HI-6121PQMF HOLTIC [Holt Integrated Circuits], HI-6121PQMF Datasheet - Page 53

• Manufacturer Part Number: HI-6121PQMF
• Description: MIL-STD-1553 Remote Terminal ICs
• Manufacturer: HOLTIC [Holt Integrated Circuits]

PING-PONG DATA BUFFERING, Cont.
Message processing alternates between Data Buffers A and B. Upon successful message completion, the DPB bit in
Descriptor Control Word is updated so next message uses other buffer. Buffers are overwritten every other message.
Separate buffer for broadcast messages is optional. There is no alternate buffer for successive broadcast messages.
Memory Address for the Applicable
Subaddress Block is Derived From
the Decoded Command Word
Increasing
(if NOTICE2 is asserted)
Address
Memory
Broadcast Message
Figure 11. Illustration of Ping-Pong Buffer Mode
HOLT INTEGRATED CIRCUITS
Message Info Word
B’cast Data Pointer
Descriptor Block
Data Words 2-31
for Subaddress
Time-Tag Word
for Broadcast
Data Pointer B
Data Word 32
Buffer Space
Data Pointer A
Subaddress
Control Word
HI-6120, HI-6121
Data Word 1
(Optional)
53
Message #2
Message #4
Message #6
Message #1
Message #3
Message #5
etc.
etc.
Message Info Word
Message Info Word
Data Words 2-31
Data Words 2-31
Time-Tag Word
Time-Tag Word
Data Buffer A
Data Buffer B
Data Word 32
Data Word 32
Subaddress
Subaddress
Data Word 1
Data Word 1
Assigned
Assigned