PAS 9795/DIO : 80 Channel VME Digital
Input /
Output Card
Links to printable product info:
The PAS 9795/DIO is a VME based, 80 Channel, TTL level,
Digital Input / Output card. Sixty-four of the channels are arranged
as eight byte wide bi-directional data ports. Each port consists
of an eight bit output data register with output enable, and an
eight bit input buffer. The input buffers always monitor the state
of the I/O lines, and the output data registers can either drive
the I/O lines, or disconnect from the I/O by assuming a high impedance
state. Individual data ports can be programmed for input or
output by clearing or setting the appropriate bits in the
output enable registers. When the data port is configured as an
output the state of the output lines can be read back with the input
register.
Eight flag I/O channels are available that can either be used as
interrupt acknowledge lines or as general purpose I/O . Flag channels
have the same drive capability and configurability as the data ports.
The direction of the flag channels is controlled with two bits in
the Control and Status Register. Jumper plugs can be installed to
bypass the control bits and always configure the flag channels as
outputs.
Eight interrupt lines are provided to allow externally connected
devices to generate VMEbus interrupts on any level. External interrupts
can be individually enabled or disabled using two byte wide Interrupt
Mask Registers. Jumpers on the board are used to configure the interrupt
circuits to either detect and latch interrupts on the rising or
falling edge of the interrupt input signal. All of the interrupt
input signals are pulled up with 10 K Ohm resistors to keep unused
interrupt logic in the high state.
The channels are divided in two blocks of 40 channels. Each
block of I/O lines is terminated on a 50 position shrouded
header at the cards front panel. The channels in each block consist
of four byte wide bi-directional data ports, four flag
I/O lines and four interrupt input lines.
Key Features
-
80 TTL level I/O signals arranged as, 64 general purpose
I/O, 8 flag I/O, 8 interrupts
-
General purpose I/O arranged as
8 byte wide bi-directional data ports
-
Flag I/O arranged as
1 byte wide bi-directional data ports
-
Flag I/O jumper configurable
as output only for interrupt acknowledge applications
-
Interrupt
latch inputs arranged as 1 byte wide input registers
-
Interrupt circuit detects rising or falling edge of interrupt input, and latches on the edge
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