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
A[27:1]
D[15:0]
Preliminary
Architecture
www.ti.com
5.2.4.10.3.3 Asynchronous Multiple (Page Mode) Read Operation on a Nonmultiplexed Device
shows an asynchronous multiple read operation on a Nonmultiplexed Device, in which two
word32 host read accesses to the GPMC are split into one multiple (page mode of 4 word16) read
access to the attached device.
Figure 5-26. Asynchronous Multiple (Page Mode) Read
The WAIT signal is active low.
CS, ADV, OE and DIR signals are controlled in the same way as address/data multiplexed accesses,
see
When RDACCESSTIME completes, control-signal timings are frozen during the multiple data
transactions, corresponding to PAGEBURSTACCESSTIME multiplied by the number of remaining data
transactions.
Read data is latched at GPMC_CONFIG5_i[20-16] RDACCESSTIME completion time (i = 0 to 7). The
end of the access is defined by the GPMC_CONFIG5_i[4-0] RDCYCLETIME parameter.
During consecutive accesses, the GPMC increments the address after each data read completes.
Delay between successive read data in the page is controlled by the GPMC_CONFIG5_i[27-24]
PAGEBURSTACCESSTIME parameter. Depending on the device page length, the GPMC can control
device page crossing during a burst request and insert initial RDACCESSTIME latency. Note that page
crossing is only possible with a new burst access, meaning a new initial access phase is initiated.
Total access time RDCYCLETIME corresponds to RDACCESSTIME plus the address hold time starting
from the CS deassertion.
•
The read cycle time is defined in the GPMC_CONFIG5_i[4-0] RDCYCLETIME field.
598
General-Purpose Memory Controller (GPMC)
SPRUGX9 – 15 April 2011
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
Страница 2: ...Preliminary 2 SPRUGX9 15 April 2011 Submit Documentation Feedback 2011 Texas Instruments Incorporated...
Страница 92: ...92 Read This First SPRUGX9 15 April 2011 Submit Documentation Feedback 2011 Texas Instruments Incorporated...
Страница 1122: ...1122 Multichannel Audio Serial Port McASP SPRUGX9 15 April 2011 Submit Documentation Feedback 2011 Texas Instruments Incorporated...
Страница 1562: ...1562 Real Time Clock RTC SPRUGX9 15 April 2011 Submit Documentation Feedback 2011 Texas Instruments Incorporated...
Страница 1658: ...1658 Timers SPRUGX9 15 April 2011 Submit Documentation Feedback 2011 Texas Instruments Incorporated...
Страница 1750: ...1750 UART IrDA CIR Module SPRUGX9 15 April 2011 Submit Documentation Feedback 2011 Texas Instruments Incorporated...
Страница 1984: ...1984 Universal Serial Bus USB SPRUGX9 15 April 2011 Submit Documentation Feedback 2011 Texas Instruments Incorporated...