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
