HI-6121PQMF HOLTIC [Holt Integrated Circuits], HI-6121PQMF Datasheet - Page 50

• Manufacturer Part Number: HI-6121PQMF
• Description: MIL-STD-1553 Remote Terminal ICs
• Manufacturer: HOLTIC [Holt Integrated Circuits]

MESSAGE DATA BUFFERS, Cont.
Here is an example data structure for a receive mode command without data (mode code values 0x00 through 0x0F). Note:
None of these receive mode commands are defined under MIL-STD-1553B but the device responds “in form” if illegal
command detection is not used (corresponding bits in Illegalization Table are logic 0)
Register 1 is logic 0. Notice that the data pointer points to the data structure starting address, the message information word.
The data pointer is located in the receive mode command’s Descriptor Block, fully described later:
The following bits comprise the receive mode Message Information Word:
Bit No.
15
14
13
12
11
10
9
8
7-6
5
4-0
MSB
Data pointer equals 0x0500
15 14 13 12 11 10 9
X
Mnemonic Function
——
IWDERR
GAPERR
WCTERR Word Count Error
SYNERR
MERR
WASBSY
ILCMD
——
BUSID
MC4:0
Not used.
Invalid Word Error.
Assertion of this bit indicates Manchester error or parity error was observed in a received data word.
Gap Error.
Assertion of this bit indicates bus activity was detected immediately after a received mode data word
or that a gap occurred before the data word was received.
This bit is asserted if the command is received without expected mode data word, or with extra word.
Sync Error.
This bit is asserted when incorrect (command/status) sync type occurs in received mode data word.
Message Error.
This bit is asserted when message error status change occurs during command processing. See bits
11- 14 for details.
Was Busy Status.
This bit is asserted when the terminal responds to the mode command with BUSY status, due to
global BUSY bit set in 1553 Status Bits Register, or command-specific MKBUSY bit set in the
descriptor table Control Word.
Illegal Command Received.
This bit is asserted when the Illegalization Table bit corresponding to the received command equals
one. The Illegalization Table should only contain nonzero values when “illegal command detection” is
being applied. See section entitled Illegalization Table for further information.
Not used.
Bus Identification.
If this bit equals zero, message was transacted on Bus A. If bit equals one, it was transacted on Bus B.
Mode Code.
This 5-bit field contains the mode code extracted from the command word.
8
———>
———>
X
7
X
6
Hex Address
Data Buffer
5
0x0500
0x0501
4
HOLT INTEGRATED CIRCUITS
3
2
HI-6120, HI-6121
1
0
Word Description
Message Information Word
Time-Tag Word
LSB
50
and
Word Is Written By
Device, after message completion
“
the UMCINV bit in Configuration
“
“
“