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Preliminary
Architecture
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5.2.4.10.1.2.2 Asynchronous Single Read on an AAD-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
write mode.
When the GPMC generates a read access to an AAD-multiplexed device, all address bits are driven
onto the address/data bus in two separate phases. The first phase is used for the MSB address and is
qualified with OE driven low. The first address phase ends at the first OE deassertion time. The second
phase for LSB address is qualified with OE driven high. The second address phase ends at the second
OE assertion time, when the DIR signal goes from OUT to IN.
The CS and DIR signals are controlled in the same way as for asynchronous single read operation on
an address/data-multiplexed device.
•
Address valid signal ADV. ADV is asserted and deasserted twice during a read transaction:
–
ADV first assertion time is controlled by the GPMC_CONFIG3_i[6-4] ADVAADMUXONTIME
field.
–
ADV first deassertion time is controlled by the GPMC_CONFIG3_i[26-24]
ADVAADMUXRDOFFTIME field.
–
ADV second assertion time is controlled by the GPMC_CONFIG3_i[3-0] ADVONTIME field.
–
ADV second deassertion time is controlled by the GPMC_CONFIG3_i[12-8] ADVRDOFFTIME
field.
•
Output Enable signal OE. OE is asserted and deasserted twice during a read transaction (OE
second assertion indicates a read cycle):
–
OE first assertion time is controlled by the GPMC_CONFIG4_i[6-4] OEAADMUXONTIME field.
–
OE first deassertion time is controlled by the GPMC_CONFIG3_i[15-13] OEAADMUXOFFTIME
field.
–
OE second assertion time is controlled by the GPMC_CONFIG4_i[3-0] OEONTIME field.
–
OE second deassertion time is controlled by the GPMC_CONFIG4_i[12-8] OEOFFTIME field.
584
General-Purpose Memory Controller (GPMC)
SPRUGX9 – 15 April 2011
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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