hi-6131pqtf QuickLogic Corp, hi-6131pqtf Datasheet - Page 78

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

Bit No.
4
3
2
Mnemonic
BCWDTE
TTSYNEN
ETTSYN
R/W
R/W
R/W
R/W
Reset
0
0
0
HOLT INTEGRATED CIRCUITS
Function
BC Watchdog Timer (WDT) Enabled.
When this bit is logic 1, if the End of Frame (EOF) interrupt bit is set
in the BC Interrupt Enable register, the BC sets the EOF bit in the BC
Pending Interrupt register when the BC Frame Timer decrements from 1
to 0.
When using this feature, it is necessary to periodically reload the Frame
Time register by means of the LFT Load Frame Time op code in the BC
message sequence control block. The loaded value must allow for the
worst-case frame time (including message retries). The WDT provides
a failsafe recovery from faults such as message sequence stuck in
repetitive loop without LFT reload, or execution jumping to the wrong
sequence.
BC Time Tag Synchronization Enable
This option bit only affects the “synchronize with data” mode code
command, MC17. When this bit is logic 1, the source of the mode
data issued with the “synchronize” mode command is determined by
message BC Control Word TXTTMC17 bit 15 (see Section 10.4.1)
If the TTSYNEN bit is logic 0, regardless of the state of message
Control Word bit 15, the “synchronize with data” mode command
(MC17) is always issued with mode data originating from the message
data block, at the RAM address indicated by the Data Address Pointer
word.
Even Time Tag Sync.
This bit only applies when TTSYNEN bit 3 is logic 1 and BC Control
Word TXTTMC17 bit 15 is also logic 1, selecting “synchronize” mode
data origin as time base counter. In this case, if ETTSYN is logic 1,
the transmitted time tag data word is always even; the low order bit is
always 0. When the ETTSYN bit is logic 0, the data word may be even
or odd; the LSB may be 0 or 1.
•
•
HI-6130, HI-6131
If BC Control Word TXTTMC17 bit 15 = logic 0, the “synchronize”
mode data word originates from the message data block, at the
RAM address indicated by the Data Address Pointer word.
If BC Control Word TXTTMC17 bit 15 = logic 1, the “synchronize”
mode data word value originates from the 16-bit BC time base
counter (or the low order 16 bits, when using the 32-bit BC time
base option). The transmitted data value is saved in the message
data block, at the address indicated by the Data Address Pointer
word.
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