Byte select access is used to connect one 16-bit device. In this mode, read/write operations can be enabled/disabled at byte level. One byte-select line per byte of the data bus is provided. One NRD and one NWE signal control read and write.
For 16-bit devices, the SMC provides NBS0 and NBS1 selection signals for respectively Byte0 (lower byte) and Byte1 (upper byte) of a 16-bit bus.
Figure 1. Connection of 2 × 8-bit Devices on a 16-bit Bus: Byte Write
Option
