SB82371 Intel Corporation, SB82371 Datasheet - Page 122

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

82371FB (PIIX) AND 82371SB (PIIX3)
Figure 13 is a schematic of the NAND tree circuitry.
NAND Tree Timing Requirements
Allow 500 ns for the input signals to propagate to the NAND tree outputs (input-to-output propagation delay
specification).
5.3.
The TESTIN# signal must be 0 and IRQ’s 7, 6, and 5 must be 1 to enter the tri-state test mode. When in the
tri-state test mode, all outputs and bi-directional pins are tri-stated, including the NAND tree outputs.
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Tri-state Mode
MDRQ1
MDRQ0
RSTDRV
DREQ1
KBCCS#
XOE#
Figure 13. NAND Tree Circuitry
NAND CHAIN
SELECT
DACK1#
NAND CHAIN
SELECT
XDIR
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DACK1#
XDIR
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