82C862 Datasheet, PDF (51/51 Pages) List of Unclassifed Manufacturers – FireLink USB Dual Controller Quad Port USB

FireLink USB
82C862
8.0 NAND Tree Test Mode
The NAND tree mode tests both input and bi-directional pins that are part of the NAND tree chain. The NAND tree chain starts
at pin 21 (TEST0) while the output of the chain is at pin 4 (AD0).
To enable the NAND tree test mode, strap FireLink 2.0 by pulling up the following pins during the rising edge of RESET#: Pin
25 (TEST1) and Pin 21 (TEST0). For reliable strapping, toggle PCICLK at least two times after RESET# goes low, and at least
two times after RESET# goes high. After that strapping sequence, set both RESET# and PCICLK high. Do not toggle RESET#
and PCICLK during the NAND tree test.
Once in NAND tree mode, all pins together form the inputs to a NAND gate, with AD0 becoming the output of the NAND gate.
912-2000-030
Revision 1.0
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