39.7.3 Signal Multiplexing

Depending on the byte access type (BAT), only the byte write signals or the byte select signals are used. To save I/Os at the external bus interface, control signals at the EBI interface are multiplexed. The following table shows signal multiplexing depending on the data bus width and the byte access type.

For32-bit devices, bits A0 and A1 are unused. For 16-bit devices, bit A0 of address is unused. When the Byte Select option is selected, NWR1 to NWR3 are unused. When the Byte Write option is selected, NBS0 to NBS3 are unused.