HI-6120 HOLTIC [Holt Integrated Circuits], HI-6120 Datasheet - Page 97
![no-image](/images/no-image-200.jpg)
HI-6120
Manufacturer Part Number
HI-6120
Description
MIL-STD-1553 Remote Terminal ICs
Manufacturer
HOLTIC [Holt Integrated Circuits]
Datasheet
1.HI-6120.pdf
(157 pages)
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NOTES:
1. The 22 undefined mode commands can be rendered invalid by setting the UMCINV (undefined mode codes
2. Response to the reserved mode commands is fully defined by Illegalization Table settings. As described in (a) and
3. HI-6120/21 cannot fulfill Bus Control duties.
Command
T/R bit
invalid) option bit in Configuration Register1. If UMCINV is asserted, there is no recognition of the undefined com-
mand by the terminal. If UMCINV is zero, the commands are considered valid. Terminal response when UMCINV
equals 0 is wholly determined by the Illegalization Table:
a. If a command’s bit in the Illegalization Table equals zero, the terminal responds “in form” with Clear Status.
b. If a command’s bit in the Illegalization Table equals one, the command is considered illegal. The Message
(b) above, the terminal illegalizes any reserved mode command having Illegalization Table bit equal to 1, and re-
sponds “in form” when the Table bit equals zero. The “in form” response for reserved mode commands 16 through
31 transacts a received or transmitted data word.
1
0
1
Mode commands 17, 20 and 21 are undefined when T/R bit equals one, but will transmit a contiguous data
word. Mode commands 16, 18 or 19 are undefined when T/R bit equals 0, but will receive a contiguous data
word.
Error (ME) status bit is asserted and the terminal transmits status without data word. Illegal mode commands
16-31 will not transmit or receive a mode data word.
Binary
10101
01001
01001
01111
01111
Mode Code
to
to
Dec.
21
22
31
22
31
to
to
Reserved Mode Commands 22 - 31 with
Reserved Mode Commands 22 - 31 with
MIL-STD-1553 Defined Function
HOLT INTEGRATED CIRCUITS
Undefined Mode Command
HI-6120, HI-6121
T/R bit = 0
T/R bit = 1
97
Associated
Data Word
Yes
Yes
Yes
Broadcast
Allowed
Yes
No
No
Note
See
(1)
(2)
(2)
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