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PIIX3 Datasheet(PDF) 20 Page - Intel Corporation |
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PIIX3 Datasheet(HTML) 20 Page - Intel Corporation |
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20 / 122 page  82371FB (PIIX) AND 82371SB (PIIX3) E 20 1.13. Test Signals Signal Name Type Description TESTIN#/ APICREQ# (PIIX3 Only) I I 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 Type Description VCC Power (5 Volts): This pin is connected to the 5 volt power supply. VCC3 (PIIX3) 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. GND Ground: This pin is connected to the ground plane. |
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