SPRUJ79 November 2024 F29H850TU , F29H859TU-Q1
Figure 3-20 shows the program access bridge, which bridges the 128-bit bus of the CPU and the 64-bit bus of the LDx and CDx memories. The program access bridge is only active when the program access is issued to LDx and CDx memories. The bridge issues two 64-bit accesses in place of one 128-bit access from the CPU. Data is then locally buffered to accumulate 128-bits before returning to the CPU.
Program accesses to LPx and CPx memories bypass the program bridge and are transparent. If the address falls on the second half of the 128-bit word only one access is issued, with the lower 64 bits of the data word ignored by the CPU.