hi-6131pqtf QuickLogic Corp, hi-6131pqtf Datasheet - Page 116

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

14.5.1. Channel Specific Data.
This 32-bit field occurs once per packet and precedes the packet channel data. The Channel Specific Data is comprised
of the following fields:
Bits 31-30 indicate the MIL-STD-1553 data bit at which Intra-Packet Header time stamp occurs for each message:
Bits 23-0 indicate the binary count for the number of MIL-STD-1553 messages included in the packet. An integral
number of complete transaction messages will be in each packet
For each monitored MIL-STD-1553 message, three data fields are stored in the Packet Body. These are shown in
Figure 10, and explained here:
14.5.2. IRIG-106 Intra-Packet Time Stamp.
This 64-bit field contains a 48-bit Relative Time Counter value that marks the relative reception time for the MIL-
STD-1553 message. The high order 16 bits always equal 0x0000. Time stamping occurs at the message bit indicated
in the Channel Specific Data.
14.5.3. IRIG-106 Intra-Packet Data Header.
This 48-bit field is comprised of the following sub fields:
14.5.4. IRIG-106 Message Data.
This variable length block stores all MIL-STD-1553 message words in the order received. The number of words stored
depends on the MIL-STD-1553 message type, ranging from 1 word stored (for a broadcast mode code command
without data), to 36 words stored for an RT-to-RT message. Refer to Figure 10. An IRIG-106 packet typically contains
numerous MIL-STD-1553 messages, although the standard states the packet must contain at least one message (no
Block Status Word (BSW). This 16-bit word indicates status for the following MIL-STD-1553 message and indi-
cates MIL-STD-1553 bus protocol errors.
Response Time Word. This 16-bit word contains two 8-bit fields. For all messages except RT-to-RT, the GAP1
byte indicates the RT response time. For RT-to-RT messages, the GAP1 byte indicates the Transmit RT response
time, and the GAP2 byte indicates the Receive RT response time:
For both gap measurements, response time is measured consistently with MIL-STD-1553 definition, from the
mid-parity zero crossing of the preceding word, to the mid-sync zero crossing of the RT Status Word. For both,
the resolution is 100 ns per LSB, with a maximum time value of 25.5 µs.
Message Length Word. This 16-bit word indicates the number of bytes in the following message data block,
ranging from 2 to 72 bytes, for 1 to 36 stored 16-bit words.
00 = time stamp occurs at the last bit of the last word in the message
01 = time stamp occurs at the first bit of the first word in the message
10 = time stamp occurs at the last bit of the first word in the message
11 = reserved, not used
Bits 31-30
Time Tag Bits
HOLT INTEGRATED CIRCUITS
Bits 29-24
Reserved, always 000000
HI-6130, HI-6131
Bits 15-8
GAP2
116
Bits 7-0
GAP1
Bits 23-0
Message Count