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Page Title:
Air Navigation Computer Unit (ANCU) |
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|  MIL-N-81604C(AS)
Para 3.5.3.5
(cont)
Installation - The PSU shall be designed to meet the
d.
-
vibration requirements stated in 3.3.10.1 when in
stalled as a"hard-mounted" unit. The unit shall be
mounted horizontally and shall be retained in the
rear by two 0.25-inch diameter guide pins which will
recess in holes provided in the PSU chassis as shown
in figure 24. Tabs will be provided on the front of *
*
the PSU which will accept no. 10 or 0.25-inch hold-
down screws and washers.
The battery shall be sealed nickel-cadmium cells with
no requirement for external venting.
3.5.4 Air Navigation Computer Unit (ANCU)
3.5.4.1 Function - The ANCU shall provide the data processing
capabilities of a general purpose digital computer. It shall
accept inputs of pitch, roll,heading, velocity increments,
temperature monitors, mode status, and calibration data from the
IMU, manually initiated information from the CIU, data from
external avionics via the CAU, and data directly from external
avionics. The ANCU shall have the necessary control logic,
memory, arithmetic and input/output capability to perform mode
control, inertial alignment and the required navigation and
steering computations. The ANCU shall furnish display informa-
tion to the CIU, gyro torquing to the IMU, and the required
outputs to external avionics via the CAU.
3.5.4.2 Memory - The memory capacity shall be a maximum of
12,288, 28-bit words internally expandable from 4096 words in
4096-word blocks. Memory cycle time shall not exceed four
microseconds. The memory shall be nonvolatile, electrically
alterable, and shall have the capability of inhibiting the
write function in those words where the critical software program
is stored except when interfacing with the program fill equipment.
Direct access to the memory modules shall be available to exter-
nal devices at the end of each instruction. Word length shall
be 28 bits, including a sign bit.
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