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Page Title:
Data Analysis Logic Unit MX-8023A/AYA-8 (Logic Unit 1) |
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|  MIL-D-81347C(AS)
Detail Requirements
3.5
D a t a Analysis Logic Unit MX-8023A/AYA-8 (Logic Unit 1)
3.5.1
Function - See 3.4.7
3.5, 1.1
Form Factor - Refer to illustration in EI-515, Avionics Instal-
3.5. 1.2
lation Instructions for Data Analysis Programming Group AN/AYA-8B.
Weight - The total weight of Logic Units 1, 2, 3 and 4 shall not
3.5. 1.3
exceed 680 pounds.
Contents - See 3.4.2
3.5. 1.4
3.5. 1.4.1
Digital Input Multiplexer
Functional Description - The computer is capable of servicing 16
3. 5.1.4.1.1
input peripheral equipments which utilize the normal input data transfer. The DPS contains more than
16 input peripherals;-however, the rate and priority of the data to many of the the peripherals do not
demand real time access to the computer memory: i.e. , many of the peripherals can communicate with
the computer via a buffer unit. In the DPS, this common input buffer is termed the Digital Input Multi-
plexer (DIM). Figure 2 is a functional flow diagram for the DIM. Figure 3 is a timing diagram.
General Description - The DIM shall provide the capability of
3.5.1.4.1.2
transmitting up to 12 data bits from each of the 1 6 input peripherals to the computer via a single com-
puter input channel. The operation of the DIM shall be independent of the Digital Output Multiplexer
(DOM) except for test loops.
Operating Requirements
3.5.1.4.1.3
Data Transfer - Peripheral Equipment to Computer via Digital
3.5.1.4.1.3.1
Input Multiplexer - An input peripheral equipment which communicates with the computer via the DIM
shall be able to transmit one 12-bit word to the computer by following the control line sequence given
below:
(1) A peripheral equipment places its data on the 12 data lines
to the DIM.
(2) The peripheral equipment sets the Enter line to the DIM to
indicate that it has data ready for transmission.
(3) The DIM detects the Enter signal.
(4) The DIM places the 12 data bits from the peripheral equip-
ment and 4 address bits on the computer data lines.
(5) The DIM sets the Input Data Request line to indicate that it
has data ready for transmission to the computer except for channel 11 where it raises an Interrupt.
(6) The computer 1/0 subunit detects the Input Data Request.
(7) The computer samples the 16 data lines, at its convenience.
(8) The computer sets the Input Acknowledge line indicating
that it has sampled the data.
(9) The DIM drops the data lines and the Input Data Request
line.
(10) The DIM sets the Channel Input Acknowledge line to the
peripheral equipment indicating that `the computer has sampled the data lines. -
17
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