PAS 9797/DIO : 160 Channel VME Digital
Input/Output Card
Links to printable product info:
The PAS 9797/DIO is a VME based, 160 Channel, TTL level, Digital
Input / Output card. One hundred twenty eight channels are arranged
as sixteen, byte wide bi-directional data ports. These are the primary
data ports and support 32 bit transfers. The remaining thirty two
channels are arranged as four 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.
The channels are divided into four blocks of 40 channels. Each block
of I/O lines is terminated on a 50 position shrouded header
at the card’s front panel. The channels in each block consist
of four byte wide bi-directional primary data ports, and eight additional
I/O lines. The additional lines are from the B4, B5, D4 and D5 registers.
Signals from these registers can be used as strobes and status lines
for the primary data ports, or as general purpose I/O lines.
VME systems with A16, A24, or A32 addressing, and data bus
widths of 8, 16 and 32 bits are supported. Thirty-two bit transfers
are only supported by the primary data ports. The other registers
on the card use byte or word transfers. DIP switches are used to
configure the width of the address bus, and the instruction determines
the width of the data transfer. A board identifier PROM and Control
& Status register are also provided.
Key Features
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160 TTL level I/O signals arranged as, 128 primary general
purpose I/O, • 32 strobe or general purpose I/O
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General
purpose I/O arranged as16 byte wide bi-directional data
ports
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Additional I/O arranged as 4 byte wide bi-directional
data ports
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Input / Output lines are terminated on 2, dual
50 position shrouded headers at the front panel
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All output
signal lines have high current, 64 mA, sink current capability
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SYSFAIL
LED and Pass LED at the front panel
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VME SYSFAIL assert on
power up, jumper selectable
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VME access : D32, D16, D8; A32,
A24, A16 Slave
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VME interrupts; none
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VME 6U form factor; 233 mm x 160 mm card size
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