SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
In asynchronous write mode, the GPMC_CONFIG6_i[28-24] WRACCESSTIME timing parameter is not used to define the effective write access time. Instead, it is used as a wait invalid timing window and must be set to a correct value so that the GPMC_WAIT pin is at a valid state two GPMC output clock cycles before WRACCESSTIME completes. For more information about wait monitoring, see Section 12.3.4.3.7.3.1, WAIT Pin Monitoring Control.
In synchronous write mode, for single or burst accesses, WRACCESSTIME defines the number of GPMC_FCLK cycles from the start access time to the GPMC output clock rising edge used by the memory device for the first data capture.
The external WAIT signal can be used in conjunction with WRACCESSTIME to control the effective memory device data-capture GPMC output clock edge for a synchronous write access. For more information about wait monitoring, see Section 12.3.4.3.7.3.1, WAIT Pin Monitoring Control.