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|  MIL-D-81347C(AS)
Spare Computer Channel (SCC)
3.5.4.4.2
Functional Description - The SCC subunit shall be designed to
3.5.4.4.2.1
interface signals between the computer, the Logic Unit 4 MCPL and an external peripheral assigned to
computer channel 14.
General Description - The SCC shall provide the capability of
3.5.4.4.2.2
transmitting 30 data bits to and from the peripheral assigned to computer channel 14. It shall also
provide for transmitting 30 bits to and from the MCPL. The input and output control functions associ-
ated with computer channel 14 shall also be interfaced by the SCC.
Operating Requirements
3.5.4.4.2.3
Data Transfer - Peripheral Equipment and SCC to Computer-
3.5.4.4.2.3.1
Communications from the SCC to the computer shall be in accordance with Appendix L A peripheral
which connects to the computer via the SCC shall be able to transmit up to 30 data bits directly to the
computer using Input Data Request/Input Acknowledge or External Interrupt.
Data Transfer - Computer to Peripheral Equipment and SCC -
3.5.4.4.2.3.2
Communication from the computer to the SCC and the peripheral equipment shall be in accordance with
Appendix L A peripheral which connects to the computer via the SCC shall be able to receive up to 30
data bits from the computer using Output Data Request/Output Acknowledge or External Function
Request/External Function.
Timing and Initialization -
3.5.4.4.2.4
(1) The SCC shall not perform any logic function on the peripheral
output or input lines that shall delay their transmission to the computer or to the peripheral for more
than 1.0 microseconds.
(2) The SCC shall be self-initializing, i.e., when power is
applied to the SCC, no Logic 1's shall be transmitted on the SCC control lines to the computer and the
SCC shall be ready for normal operation.
Interface Requirements - Refer to Figure 138, the Functional
3.5.4.4.2,5
Flow Diagram for the SCC.
3.5.4.4.2.5.1
SCC to Computer
(1) Signal characteristics shall be in accordance with Appendix 11
and WR-101, Section II.
(2) All signals shall be transmitted over twisted pair cables.
3.5.4.4.2.5.2
SCC to and from MCPL - Communications between the Mainten-
ance Control Panel Logic and the SCC shall be in accordance with 3.5.1.4.9.
3.5.4.4.2.5.3
SCC to and from Peripheral Equipment
(1) Signal characteristics shall be in accordance with Appendix
11 and WR 101, Section II.
(2) All signals shall be transmitted over twisted pair cables.
(3) The interface that the SCC presents to the peripheral equip-
ment will be identical to the interface that would be seen at the computer.
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