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Chapter 7 Power and Signal Distribution
7.3.2 LOW VOLTAGE PRODUCTION/DISTRIBUTION
Voltages less than 3.3 VDC including processor core (VCore) voltage are produced through
regulator circuitry (Figure 7-4) on the system board.
igure 7-4. Low Voltage Supply and Distribution Diagram
pping of signals
ID4..0 by the processor. The possible voltages available are listed as follows:
+1.4 VDC
VCore
+12.8 VDC
+12.8 VDC
Driver Circuit C
PWM C
Driver Circuit B
Chipset
MOSFET
Finals
PWM B
PWM A
Driver Circuit A
+12.8 VDC
+12 VDC
+1.5 VDC
DDR DIMMs
1.5 / 1.4
Regulator
Circuit
3.3 AUX
DDR
S3 PWR
Circuit
2.6 VDC
3.3 AUX
1.2
Auxiliar y
Circuit
1.2 AUX
3.3 AUX [1]
+3.3 VDC
Chipset
+1.3 VDC
3.3
Auxiliar y
Circuit
DIMMs
+5 AUX
+5 VDC
Processor
VID0
VID1
VID2
VID3
VID4
+12.8 VDC
Regulator
Circuit
Power Supply
Processor
F
The regulator produces the VCore (processor core) voltage according to the stra
V
VID 4..0
VCore VID 4..0 VCore VID 4..0 VCore
00000 1.850 01011 1.575 10110 1.300
00001 1.825 01100 1.550 10111 1.275
00010 1.800 01101 1.525 11000 1.250
00011 1.775 01110 1.500 11001 1.225
00100 1.750 01111 1.475 11010 1.200
00101 1.725 10000 1.450 11011 1.175
00110 1.700 10001 1.425 11100 1.150
00111 1.675 10010 1.400 11101 1.125
01000 1.650 10011 1.375 11110 1.100
01001 1.625 10100 1.350 11111 Off
01010 1.600 10101 1.325 -- --
Compaq D315 and hp d325 Personal Computers
Featuring the AMD Athlon XP Processor
Second Edition - April 2003
7-8