14.5.4.2.1 Input Data Transfer (all commands)

At the beginning of any command, the host should drive the DATA[15:0] lines and release the #OE line.

If the host has to send an input data, then it must set the proper value on the DATA[15:0] lines (and on the MODE[2:0] lines) before it starts a new command by lowering the #CMD line. Also, similar to the MODE[2:0] lines, the host must maintain the value on the DATA[15:0] lines until it detects a falling edge on the RDY line. The target device always samples the DATA[0:15] lines to read the input data at the same time as it samples the #CMD and #MODE[2:0] lines, just before lowering the RDY line.