Intel Pentium 4 672 HH80547PG1122MH User Manual
Product codes
HH80547PG1122MH
Intel
®
Pentium
®
4 Processor in the 423-pin Package
13
2.4.1
Phase Lock Loop (PLL) Power and Filter
V
CCA
and V
CCIOPLL
are power sources required by the PLL clock generators on the Pentium 4
processor silicon. Since these PLLs are analog in nature, they require quiet power supplies for
minimum jitter. Jitter is detrimental to the system: it degrades external I/O timings as well as
internal core timings (i.e., maximum frequency). To prevent this degradation, these supplies must
be low pass filtered from V
minimum jitter. Jitter is detrimental to the system: it degrades external I/O timings as well as
internal core timings (i.e., maximum frequency). To prevent this degradation, these supplies must
be low pass filtered from V
CC
. A typical filter topology is shown in Figure 1.
The AC low-pass requirements, with input at V
CC
and output measured across the capacitor (C
A
or
C
IO
in Figure 1), is as follows:
Table 2. Voltage Identification Definition
Processor Pins
VID4
VID3
VID2
VID1
VID0
V
CC_MAX
1
1
1
1
1
VRM output off
1
1
1
1
0
1.100
1
1
1
0
1
1.125
1
1
1
0
0
1.150
1
1
0
1
1
1.175
1
1
0
1
0
1.200
1
1
0
0
1
1.225
1
1
0
0
0
1.250
1
0
1
1
1
1.275
1
0
1
1
0
1.300
1
0
1
0
1
1.325
1
0
1
0
0
1.350
1
0
0
1
1
1.375
1
0
0
1
0
1.400
1
0
0
0
1
1.425
1
0
0
0
0
1.450
0
1
1
1
1
1.475
0
1
1
1
0
1.500
0
1
1
0
1
1.525
0
1
1
0
0
1.550
0
1
0
1
1
1.575
0
1
0
1
0
1.600
0
1
0
0
1
1.625
0
1
0
0
0
1.650
0
0
1
1
1
1.675
0
0
1
1
0
1.700
0
0
1
0
1
1.725
0
0
1
0
0
1.750
0
0
0
1
1
1.775
0
0
0
1
0
1.800
0
0
0
0
1
1.825
0
0
0
0
0
1.850