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CHAPTER 5
DEVICE 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 configurations 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 interconnect the peripherals. The peripherals
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 connections from the coprocessor to the core
and pin connections to the bus arbiter.
†
In this chapter, the terms “peripheral” and “on-chip peripheral” are used interchangeably. An “off-chip peripheral” is
external to the Intel386 EX processor.