SPRUJ53B April 2024 – September 2024 TMS320F28P550SJ , TMS320F28P559SJ-Q1
Standard read mode is the default Flash read mode after reset. In this mode, the code prefetch mechanism and data cache are disabled. When standard read mode is active, every read access to Flash is decoded by the Flash wrapper to fetch the data from the addressed location, and the data is returned after RWAIT+1 cycles (except User OTP).
Flash data buffers associated with the prefetch mechanism and data cache are bypassed in standard read mode; therefore, every access to the Flash/OTP is used by the CPU immediately, and every access creates a unique Flash bank access.
Standard read mode is the recommended mode for lower system frequency operation, where RWAIT can be set to zero to provide single-cycle access operation. The Flash wrapper can operate at higher frequencies using standard read mode, at the expense of adding wait states. At higher system frequencies, it is recommended to enable the data cache and prefetch mechanisms to improve performance. Refer to the device data sheet to determine the maximum Flash frequency allowed in standard read mode (that is, maximum Flash clock frequency with RWAIT = 0, FCLKMAX).