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Revision B User Manual
for the VME-SIO4: Board Revision: A
General Standards Corporation
8302A Whitesburg Drive Huntsville, AL 3580, Phone: (256) 880-8787
11
Interrupt status bits are cleared by writing a 1 to the respective bit in the interrupt status register. A second interrupt
from that bit will not occur until after that status bit has been cleared.
1.11
DIAGNOSTIC LED DISPLAYS
LEDs provide for indication of the following conditions:
a. BIT loop-back pass/fail status (FAIL LED);
b. Channel 0 Receiver is empty
c. Channel 1 Receiver is empty
d. Channel 2 Receiver is empty
e. Channel 3 receiver is empty
f. IRQ Pending
g. VME Access
h. Spare LED.
1.12
CABLE INTERFACE CONNECTIONS
There are four female DB25 cable interface (user I/O interface) connectors mounted at the front edge of the board:
P3 – Channel 0, P4 – Channel 1, P5 – Channel 2, P6 – Channel 3. The pinout is shown below:
Signal Name
Rev N/R
Rev A
Lower TxD/RxD +
Pin 25
Pin 3
Lower TxD/RxD -
Pin 12
Pin 16
Lower CTS/DCD +
Pin 24
Pin 5
Lower CTS/DCD -
Pin 11
Pin 18
Lower Tx/Rx CLK +
Pin 23
Pin 9
Lower Tx/Rx CLK -
Pin 10
Pin 22
Upper TxD/RxD -
Pin 9
Pin 10
Upper TxD/RxD +
Pin 22
Pin 23
Upper CTS/DCD -
Pin 8
Pin 11
Upper CTS/DCD +
Pin 21
Pin 24
Upper Tx/Rx CLK -
Pin 7
Pin 12
Upper Tx/Rx CLK +
Pin 20
Pin 25