GPMC
Table 7-75. GPMC_PREFETCH_CONFIG1 Field Descriptions (continued)
Bit
Field
Value
Description
14-8
FIFOTHRESHOLD
Selects the maximum number of bytes read from the FIFO or written to the FIFO
by the host on a DMA or interrupt request
0
0 byte
1h
1 byte
⋮
⋮
40h
64 bytes
7
ENABLEENGINE
Enables the Prefetch Postwite engine
0
Prefetch Postwrite engine is disabled
1
Prefetch Postwrite engine is enabled
6
Reserved
0
Reserved
5-4
WAITPINSELECTOR
Select which WAIT pin edge detector should start the engine in synchronized
mode
0
Selects Wait0EdgeDetection
1h
Selects Wait1EdgeDetection
2h
Reserved
3h
Reserved
3
SYNCHROMODE
Selects when the engine starts the access to CS
0
Engine starts the access to CS as soon as STARTENGINE is set
1
Engine starts the access to CS as soon as STARTENGINE is set AND wait to
non wait edge detection on the selected wait pin
2
DMAMODE
Selects interrupt synchronization or DMA request synchronization
0
Interrupt synchronization is enabled. Only interrupt line will be activated on FIFO
threshold crossing.
1
DMA request synchronization is enabled. A DMA request protocol is used.
1
Reserved
0
Reserved
0
ACCESSMODE
Selects pre-fetch read or write posting accesses
0
Prefetch read mode
1
Write-posting mode
387
SPRUH73H – October 2011 – Revised April 2013
Memory Subsystem
Copyright © 2011–2013, Texas Instruments Incorporated