Computer Hardware User's Guide

9-1
TMS320C30 and TMS320C31
External-Memory Interface
This chapter describes the ’C30 and ’C31 external-memory interface. See
Chapter 10,
Enhanced External-Memory Interface , for detailed information on
the ’C32 external bus operation.
Memories and external peripheral devices are accessible through two external
interfaces on the ’C30:
Primary bus
Expansion bus
On the ’C31, one bus, the primary bus, is available to access external memories
and peripheral devices. You can control wait-state generation, permitting access
to slower memories and peripherals, by manipulating memory-mapped control
registers associated with the interfaces and by using an external input signal.
Topic Page
9.1 Overview 9-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.2 Memory Interface Signals 9-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.3 Memory Interface Control Registers 9-7. . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.4 Programmable Wait States 9-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.5 Programmable Bank Switching 9-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.6 External Memory Interface Timing 9-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 9