 |
|||
|
|
|||
| ||||||||||
|
|  MIL-N-81604C(AS)
Para 3.4.4.3.1a.
(cont)
*
In the data mode, whenever the sync signal to
the ANCU goes true, the ANCU shift registers
shall shift. As long as a signal is present
*
on sync, data shall shift into either the
Command-Address Register or the Data Register
in the ANCU. At the same time, the previous
contents of the Data Register shall be trans-
mitted on Data 2 to the CAU. During the first
*
12-bit times of the envelope on sync, the data
(new command-address) received on Data 1 shall
*
be shifted into the Command-Address Register.
*
At the same time, the original data (old com-
mand-address) in the Command-Address Register
*
shall be shifted into the Data Register as the
Data Register is being shifted out on Data 2.
All subsequent data within the envelope shall
be shifted into the Data Register directly.
In order to allow the CAU to know when returned
data have arrived, a "1" shall precede the lead- *
ing edge of the data transmitted on Data 2. At
*
the end of the envelope received on the sync
lines , the contents of the Command Register
shall be analyzed in the ANCU. When the envelope
on the sync lines first appears, a Busy discrete *
shall be sent to the CAU. This Busy signal
shall remain until interleave or interrupt, if
one is specified, is complete.
*
The address in the command-address word from
the CAU shall be nine bits in length. The
least significant five bits are controlled by
the CAU and the most significant four bits
are controlled by the ANCU. No address infor-
mation placed in the four most significant
bits by the CAU will be used by the ANCU. This
will allow the ANCU program to select those 32
location blocks of memory into which and from
which the CAU may interleave.
b.
ANCU Request Mode - The ANCU request mode shall
provide a signal to the CAU indicating that
the computer has data available or that the
computer is requesting data. The computer
shall initiate this mode by loading the
58
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals