Texas Instruments OMAP36 Series, Technical Reference Manual

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General-Purpose Memory Controller
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Bits Field Name Description Type Reset
31:1 RESERVED Write 0s for future compatibility. Read returns 0s. RW 0x00000000
0 STARTENGINE Resets the FIFO pointer and starts the engine RW 0x0
Read 0x0: Engine is stopped
Write 0x0 stops the engine
Read 0x1: Engine is running
Write 0x1 resets the FIFO pointer to 0x0 in prefetch mode and 0x40
in postwrite mode and starts the engine
Table 10-74. Register Call Summary for Register GPMC_PREFETCH_CONTROL
General-Purpose Memory Controller
• NAND Device Basic Programming Model : [0] [1] [2] [3] [4] [5] [6]
• GPMC Register Summary : [7]
Table 10-75. GPMC_PREFETCH_STATUS
Address Offset 0x0000 01F0
Physical Address 0x6E00 01F0 Instance GPMC
Description Prefetch engine status
Type RW
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
FIFOPOINTER RESERVED COUNTVALUE
RESERVED RESERVED
FIFOTHRESHOLDSTATUS
Bits Field Name Description Type Reset
31 RESERVED Write 0s for future compatibility. Read returns 0. RW 0x0
30:24 FIFOPOINTER Number of available bytes to be read or number of free R 0x00
empty byte places to be written
0x00: 0 byte available to be read or 0 free empty place to be
written
...
0x40: 64 bytes available to be read or 64 empty places to
be written
23:17 RESERVED Write 0s for future compatibility. Read returns 0s. RW 0x00
16 FIFOTHRESHOLDSTATUS Set when FIFOPointer exceeds FIFOThreshold value R 0x0
0x0: FIFOPointer smaller or equal to FIFOThreshold. Writing
to this bit has no effect
0x1: FIFOPointer greater than FIFOThreshold. Writing to
this bit has no effect
15:14 RESERVED Write 0s for future compatibility. Read returns 0s. RW 0x0
13:0 COUNTVALUE Number of remaining bytes to be read or to be written by the R 0x0000
engine according to the TransferCount value
0x0000: 0 byte remaining to be read or to be written
0x0001: 1 byte remaining to be read or to be written
...
0x2000: 8 Kbytes remaining to be read or to be written
2216 Memory Subsystem SWPU177N – December 2009 – Revised November 2010
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