Service manual
Schematic Diagrams
B - 4
Schematic Diags
CPU Northwood & Prescott (2 of 2)
Sheet 3 of 42
CPU Northwood &
Prescott
(2 of 2)
VCORE
VCORE
VCORE
VCC3S
VCORE
VDD3
VCORE
VCCVID
VDD3
TMS
TCK
TDI
TRST#
HCPURST#
HIT#
DBR#
THERMTRIP#_ICH
TDO
TCK
BNR#
HLOCK#
FSA
CPUPWRGD
THERMDA
HTRDY#
FERR#VCCCA
RSP#
DEFER#
HDBI0#
INTR
THERMDC
INIT#
FSB
VCCIOPLL
A20M#
IGNNE#
PROCHOT#
HSTPCLK#
IERR#
HCPURST#
TDI
HDRDY#
HGTLREF
HDBI3#
BPRI#
COMP_1
TMS
HDBI2# BR0#
SMI#
TRST#
HDBI1#
HITM#
DBSY#
BINIT#VSSA
ADS#
MCERR#
NMI
TCK
HCPURST#
TDI
TMS
TRST#
TCK
TPWR
DBR#
TP_DBA_ITP
TDO
TPWR
TDO
VCCVID
VID_PWRGD
IERR#
CPUPWRGD
PROCHOT#
BR0#
FERR#
CPUSLP#
THERMTRIP#
COMP_0
TP_DBA_ITP
THERMDC
TMP_SMDATA
TMP_SMCLK
THERMDA
D18 F01J2E(R)
A C
R519 0
12
R138 47
R555
169_1%
12
C716
1U_0805_X7R
12
C727
220P
12
C736
220P
12
C735
1U_0805_X7R
12
C715
220P
12
C724
220P
12
R556 200_1%1 2
+
CP2 10U(0805)1 2
R557 61.9_1%12
L65 4.7UH(0805)1 2
R586 6212
R209 68012
R208 27.4_1%12
R559 61.9_1%12
R201 15012
R221 39.2_1%12
T155
T158
T171
T154
T170
R141
10K
L66
4.7UH(0805)
1 2
T270
+
CP3 10U(0805)1 2
T272
T271
T327
T328
U35
ADM1032ARM
8
7
6
54
3
2
1
SCLK
SDATA
ALERT#
GNDTHERM#
D-
D+
VDD
R147 20K
R146 0(R)
C648 2200P
C638
0.1U
T54
T53
CN2
ITP CONN
1
3
5
7
9
11
13
15
17
19
21
23
25
2
4
6
8
10
12
14
16
18
20
22
24
26
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
R139 5112
R140 1.5K_1%
T326
C326
0.1U
R593 6212
R490 10K(R)
D14
F01J2E(R)
AC
R222 20012
R162 12012
R595 300_1%12
U38B
NORTHWOOD478
AC1
V5
A5
AC26
AD26
AE25
L5
R5
P1
E5
D1
F6
F20
AA6
AA21
W23
P23
J23
F21
W22
R22
K22
E22
AF23
AF22
AC3
V6
B6
Y4
AA3
W5
AB2
H5
H2
J6
G1
G4
H6
G2
F3
E3
D2
E2
D4
C1
F7
E6
D5
B3
C4
A2
C3
B2
B5
C6
AB26
AB23
AB25
A4
V21
P26
G25
E21
C25
C5
C7
C9
D10
D12
D14
D16
D18
D20
D21
D24
D3
D6
D8
AE23
AD20
AD22
K24
K3
K6
L1
L23
L26
L4
M2
M22
M25
M5
N21
N24
N3
N6
P2
P22
P25
P5
E13
E15
E17
E19
E23
E26
E4
E7
E9
F10
F12
F14
F16
F18
F2
F22
F25
F5
J2
J22
J25
J5
K21
R1
R23
T6
U2
U22
U25
U5
V1
V23
V26
V4
W21
W24
W3
W6
Y2
Y22
Y25
Y5
G6
R26
E11
E1
F8
G21
G24
T3
T24
T21
G3
R4
AD6
AD5
L24
AF4
C22
A22
A7
AD2
AE21
AF3
AF24
AF25
B1
AP0
AP1
VCC_SENSE
ITP_CLK0
ITP_CLK1
DBRESET
ADSTB0
ADSTB1
COMP1
LINT1
LINT0
GTLREF3
GTLREF2
GTLREF1
GTLREF0
STBP3
STBP2
STBP1
STBP0
STBN3
STBN2
STBN1
STBN0
BCLK1
BCLK0
IERR
MCERR
FERR
STPCLK
BINIT
INIT
RSP
DBSY
DRDY
TRDY
ADS
LOCK
BR0
BNR
HIT
HITM
BPRI
DEFER
TCK
TDI
TMS
TRST
TDO
THERMDA
THERMDC
THERMTRIP
PROCHOT
IGNNE
SMI
A20M
SLP
PWRGOOD
RESET
VSS_SENSE
DB#3
DB#2
DB#1
DB#0
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VCCIOPLL
VCCA
VSSA
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
BSEL0
BSEL1
COMP0
VCCVID
VSS
RESERVED0
RESERVED1
VIDPWRGD
RESERVED4
RESERVED5/VCCVIDPRG
RESERVED6
RESERVED7
NC
R507 62_1%12
R729
200
R824 0
VCORE [2,4,5,19,20,38]
VCC3 [5,6,19,22,23,27,29,32,33,35,36,37,38,39,40,41,42]
SMI# [19]
HIT# [6]
IGNNE# [19]
BR0# [6]
DBSY# [6]
HLOCK# [6]
FERR# [19]
FSA [5]
HDRDY# [6]
DEFER# [6]
HITM# [6]
INIT# [19]
A20M# [19]
FSB [5]
BPRI# [6]
HSTPCLK# [19]
HCPURST# [6]
ADS# [6]
HTRDY# [6]
CPUPWRGD [19]
HDBI1#[6]
ITPCLK#[5]
BNR# [6]
NMI[19]
HDSTBP0#[6]
HDSTBP2#[6]
HADSTB0#[6]
HDSTBP1#[6]
HADSTB1#[6]
HDSTBN0#[6]
HDBI3#[6]
HDSTBN3#[6]
HDBI0#[6]
ITPCLK[5]
HDSTBN1#[6]
HDBI2#[6]
HDSTBP3#[6]
HDSTBN2#[6]
CPUCLK#[5]
CPUCLK[5]
BPM0# [2]
BPM1# [2]
TPRDY# [2]
TPREQ# [2]
ITPCLK [5]
ITPCLK# [5]
PROCHOT# [6]
THERMTRIP#_ICH [19]
VID_PWRGD [42]
DD_ON [19,25,26,31,39]
VSS_SENSE[38]
VCC_SENSE[38]
PWROK [6,19,27]
CPUSLP# [19]
DBR#[19]
INTR[19]
HGTLREF[6]
TMP_SMDATA [31]
TMP_SMCLK [31]
ATF_INT# [19,32]
GTLREF GENERATION CIRCUITS
12mil trace
VCCA route parallel and VSSA route
L should be close to c
Layout Note:
RES Place close to ITP
CPU SIGNAL TERMINATION
CLOSE TO CPU
CLOSE TO CPU PIN
10 MILE
10 MILE