SPRUIV7B May 2022 – September 2023 AM620-Q1 , AM623 , AM625 , AM625-Q1 , AM625SIP
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 3). 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 3).
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 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 output clock (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.