Specifications

2–1
CHAPTER 2
HARDWARE CONFIGURATION
2.1 INTRODUCTION
This chapter covers configuring the Little Board/P5i and using on-board and peripheral devices. The
topics covered in this chapter are:
 Power and the power fail monitor
 256K Level-two synchronous cache
 DRAM memory
 RS232C serial ports, including Ampro interrupt sharing
 Enhanced parallel port
 Floppy disk interface
 PCI EIDE hard-disk interface
 32-pin byte-wide socket and OEM Flash memory
 UltraSCSI hard disk interface
 Flat-panel/CRT video interface
 Ethernet local area network interface
 Utility connector (Keyboard, PC speaker, reset button, external battery)
 Watchdog timer
 Battery-backed clock
 PC/104-Plus expansion bus
This chapter includes data on the board’s connector signals and pinouts, external device requirements,
interconnection cable wiring, and board configuration.
2.1.1 Interface Connector Summary
Refer to Figure 2-1 for the locations of the connectors (P1, P2, J3-J21) and configuration jumpers (W1–
W24). Table 2-1 summarizes the use of the I/O connectors and Table 2-2 summarizes use of the
configuration jumpers.
Each interface is described in its own section, showing connector pinouts, signal definitions, required
mating connectors, and configuration jumper options.
Many of the connectors have a key pin removed. This allows you to block the corresponding cable
connector socket to help prevent improper assembly. Table 2-1 indicates which pins are key pins, and
Figure 2-1 shows their locations.