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]
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GPMC
7.1.3.3.10.1.1 Access on Address/Data Multiplexed Devices
7.1.3.3.10.1.1.1 Asynchronous Single-Read Operation on an Address/Data Multiplexed Device
Figure 7-12 shows an asynchronous single read operation on an address/data-multiplexed device.
Figure 7-12. Asynchronous Single Read Operation on an Address/Data Multiplexed Device
7.1.3.3.10.1.1.2 Asynchronous Single Read on an Address/Data-Multiplexed Device
See Section 7.1.3.9.1 for formulas to calculate timing parameters.
Table 7-41 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 OEn assertion time. For details, see Section 7.1.3.3.8.2.3.
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 OEn assertion, when the DIR signal goes from OUT to IN.
• Chip-select signal CSn
– CSn assertion time is controlled by the GPMC_CONFIG2_i[3-0] CSONTIME field. It controls the
address setup time to CSn assertion.
– CSn deassertion time is controlled by the GPMC_CONFIG2_i[12-8] CSRDOFFTIME field. It
controls the address hold time from CSn deassertion
• Address valid signal ADVn
– ADVn assertion time is controlled by the GPMC_CONFIG3_i[3-0] ADVONTIME field.
– ADVn deassertion time is controlled by the GPMC_CONFIG3_i[[12-8] ADVRDOFFTIME field.
281
SPRUH73H–October 2011–Revised April 2013 Memory Subsystem
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