AMD AX2000DMT3C User Guide - Page 86
VREFSYS Pin, ZN and ZP Pins, AMD Athlon™ Processor-Based Motherboard Design Guide, Design Guide - athlon cpu
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Preliminary Information AMD Athlon™ XP Processor Model 6 Data Sheet 24309E-March 2002 VREFSYS Pin ZN and ZP Pins Table 22. VID[4:0] Code to Voltage Definition VID[4:0] VCC_CORE (V) VID[4:0] VCC_CORE (V) 00000 00001 00010 00011 00100 00101 00111 01000 01001 01010 01011 01100 01101 01110 01111 1.850 1.825 1.800 1.775 1.750 1.725 1.675 1.650 1.625 1.600 1.575 1.550 1.525 1.500 1.475 10000 10001 10010 10011 10100 10101 10111 11000 11001 11010 11011 11100 11101 11110 11111 1.450 1.425 1.400 1.375 1.350 1.325 1.275 1.250 1.225 1.200 1.175 1.150 1.125 1.100 No CPU For more information, see the "Required Circuits" chapter of the AMD Athlon™ Processor-Based Motherboard Design Guide, order# 24363. VREFSYS (W5) drives the threshold voltage for the system bus input receivers. The value of VREFSYS is system specific. In addition, to minimize VCC_CORE noise rejection from VREFSYS, include decoupling capacitors. For more information, see the AMD Athlon™ Processor-Based Motherboard Design Guide, order# 24363. ZN (AC5) and ZP (AE5) are the push-pull compensation circuit pins. In Push-Pull mode (selected by the SIP parameter SysPushPull asserted), ZN is tied to VCC_CORE with a resistor that has a resistance matching the impedance Z0 of the transmission line. ZP is tied to VSS with a resistor that has a resistance matching the impedance Z0 of the transmission line. 74 Pin Descriptions Chapter 10