Valid Address
Valid Address
Data
OUT
CSONTIME
CSWROFFTIME
ADVONTIME
ADVWROFFTIME
WEONTIME
WRDATAONADMUXBUS
WEOFFTIME
WRCYCLETIME
GPMC_FCLK
GPMC_CLK
gpmc_a[11:1]
gpmc_d[15:0]
nBE1/nBE0
nCS
nADV
nWE
DIR
WAIT
(connected to A [26:17] on memory side)
(connected to A [16:1] / D [15:0] on
memory side)
gpmc-017
Public Version
General-Purpose Memory Controller
www.ti.com
•
Total access time (GPMC.
[4:0] RDCYCLETIME) corresponds to RDACCESSTIME
plus the address hold time from nCS deassertion, plus time from RDACCESSTIME to
CSWROFFTIME.
•
Direction signal DIR:
DIR goes from OUT to IN at the same time as nOE assertion.
After a read operation, if no other access (read or write) is pending, the data bus is driven with the
previous read value. See
, Bus Keeping Support.
10.1.5.10.2 Synchronous Single Write
Figure 10-17. Synchronous Single Write on an Address/Data-Multiplexed Device
NOTE:
The WAIT signal is active low.
When the GPMC generates a write access to an address/data-multiplexed device, it drives the data bus
until WRDATAONADMUXBUS time (
The GPMC.
register settings (i = 0 to 7) are as follows:
•
WRITEMULTIPLE bit at 0 (write single access)
•
WRITETYPE bit at 1 (write synchronous)
•
MUXADDDATA bit at 1 (address/data-multiplexed device)
Address bits [16:1] are placed on the address/data bus at cycle-start time, and the remaining address bits
[26:17] are placed on the address bus.
The address phase ends at WRDATAONADMUXBUS.
The nCS, nADV, and nWE signals are controlled in the same way as nonmultiplexed accesses.
First data of the burst is driven on the address/data bus at WRDATAONADMUXBUS time.
2150
Memory Subsystem
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated
Содержание OMAP36 Series
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Страница 692: ...692 MPU Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 1084: ...1084 IVA2 2 Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 1990: ...1990 2D 3D Graphics Accelerator SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2334: ...2334 Memory Subsystem SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2700: ...2700 Memory Management Units SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2868: ...2868 HDQ 1 Wire SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 2974: ...2974 UART IrDA CIR SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3054: ...3054 Multichannel SPI SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3462: ...3462 MMC SD SDIO Card Interface SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3508: ...3508 General Purpose Interface SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3584: ...3584 Initialization SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...
Страница 3648: ...3648 Debug and Emulation SWPU177N December 2009 Revised November 2010 Copyright 2009 2010 Texas Instruments Incorporated ...