PAS 9796/DIO : 160 Channel VME Digital
Input/Output Card
Links to printable product info:
Precision Analog Systems’ 9796/DIO card provides 160 TTL
level, Digital Input / Output channels on the 6U VMEbus format.
One hundred twenty eight of the channels are arranged as 16 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. 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.
Sixteen flag I/O channels are available that can either be used
as interrupt acknowledge lines or as general purpose I/O. Sixteen
interrupt lines are provided to allow externally connected devices
to generate VMEbus interrupts. I/O lines are divided into four blocks
of 40 channels. Each block consist of four byte wide bi-directional
data ports, four flag I/O lines and four interrupt input lines terminated
on a 50 position shrouded header at the cards front panel.
VME systems with A16, A24, or A32 addressing and data bus widths
of 8, 16 and 32 bits are supported. Thirty-two bit transfers allow
an entire block of channels to be updated with one VMEbus transfer.
Additional features include a board identifier PROM, Control and
Status register and interrupt control registers.
Key Features
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160 TTL level I/O lines: 128 Data, 16 Flag, and 16
Interrupt
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Data I/O arranged as 16 byte wide bi-directional data
ports
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Flag I/O arranged as two byte wide bi-directional data ports
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Flag
I/O configurable as output only for interrupt handshake
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Interrupt
Latch inputs arranged as two byte wide input ports
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All output
signal lines have 64 mA sink current capability
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Interrupt edge
detection is jumper selectable per bit
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Interrupt circuits latch
rising or falling edges of interrupts
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Interrupts are mask able
on a per bit basis
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All interrupt and input lines are pulled up
with 10 K Ohms
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VME SYSFAIL asserts on power up, jumper selectable
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VME 6U form
factor; 233 mm x 160 mm card size.
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