SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
For formulas to calculate timing parameters, see Section 12.3.4.4.6.1, GPMC Timing Parameters Formulas.
Table 12-206 lists the timing bit fields to set up 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 nWE assertion time. For more information, see Section 12.3.4.3.7.2.3, Address/Data-Multiplexing Interface.
The nCS and nADV signals are controlled in the same way as for a asynchronous single-read operation on an address/data-multiplexed device.
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 are placed on the address bus.
Data is driven on the address/data bus at a GPMC_CONFIG6_i[19-16] WRDATAONADMUXBUS time.
Multiple write access in asynchronous mode is not supported. If WRITEMULTIPLE is enabled with WRITETYPE as asynchronous, the GPMC processes single asynchronous accesses.
After a write operation, if no other access (read or write) is pending, the data bus keeps its previous value. See Section 12.3.4.3.8.10, Bus Keeping Support.