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Technical Reference Guide
Compaq iPAQ Family of Internet Devices
First Edition - March 2000
2-13
2.4.3 SUPPORT COMPONENTS
Input/output functions not provided by the chipset are handled by other support components.
Some of these components also provide “housekeeping” and various other functions as well.
Table 2-4 shows the functions provided by the support components.
Table 2-4.
Support Component Functions
Table 2-4.
Support Component Functions
Component Name Function Notes
LPC47B277 I/O Controller Keyboard and pointing device I/F
Diskette I/F
Serial I/F
Parallel I/F
AGP, PCI reset generation
ISA serial IRQ converter
Power button logic
Slow speed detection
S3 regulator controller
GPIO ports
[1]
[2]
[1]
[1]
AD1881 Audio Codec Audio mixer
Digital-to-analog converter
Analog-to-digital converter
Analog I/O:
Mic input
Line input
CD input
Line output
82559 Ethernet Controller [1] Network interface controller
PHY interface
NOTE:
[1] Implemented on legacy-light models only.
[2] Not available for actual use but may be enabled to satisfy OS requirements.
2.4.4 SYSTEM MEMORY
These systems utilize Synchronous DRAM (PC100 SDRAM, non-ECC only). Two DIMM
sockets are provided and accessible through an access opening once the right side cover has been
removed.