hi-6131pqtf QuickLogic Corp, hi-6131pqtf Datasheet - Page 114

• Manufacturer Part Number: hi-6131pqtf
• Description: Mil-std-1553 / Mil-std-1760 3.3v Bc / Mt / Rt Multi-terminal Device
• Manufacturer: QuickLogic Corp

14.3. IRIG-106 Packet Header Description
The length of the packet header is fixed at 24 bytes, shown in as twelve 16-bit words. The Packet Header consists of
10 contiguous fields in the following sequence:
14.3.1. Packet Sync Pattern.
A static sync value of 0xEB25 is used for every packet.
14.3.2. Channel ID.
This 2-byte field contains a value representing the Packet Channel ID. The Packet Header is generated using the
value stored in register 0x002E.
14.3.3. Packet Length.
This 32-bit field contains a value representing the length of the entire packet. The value indicates the number of bytes
in the packet, and is always a multiple of four (bits 1-0 are always 0-0). The Packet Length includes the Packet Header,
Channel Specific Data, Intra-Packet Headers, Data, Filler, and Data Checksum. (The HI-613x IMT does not generate
the optional Packet Secondary Header.)
14.3.4. Data Length.
This 32-bit field contains a value representing the valid data length within the packet, expressed in number of bytes.
Valid data length includes Channel Specific Data, Intra-Packet Data Headers, Intra-Packet Time Stamp(s), and Data,
but does not include the Packet Trailer Filler and Data Checksum.
14.3.5. Data Type Version.
This 8-bit field contains a value at or below the release version of the IRIG-106 standard applied to the data types in
the table below. The Packet Header is generated using the value encoded by bits 11-10 in register 0x0029. The Data
Type value is used in the Packet Header as shown below.
14.3.6. Sequence Number.
This 8-bit field contains a value representing the packet sequence number for each Channel ID. This is simply a
counter that increments to a maximum count of 0xFF, incrementing once for every packet transferred. After master
reset, the Sequence Number starts at 0x00. Upon reaching 0xFF, the Sequence Number rolls over to 0x00 and
continues counting.
14.3.7. Packet Flags.
This 8-bit field equals either 0x00 or 0x02, depending on the checksum type selected by bit 1 in register 0x0029. If Data
Register 0x0029
Bits 11-10
01
10
11
00
Data
Type
0x01
0x02
0x03
0x04
IRIG-106
IRIG-106-04 (original release)
IRIG-106-05 (default
IRIG-106-07
IRIG-106-09
HOLT INTEGRATED CIRCUITS
HI-6130, HI-6131
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