HI-6121PQMF HOLTIC [Holt Integrated Circuits], HI-6121PQMF Datasheet - Page 55

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

PING-PONG DATA BUFFERING, Cont.
Following reset (which resets Control Word DPB bit), the subaddress transacts 4 commands of 32 data words each.
The NOTICE 2 option is enabled so the device segregates data from broadcast and non-broadcast messages.
Message #2 is a broadcast command, while the other three messages are non-broadcast. Notice that the broadcast
message does not affect DPB bit, but the following message resets BCAST bit. The interspersed broadcast command
does not affect alternation between Buffer A and Buffer B.
Increasing
Address
Memory
Data Buffer B
Data Buffer A
Subaddress
Subaddress
Subaddress
Data Buffer
Broadcast
Assigned
Assigned
Assigned
Figure 12. Ping-Pong Buffer Mode Example for a Receive Subaddress
Receive Subaddress
B’cast Data Pointer
Time-Tag Word BC
Descriptor Block
Msg Info Word BC
Time-Tag Word B
Data Words 2-31
Data Words 2-31
Data Words 2-31
Time-Tag Word A
Msg Info Word B
Msg Info Word A
Data Pointer B
Data Pointer A
Data Word 32
Data Word 32
Data Word 32
Control Word
Data Word 1
Data Word 1
Data Word 1
for a
HOLT INTEGRATED CIRCUITS
HI-6120, HI-6121
0x0565
0x0547 - 0x0564
0x0546
0x0545
0x0544
0x0543
0x0525 - 0x0542
0x0524
0x0523
0x0522
0x0521
0x0503 - 0x0520
0x0502
0x0501
0x0500
RAM
Address
Broadcast Data Pointer = 0x0544
Data Pointer B = 0x0522
Data Pointer A = 0x0500
Control Word = 0x2010
Initialized Descriptor Values
55
Device sets Control Word DPB bit
Receive Message #1
Non-Broadcast, 32 Data Words
Message #4 also uses
this buffer, if not broadcast
Device sets Control Word BCAST bit
(DPB bit remains static)
IBRD interrupt is generated
Receive Message #2
Broadcast, 32 Data Words
Device resets Control Word
DPB and BCAST bits
Receive Message #3
Non-Broadcast, 32 Data Words
Buffer B start address in RAM
Buffer A start address in RAM
Ping-Pong Mode, IBRD Interrupt
start address in RAM