Computer Hardware User's Guide

Overview
9-2
9.1 Overview
The ’C30 provides two external interfaces: the primary bus and the expansion
bus. The TMS320C31 provides one external interface: the primary bus. The
primary bus consists of a 32-bit data bus, a 24-bit address bus, and a set of
control signals. The expansion bus consists of a 32-bit data bus, a 13-bit
address bus, and a set of control signals. Each interface has the following
features:
Separate configurations controlled by memory-mapped external interface
control registers
Hold request and acknowledge signal for putting the external memory inter-
face signals in high impedance mode and preventing the processor from
accessing the external bus
Selectable wait state that can be controlled through software, hardware,
or combination of software and hardware
Unified memory space for data, program, and I/O access