GPMC_FCLK
GPMC_CLK
nBE1/nBE0
nCS
WAIT
nADV
nOE
DIR
A 0
A 1
A 2
A 3
A 4
D 0
D 1
D 2
D 3
D 3
OUT
IN
OUT
CSONTIME
ADVONTIME
OEONTIME
RDACCESSTIME
PAGEBURSTACCESSTIME
OEOFFTIME1
CSRDOFFTIME1
ADVRDOFFTIME0
CSRDOFFTIME0
RDCYCLETIME0
RDCYCLETIME1
OEOFFTIME0
PAGEBURSTACCESSTIME
PAGEBURSTACCESSTIME
gpmc_a[11:1]
gpmc_d[15:0]
connected to A[10:1] on
memory side)
connected to D[15:0] on
memory side)
gpmc-014
Public Version
General-Purpose Memory Controller
www.ti.com
Data is driven on the address/data bus at a
[19:16] WRDATAONADMUXBUS time.
NOTE:
Write multiple access in asynchronous mode is not supported. If WRITEMULTIPLE is
enabled with WRITETYPE as asynchronous, the GPMC processes single asynchronous
accesses.
10.1.5.9.3 Asynchronous Multiple (Page Mode) Read
shows an asynchronous multiple read operation.
Figure 10-14. Asynchronous Multiple (Page Mode) Read
NOTE:
The WAIT signal is active low.
In the following section i stands for the chip-select number, i = 0 to 7.
For read access with GPMC.
register settings:
•
READMULTIPLE bit at 1 (read multiple access)
•
READTYPE bit at 0 (read asynchronous)
•
MUXADDDATA bit at 0 (non-address/data-multiplexed device). The page mode is not supported by
address/data-multiplexed devices.
In
, two Word32 read host accesses on the GPMC configured with READMULTIPLE = 1,
READTYPE = 0, and MUXADDDATA = 0 are merged into one multiple-read access (page mode of four
Word16) on the attached device.
2146
Memory Subsystem
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated