+12v
-12v
lC: 31
1A: 31
+12 Vdc Power - Used by system logic circuits.
- 12 Vdc Power - Used by system logic circuits.
B-4