hi-6131pqtf QuickLogic Corp, hi-6131pqtf Datasheet - Page 228

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

---- <data> data from 0x0403 (SCK continues afterward, Control Word next)
---- <data> data from 0x0403 (SCK continues afterward, Control Word next)
---- <data> data from 0x0403 (SCK stops and /CS is then negated)
Using a different SPI op code sequence, the host can read the entire RT1 Descriptor Table without getting stuck at the
first Control Word read by the multi-word transfer using op code 0x40:
FROM
HOST
===== ======= ==========================================
0xD8
0x8B
0x03FF ---- decremented table start addr 0x0400 - 1 written to MAP
0xD0
0x40
---- <data> data from 0x0400 (SCK continues afterward)
---- <data> data from 0x0401 (SCK continues afterward)
---- <data> data from 0x0402 (SCK continues afterward)
---- <data> data from 0x0403 (SCK stops and /CS is negated)
0xD0
0x40
---- <data> data from 0x0404 (SCK continues afterward)
---- <data> data from 0x0405 (SCK continues afterward)
---- <data> data from 0x0406 (SCK continues afterward)
---- <data> data from 0x0407 (SCK stops and /CS is negated)
0xD0
0x40
---- <data> data from 0x0408 (SCK continues afterward)
---- <data> data from 0x0409 (SCK continues afterward)
---- <data> data from 0x040A (SCK continues afterward)
---- <data> data from 0x040B (SCK stops and /CS is negated)
The host may repeat this sequence until the entire RT1 Descriptor Table is read. The repeating read process is not
shown, but the sequence could end like this, stopping at the upper table boundary…
0xD0
0x40
---- <data> data from 0x05FC (SCK continues afterward)
---- <data> data from 0x05FD (SCK continues afterward)
---- <data> data from 0x05FE (SCK continues afterward)
---- <data> data from 0x05FF (SCK stops and /CS is negated) TABLE ENDS
In most situations, the repeating op code block (0xD0 with 8 SCK clocks and op code 0x40 with 72 SCK clocks) would
be implemented as a loop, rather than straight-line code. A total of 128 loop repetitions would be required to read the
RT Descriptor Table from start to finish.
FROM
HI-6131
---- SPI op enables memory address pointer (MAP) 0x000B.
---- op code writes memory address pointer (MAP)
---- op code increments enabled MAP
---- op code reads MAP-addressed location
---- op code increments enabled MAP
---- op code reads MAP-addressed location
---- op code increments enabled MAP
---- op code reads MAP-addressed location
---- op code increments enabled MAP
---- op code reads MAP-addressed location
COMMENT
HOLT INTEGRATED CIRCUITS
HI-6130, HI-6131
228