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Chapter 6 Power and Signal Distribution
Compaq Deskpro EXS and Workstation 300 Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition - December 2000
6-6
6.3.2 LOW VOLTAGE PRODUCTION/DISTRIBUTION
Voltages less than 3.3 VDC including processor core (VccP) voltage are produced through
regulator circuitry on the system board.
Figure 6–3. Low Voltage Supply and Distribution Diagram
The VccP regulator produces the VccP (processor core) voltage according to the strapping of
signals VID4..0 by the processor. The possible voltages available are listed as follows:
VID 4..0 VccP VID 4..0 VccP VID 4..0 VccP
00000 2.05 VDC 01011 1.50 VDC 10110 2.90 VDC
00001 2.00 VDC 01100 1.45 VDC 10111 2.80 VDC
00010 1.95 VDC 01101 1.40 VDC 11000 2.70 VDC
00011 1.90 VDC 01110 1.35 VDC 11001 2.60 VDC
00100 1.85 VDC 01111 1.30 VDC 11010 2.50 VDC
00101 1.80 VDC 10000 3.50 VDC 11011 2.40 VDC
00110 1.75 VDC 10001 3.40 VDC 11100 2.30 VDC
00111 1.70 VDC 10010 3.30 VDC 11101 2.20 VDC
01000 1.65 VDC 10011 3.20 VDC 11110 2.10 VDC
01001 1.60 VDC 10100 3.10 VDC 11111 No CPU
01010 1.55 VDC 10101 3.00 VDC -- --
VccP (see text)
Regulator
Circuit
+12 VDC
VID0
Processor
VID1
VID2
VID3
Power Supply
+5 VDC
+3.3 VDC
+5 AUX
RIMMs
3.3
RIMM
Circuit
3.3 VDC
+3 AUX
RIMM
Power
Circuitry
2.5 S3 VDC
Processor
+1.8 VDC
+5 VDC
AGP
PWR
VDDQ (1.5 VDC)
AGP Bus
VID4
+12 VDC
+3.3 VDC
+1.4 Ref
RIMMs
+12.8 Vcpu