Texas Instruments AM335 Series Technical Reference Manual

GPMC_FCLK
GPMC_CLK
WAIT
Valid Address
Valid Address Data
CSONTIME
CSWROFFTIME
ADVONTIME
ADVWROFFTIME
WEONTIME
WRDATAONADMUXBUS
WEOFFTIME
WRCYCLETIME
nBE1/nBE0
nCS
nADV
nWE
A[27:17]
A[16:1]/D[15:0]
DIR
OUT
www.ti.com GPMC
7.1.3.3.10.1.1.3 Asynchronous Single Write Operation on an Address/Data-Multiplexed Device
Figure 7-14 shows an asynchronous single write operation on an address/data-multiplexed device.
Figure 7-14. Asynchronous Single Write on an Address/Data-Multiplexed Device
7.1.3.3.10.1.1.4 Asynchronous Single Write 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 write
mode. When the GPMC generates a write access to an address/data-multiplexed device, it drives the
address bus until WEn assertion time. For more information, see Section 7.1.3.3.8.2.3.
The CSn and ADVn signals are controlled in the same way as for asynchronous single read operation on
an address/data-multiplexed device.
• Write enable signal WEn
– WEn assertion indicates a write cycle.
– WEn assertion time is controlled by the GPMC_CONFIG4_i[19-16] WEONTIME field.
– WEn deassertion time is controlled by the GPMC_CONFIG4_i[28-24] WEOFFTIME field.
• Direction signal DIR: DIR signal is OUT during the entire access.
• The end of the access is defined by the GPMC_CONFIG5_i[12-8] WRCYCLETIME parameter.
Address bits A[16:1] (GPMC point of view) are placed on the address/data bus at the start of cycle time,
and the remaining address bits A[26:17] are placed on the address bus.
Data is driven on the address/data bus at a GPMC_CONFIG6_i[19-16] WRDATAONADMUXBUS time.
Write multiple access in asynchronous mode is not supported. If WRITEMULTIPLE is enabled with
WRITETYPE as asynchronous, the GPMC processes single asynchronous accesses.
283
SPRUH73H–October 2011–Revised April 2013 Memory Subsystem
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Texas Instruments AM335 Series Specifications

General

Brand	Texas Instruments
Model	AM335 Series
Category	Computer Hardware
Language	English