Instruction Manual

Chapter 2 Product Overview
ETX-PVR Reference Manual 9
Figure 2-4. Component Locations (Top Side)
Temperature
Sensor (U20 - on
bottom side) [see
Figure 2-4 on
page 9]
ON Semi ADT7481ARMZ Digital thermometer and
under/over alarm for local,
CPU, and I/O Hub
temperatures
Measures its
own ambient
temperature and
the temperature
outputs of the
CPU and I/O
Hub. Provides
under/over
temperature
alarm.
CPLD (U22) Xilinx XC9536XL Complex Programmable
Logic Device (not user
programmable)
Provides control
for Power
Sequencing
SPI Flash (U37)
[see Figure 2-5 on
page 10]
PCT PCT25VF016B Serial Peripheral Interface
Flash memory chip
(firmware)
Stores BIOS in
Flash memory
Table 2-1. Major Components Descriptions and Functions (Continued)
Key:
U1 - CPU
U2 - I/O Hub (Southbridge)
U8 - PCI-to-ISA Bridge
U20 - Temperature Sensor
U22 - CPLD
U1
U2
U8
ETX-PVR_Top_Comp_b
U22
U20