SB82371 Intel Corporation, SB82371 Datasheet - Page 20

• Manufacturer Part Number: SB82371
• Description: 82371FB (PIIX) AND 82371SB (PIIX3) PCI ISA IDE XCELERATOR
• Manufacturer: Intel Corporation

82371FB (PIIX) AND 82371SB (PIIX3)
1.13.
1.14.
20
TESTIN#/
APICREQ#
(PIIX3 Only)
VCC
VCC3
(PIIX3)
GND
Signal Name
Signal Name
Test Signals
Power and Ground Signals
I
I
Type
Type
TEST INPUT: This signal has two functions, depending on the
programming of the APIC Chip Select bit (XBCS Register). See the APIC
SIgnal Description for the APICREQ# function. The TESTIN# signal is used
in conjunction with the IRQ signals to select the various test modes of the
PIIX/PIIX3. This input contains an internal pull up resistor. After a hard
reset, this pin functions as a TESTIN# signal. An external weak pull-up
resistor (4.7k to 20k ohms) is required to 5V.
Power (5 Volts): This pin is connected to the 5 volt power supply.
Power (3.3 Volts): This pin is connected to the 3.3 volt power supply.
Note that, if the the Universal Serial Bus function is not used, this pin can
be connected to the 5 volt power supply.
Ground: This pin is connected to the ground plane.
Description
Description