Texas Instruments TMS320C3x - Manual (Page 290)

External Memory Interface Timing
9-24
Figure 9–13 through Figure 9–23 illustrate the various transitions between
memory reads and writes, and I/O writes over the expansion bus.
Figure 9–13. Memory Read and I/O Write for Expansion Bus
H3
H1
XA
XD
XR/W
IOSTRB
MSTRB
XRDY
Memory address I/O address
Read I/O write