GPMC_FCLK
GPMC_CLK
nBE1/nBE0
nCS
nADV
nOE
DIR
WAIT
Valid Address
Valid Address
Data 0
Data 0
OUT
IN
OUT
CSONTIME
CSRDOFFTIME
ADVONTIME
ADVRDOFFTIME
OEONTIME
OEOFFTIME
RDACCESSTIME
RDCYCLETIME
A[27:17]
A[16:1]/D[15:0]
Preliminary
Architecture
www.ti.com
5.2.4.10.1.1 Access on Address/Data Multiplexed Devices
5.2.4.10.1.1.1 Asynchronous Single-Read Operation on an Address/Data Multiplexed Device
shows an asynchronous single read operation on an address/data-multiplexed device.
Figure 5-12. Asynchronous Single Read Operation on an Address/Data Multiplexed Device
5.2.4.10.1.1.2 Asynchronous Single Read on an Address/Data-Multiplexed Device
See
for formulas to calculate timing parameters.
lists the timing bit fields to set up in order to configure the GPMC in asynchronous single
read mode.
When the GPMC generates a read access to an address/data-multiplexed device, it drives the address
bus until OE assertion time. For details, see
.
Address bits (A[16:1] from a GPMC perspective, A[15:0] from an external device perspective) are
placed on the address/data bus, and the remaining address bits GPMC_A[25:16] are placed on the
address bus. The address phase ends at OE assertion, when the DIR signal goes from OUT to IN.
•
Chip-select signal CS
–
CS assertion time is controlled by the GPMC_CONFIG2_i[3-0] CSONTIME field. It controls the
address setup time to CS assertion.
–
CS deassertion time is controlled by the GPMC_CONFIG2_i[12-8] CSRDOFFTIME field. It
controls the address hold time from CS deassertion
•
Address valid signal ADV
–
ADV assertion time is controlled by the GPMC_CONFIG3_i[3-0] ADVONTIME field.
–
ADV deassertion time is controlled by the GPMC_CONFIG3_i[[12-8] ADVRDOFFTIME field.
580
General-Purpose Memory Controller (GPMC)
SPRUGX9 – 15 April 2011
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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