Low Voltage Production/Distribution - HP Compaq D315 Technical Reference Manual

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