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|  MIL-N-81604C(AS)
Para 3.4.404a(1)
(cont)
250 KHz from the CAU. The line driver in the
ANCU and the line receiver in the CIU shall be
Type A circuits.
(2) Control - This control input to the CIU shall
be supplied by the controlling unit. It shall
go true (high) for 28 clock periods to indicate
to the CIU that data are to be taken in,
*
sent out, or taken in and sent out. The true
(high) state shall enable transmission. The
line driver in the ANCU and the line receiver
in the CIU shall be Type A circuits.
(3)
Serial Data to CIU - This data line shall trans-
mit 8 bits of address plus 28 bits of data
(Status or Display Word) LSB first from the
CAU or ANCU. The Status Word shall contain
the bits which control the LINK, ALN, FREE,
MS, EM, INS, DOP, AD, POS FIX, CLEAR, and
ENTER lamps. Each of these lamps shall have
one bit in the Status Word (see table XI).
*
There shall be one Data Word assigned to each
of the two displays (see table XII). The sign
and punctuation of the Display Words shall be
contained within the Status Ward. The 8 bits
of address for the Status Word and two Display
Words shall conform to table XIII. The line
*
driver in the ANCU and the line receiver in
the CIU shall be Type A circuits.
(4)
Serial Data from CIU - This data line shall
transmit 28 bits of data (Command or Display
Word) LSB first to the ANCU or CAU. The Com-
mand Word bits shall represent the position
of the DATA switch (12 bits), MODE switch (6
bits), WAYPOINT selector (4 bits), CLEAR push-
button (1 bit), and ENTER mode selector (2 bits)
(see table XVV.The two Display Words, left
*
or right, shall contain the data to be entered
(see table XII). The 8 bits of address for the *
Command and two Display Words shall conform to
table XIII. The line driver in the CIU and the *
line receiver in the ANCU shall be Type A
circuits.
70
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