5-1
CHAPTER 5DEVICE CONFIGURATION
The Intel386™ EX processor provides many possible signal to pin connections as well as periph-
eral to peripheral connections. This chapter describes the available configurat ions and how to
configure them.
This chapter is organized as follows:
•Introduction (see below)
•Peripheral Configuration (page 5-3)
•Pin Configuration (page 5-23)
•Device Configuration Procedure (page 5-28)
•Configuration Example (page 5-28)
5.1 INTRODUCTION
Device configuration is the process of setting up the microprocessor’s on-chip peripherals† for a
particular system design. Specifically, device configuration consists of programming registers to
connect peripheral signals to the package pins and interco nnect t he peri p heral s. The peri phe ral s
include the following:
•DMA Controller (DMA)
•Interrupt Control Unit (ICU)
•Timer/counter Unit (TCU)
•Asynchronous Serial I/O Units (SIO0, SIO1)
•Synchronous Serial I/O Unit (SSIO)
•Refresh Control Unit (RCU)
•Chip-select Unit (CSU)
•Watchdog Timer Unit (WDT)
In addition, the pin configuration registers control connectio ns fr om the coproce ssor t o t he c ore
and pin connections to the bus arbiter.
† In this chapter, the terms “peripheral” and “on-ch ip per ipheral” are used intercha ngeably. An “off-chip peripheral” is
external to the Intel386 EX processor.