82371FB Datasheet, PDF (20/122 Pages) Intel Corporation – 82371FB (PIIX) AND 82371SB (PIIX3) PCI ISA IDE XCELERATOR

82371FB (PIIX) AND 82371SB (PIIX3)
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1.13. Test Signals
Signal Name
TESTIN#/
APICREQ#
(PIIX3 Only)
Type
I
I
Description
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.
1.14. Power and Ground Signals
Signal Name
VCC
VCC3
(PIIX3)
GND
Type
Description
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.
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