hi-6131pqtf QuickLogic Corp, hi-6131pqtf Datasheet - Page 127

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

11 − 10
Bit No.
9 − 8
12
Mnemonic
GCHK
MTDTV1:0
MTTTB1:0
R/W
R/W
R/W
R/W
Reset
0
0
0
HOLT INTEGRATED CIRCUITS
Function
Gap Check.
When this bit equals 1, the IMT monitor evaluates inter-message gaps
and RT response times for a minimum preceding bus dead time of 2 µs.
This dead time corresponds to an inter-message gap of 4µs, measured
per MIL-STD-1553, from mid-parity zero crossing of the preceding
word, to mid-sync zero crossing of the following word. A minimum gap
time violation results in a Format Error in the Block Status Word for the
message.
When this bit equals 0 (recommended), the monitor does not check for
short inter-message gap times.
IMT Packet Header “Data Type Version”.
This IMT setting is only meaningful when MTHTD (register bit 3) equals
0, enabling automatic generation of IRIG-106 data packet header and
packet trailer.
The IRIG-106 Chapter 10 packet header contains an 8-bit field “Data
Type” field corresponding to the IRIG-106 version applied to the data.
Register bits 15-14 specify one of four Data Type values (0x01 – 0x04)
for insertion into the generated packet header:
This selection does not affect data encoding, only the 8-bit Data Type
code inserted into the IRIG-106 packet header.
Monitor Time Tag Message Bit Select.
This 2-bit field selects the bit within the MIL-STD-1553 message where
time stamp occurs. Time stamp occurs at mid-bit transition:
For options 00 and 10, the “Last Bit” precedes the word’s parity bit. For
option 01, the “First Bit” occurs 0.5µs after command sync. While “First
Word” generally denotes a command word, message recording can
begin with a data word when register bit 5 equals 1.
HI-6130, HI-6131
Bit 11:10
00
01
10
11
Bit 9:8
00
01
10
11
127
Header Data Type
Last Bit of Last Word in Message
First Bit of First (Command) Word in Message
Last Bit of First (Command) Word in Message
time tag disabled, stores time tag = 0
0x04
0x01
0x02
0x03
Time Tag Event
IRIG-106-05 (default)
IRIG Release
IRIG-106-09
IRIG-106-04
IRIG-106-07