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32579B
9.1.7
Pull-Up and Pull-Down Resistors
The following table lists input balls that are internally con-
nected to a pull-up (PU) or pull-down (PD) resistor. If these
balls are not used, they do not require connection to an
external PU or PD resistor.
Signal Name
Ball No.
PCI
FRAME#
D8
C/BE[3:0]#
H4, F3, J2,
L1
PAR
J4
IRDY#
F2
TRDY#
F1
STOP#
G1
LOCK#
H3
DEVSEL#
E4
PERR#
H2
SERR#
H1
REQ[1:0]#
A5, B5
INTA#
D26
INTB#
C26
INTC#
C9
INTD#
AA2
Low Pin Count (LPC)
LAD[3:0]
L29, L30,
L31, M28
LDRQ
L28
SERIRQ
J31
System (Straps)
CLKSEL[3:0]
P30, D29,
AF3, B8
BOOT16
C8
TFT_PRSNT
P29
LPC_ROM
D6
FPCI_MON
A4
DID[1:0]
C6, C5
ACCESS.bus (Note 2)
AB1C
N31
AB1D
N30
AB2C
N29
AB2D
M29
Parallel Port
AFD#/DSTRB#
D22
PE
D17
SLIN#/ASTRB#
B20
STB#/WRITE#
A22
INIT#
B21
JTAG
370
Table 9-9. Balls with PU/PD Resistors
Typ Value [Ω]
PU/PD
(Note 1)
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PD
100K
PD
100K
PD
100K
PD
100K
PD
100K
PD
100K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PUNote 2
22.5K
PDNote 2
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
Note: The resistors described in this table are imple-
mented as transistors. The resistance for PUs
assumes V
= V
IN
SS
V
.
IO
Signal Name
Ball No.
TCK
E31
TMS
F28
TDI
F29
TRST#
E29
GPIO (Note 2)
GPIO1
D10, N30
GPIO6
D28
GPIO7
C30
GPIO8
C31
GPIO9
C28
GPIO10
B29
GPIO11
AJ8
GPIO12
N29
GPIO13
M29
GPIO14
D9
GPIO15
A8
GPIO16
V31
GPIO17
A10
GPIO18
AG1
GPIO19
C9
GPIO20
A9, N31
GPIO32
M28
GPIO33
L31
GPIO34
L30
GPIO35
L29
GPIO36
L28
GPIO37
K31
GPIO38
K28
GPIO39
J31
Power Management
PWRBTN#
AH5
GPWIO[2:0]
AJ6, AK5,
AH6
Test and Measurement
GTEST
F30
Note 1.
Accuracy is: 22.5 KΩ resistors are within a range of 20
KΩ to 50 KΩ. 100 KΩ resistors are within a range of 90
KΩ to 250 KΩ.
Note 2.
Controlled by software.
AMD Geode™ SC1200/SC1201 Processor Data Book
Electrical Specifications
and for PDs assumes V
IN
Typ Value [Ω]
PU/PD
(Note 1)
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
22.5K
PU
100K
PU
100K
PD
22.5K
=
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