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

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74
Pin Descriptions
Chapter 10
AMD Athlon™ XP Processor Model 6 Data Sheet
24309E—March 2002
Preliminary Information
For more information, see the “Required Circuits” chapter of
the
AMD Athlon™ Processor-Based Motherboard Design Guide
,
order# 24363.
VREFSYS Pin
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 and ZP Pins
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 Z
0
of the
transmission line. ZP is tied to VSS with a resistor that has a
resistance matching the impedance Z
0
of the transmission line.
Table 22.
VID[4:0] Code to Voltage Definition
VID[4:0]
VCC_CORE (V)
VID[4:0]
VCC_CORE (V)
00000
1.850
10000
1.450
00001
1.825
10001
1.425
00010
1.800
10010
1.400
00011
1.775
10011
1.375
00100
1.750
10100
1.350
00101
1.725
10101
1.325
00111
1.675
10111
1.275
01000
1.650
11000
1.250
01001
1.625
11001
1.225
01010
1.600
11010
1.200
01011
1.575
11011
1.175
01100
1.550
11100
1.150
01101
1.525
11101
1.125
01110
1.500
11110
1.100
01111
1.475
11111
No CPU