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Page Title:
Appendix I. Computer Input/Output Specification |
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|  MIL-D-81347C(AS)
APPENDIX I
COMPUTER INPUT/OUTPUT SPECIFICATION
1.
SCOPE
1.1
This appendix details the input/output, transfer and timing
sequences for Computer CP-901/ASQ-114.
2.
REQUIREMENTS
2.1
Functional
General - Communication with the Computer is carried
2.1.1
on in a 30-bit parallel mode over the input/output channels. The Computer accommodates four 1/0
channel groups, each channel group containing four pairs of input/output channels, a time shared out-
put register , input selection circuits, local 1/0 control, and priority circuits. These channels can be
designated as either normal or inter-computer channels. It should be noted that all references in this
specification to input or output are made from the standpoint of the computer; that is, "input" is input
to the computer and "output" is output from the computer.
2.1.2
Control Communication - The Computer is designed to use a
d-c level input /output system. Signals are d-c levels which may be changed upon interchange of con-
trol information. Output data signals from an input/output unit may exist for microseconds or days,
depending on the nature of the particular task. The data lines will not change until another output is
made from one of the four output channels contained in a particular input/output group.
2.1.3
Data and Control signals - Each channel shall have associated
with it 30 data lines and 4 control lines as listed in Table 1-1. All lines are twisted pair.
TABLE 1-1. CONTROL SIGNALS IN NORMAL PERIPHERAL EQUIPMENT CHANNELS
Sending Equipment
Control Signal
Input Channel
1. Interrupt Enable
Computer
Control Lines
2 . Interrupt
Peripheral
3. Input Data Request
Peripheral
4. Input Acknowledge
Computer
Output Channel
1. External Function Request
Peripheral
Control Lines
2. External Function
Computer
3. Output Data Request
Peripheral
4. Output Acknowledge
Computer
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