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|  MIL-N-81604C(AS)
`Appendix I
Para 30.5.8.2
(cont)
.
CP Messaqe Out - This message from the CAU shall
e.
contain velocity north, velocity east, true
heading, and magnetic heading. Refer to
The CAU line driver shall be a Type
30.5.8.2a.
2 circuit.
CP Message Request Out - This message request
f.
from the CAU shall be answered by the CP with a
message gate and message. Refer to 30.5.8.2b.
The CAU line driver shall be a Type 1 circuit.
CP Message Gate In - This message gate from the
g.
CP shall bracket all bits inthe CP Message In.
*
Refer to 30.5.8.2b. The CAU line reciver shall *
be a Type 2 circuit.
h.
CP Message In - This message from the CP shall
contain latitude and longitude information
Refer to 30.5.8.2b. The CAU line reciever shall
be a Type 2 circuit.
CP Clock - The CP shall provide a continuous
i.
1.2-MHz clock to the CAU for clocking data to
and from the CP. The accuracy shall be 0.1
The CAU line receiver shall be a
percent.
Type 2 circuit.
30.5.8.3 CAU/CIG Serial Interface - This interface shall be
identical in operation to the CAU/CP serial interface for CPO
*
type requests (refer to 30.5.8.2a) with the exception that only
*
the true heading/magnetic heading data stored in the CP-CIG
*
register no. 3 are transferred to the CIG upon the CIG request
signal coming true. When this occurs (the CIG may request data
up to 20 times per second) , the 32 bits of data are transferred
*
to the CIG in the format shown in figure 38 as well as being
*
recirculated in CP-CIG register no. 3 to await CP request or
.
In addition, the CP message request has
update from the ANCU.
first priority over the CIG message request, should the two
occur concurrently. The CAU shall provide a 1.2-MHz clock for
.
clocking data to the CIG.
CIG Message Request - This message request from
a.
the CIG shall be answered by the CAU with a
-
message gate and a message. Refer to 30.5.8.3. *
The CAU line receiver shall be a Type 1 circuit.
171
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