MIL-STD-1553 BUS data is packetized in Message Mode, where each 1553 bus "transaction" is recorded as a "message." A four-item Intra-Packet Data Header is inserted prior to each transaction. A transaction is a BC-to-RT, RT-to-BC, or RT-to-RT word sequence, starting with the command word and including all data and status words that are part of the transaction, or a mode code word broadcast. Multiple messages may be encoded into the data portion of a single packet.

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11/19/2021 13:41 - Abdulwaris (majboorabdulwaris at gmail dot com)

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06/26/2009 16:58 - Marc Benstein (initialzero at gmail dot com)

Should this section also include how to assemble UDP segmented packets? The segmented packet documentation is very vague.

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01/17/2007 23:34 - Bob (bob dot baggerman at gatech dot edu)

There is not enough info about the layout of command words, status words, and data. In a Ch 10 data file the order of command word(s), status word(s), and data words are the same as on the wire. In other words, the same order shown in the 1553 spec.

This really should be spelled out explicitly in this spec but isn't. This order, although reasonable I suppose, isn't universal. The UTMC 1553 parts, for example, put the command words, status words, and data words in fixed location offsets in memory. This is great because if I want to read them I don't have to calculate the offset into the data structure to get their location like with this Ch 10 spec. In other words, with the Ch 10 layout the location of the status word (and data in the case of RT to RT) needs to be calculated for every data packet. Annoying but not that big of a deal, .... if you know going in what the layout is.

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msb 31 30	29 24	23lsb 0
TTB	RESERVED	MSGCOUNT
Message Count (MSGCOUNT). (Bits 23-0) indicate the binary value of the number of messages included in the packet. An integral number of complete messages will be in each packet. Reserved. (Bits 29-24) are reserved. Time Tag Bits (TTB). (Bits 31-30) indicate which bit of the MIL-STD-1553 message the Intra-Packet Header time tags. 00 = Last bit of the last word of the message 01 = First bit of the first word of the message 10 = Last bit of the first (command) word of the message 11 = Reserved

15-14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
R	BID	ME	RR	FE	TM	R	R	R	LE	SE	WE	R	R	R
Reserved. (Bits 15-14) are reserved. Bus ID (BID). (Bit 13) indicates the bus ID for the message. 0 = Message was from Channel A 1 = Message was from Channel B Message Error (ME). (Bit 12) indicates a message error was encountered. 0 = No message error 1 = Message error RT to RT Transfer (RR). (Bit 11) indicates a RT to RT transfer; message begins with two command words. 0 = No RT to RT transfer 1 = RT to RT transfer Format Error (FE). (Bit 10) indicates a frame error 0 = No format error 1 = Format error Response Time Out. (Bit 9) indicates a response time out occurred. 0 = No response time out 1 = Response time out Reserved. (Bits 8-6) are reserved Word Count Error (LE). (Bit 5) indicates a word count error occurred. 0 = No word count error 1 = Word count error Sync Type Error (SE). (Bit 4) indicates an incorrect sync type occurred. 0 = No sync type error 1 = Sync type error Invalid Word Error (WE). (Bit 3) indicates an invalid word error occurred. 0 = No invalid word error 1 = Invalid word error Reserved. (Bits 2-0) are reserved.

msblsb
158	70
GAP 2	GAP 1

msb	lsb
15	0
PACKET HEADER
CHANNEL SPECIFIC DATA (BITS 15-0)
CHANNEL SPECIFIC DATA (BITS 31-16)
INTRA-PACKET TIME STAMP FOR MSG 1 (BITS 15-0)
INTRA-PACKET TIME STAMP FOR MSG 1 (BITS 31-16)
INTRA-PACKET TIME STAMP FOR MSG 1 (BITS 47-32)
INTRA-PACKET TIME STAMP FOR MSG 1 (BITS 63-48)
INTRA-PACKET DATA HEADER FOR MSG 1 (BITS 15-0)
INTRA-PACKET DATA HEADER FOR MSG 1 (BITS 31-16)
INTRA-PACKET DATA HEADER FOR MSG 1 (BITS 47-32)
COMMAND WORD
COMMAND, STATUS, OR DATA WORD
DATA OR STATUS WORD
:
DATA OR STATUS WORD
INTRA-PACKET TIME STAMP FOR MSG 2 (BITS 15-0)
INTRA-PACKET TIME STAMP FOR MSG 2 (BITS 31-16)
INTRA-PACKET TIME STAMP FOR MSG 2 (BITS 47-32)
INTRA-PACKET TIME STAMP FOR MSG 2 (BITS 63-48)
INTRA-PACKET DATA HEADER FOR MSG 2 (BITS 15-0)
INTRA-PACKET DATA HEADER FOR MSG 2 (BITS 31-16)
INTRA-PACKET DATA HEADER FOR MSG 2 (BITS 47-32)
COMMAND WORD
COMMAND, STATUS, OR DATA WORD
DATA OR STATUS WORD
:
DATA OR STATUS WORD
:
INTRA-PACKET TIME STAMP FOR MSG N (BITS 15-0)
INTRA-PACKET TIME STAMP FOR MSG N (BITS 31-16)
INTRA-PACKET TIME STAMP FOR MSG N (BITS 47-32)
INTRA-PACKET TIME STAMP FOR MSG N (BITS 63-48)
INTRA-PACKET DATA HEADER FOR MSG N (BITS 15-0)
INTRA-PACKET DATA HEADER FOR MSG N (BITS 31-16)
INTRA-PACKET DATA HEADER FOR MSG N (BITS 47-32)
COMMAND WORD
COMMAND OR DATA, WORD
DATA OR STATUS WORD
:
DATA OR STATUS WORD
PACKET TRAILER

CHAPTER 10

DIGITAL ON-BOARD RECORDER STANDARD

2005