SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
For each chip-select configuration, the read access can be specified as asynchronous or synchronous access through the GPMC_CONFIG1_i[29] READTYPE bit (where i = 0 to 7). For each chip-select configuration, the write access can be specified as synchronous or asynchronous access through the GPMC_CONFIG1_i[27] WRITETYPE bit where (i = 0 to 7).
Asynchronous and synchronous read and write access time and related control signals are controlled through timing parameters that refer to GPMC_FCLK. The primary difference of synchronous mode is the availability of a configurable clock interface (GPMC_CLK) to control the external device. Synchronous mode also affects data-capture and wait-pin monitoring schemes in read access.
For more information about asynchronous and synchronous access, see the descriptions of GPMC_CLK, RdAccessTime, WrAccessTime, and wait pin monitoring.
For more information about timing-parameter settings, see the sample timing diagrams in this chapter.
The address bus and nBE[1:0] are fixed for the duration of a synchronous burst read access, but they are updated for each beat of an asynchronous page-read access.