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Revision 1.1
G
General Configuration Block
(Continued)
3.2
The registers described in the Table 3-2 are used to deter-
mine general configuration for the Geode SC1100. These
registers also indicate which multiplexed signals are issued
via balls from which more than one signal may be output.
MULTIPLEXING, INTERRUPT SELECTION, AND BASE ADDRESS REGISTERS
For more information about multiplexed signals and the
appropriate configurations, see Section 2.1 "Ball Assign-
ments" on page 17.
Table 3-2. Multiplexing, Interrupt Selection, and Base Address Registers
Bit
Description
Offset 30h
Width: DWORD
This register configures pins with multiple functions. See Section 2.1 "Ball Assignments" on page 17 for more information about multi-
plexing information.
Pin Multiplexing Register - PMR (R/W)
Reset Value: 00000000h
31:30
29
Reserved.
Always write 0.
Test Signals.
Selects ball functions.
0: Internal Test/Serial Port Signal
Ball #
Name
AA24
GPIO41
F_C/BE0#
AD10
FMUL3B
AC11
PLL5B
C20
IRTX+GXCLK
Test Signals.
Selects ball function.
0: GPIO Signal
Ball #
Name
B20
GPIO40
F_AD6
FPCI_MON (Fast-PCI Monitoring).
Fast-PCI monitoring output signals can be enabled in two ways: by setting this bit to 1
or by strapping FPCI_MON (ball AB25) high. (The strapped value can be read back at MCR[30].) Listed below is how these
two options work together and the signals that are enabled (enabling overrides add’l dependencies).
PMR[27] FPCI_MON
0
0
Disable Fast-PCI monitoring signals
0
1
Enable Fast-PCI monitoring signals
1
0
Enable Fast-PCI monitoring signals
1
1
Enable Fast-PCI monitoring signals
Ball #
FPCI_MON Signal
Other Signal
AD24
FPCICLK
GPIO1
AB24
F_AD7
GPIO47
B20
F_AD6
GPIO40+SDTEST5
AB23
F_AD5
GPIO38
AD23
F_AD4
GPIO13+AB2D
AE23
F_AD3
GPIO12+AB2C
Y2
F_AD2
AB1D
Y1
F_AD1
AB1C
AC24
F_AD0
GPIO18
AF11
F_C/BE3#
GPIO7+RTS#+IDE_DACK1#
AE11
F_C/BE2#
SOUT
AD11
F_C/BE1#
SIN
AA24
F_C/BE0#
GPIO41+TEST0
AF12
F_FRAME#
GPIO10+DSR#+IDE_IORDY1
AE12
F_IRDY#
GPIO9+DCD#+IDE_IOW1#
AE18
F_DEVSEL#
GPIO16+IRRX1+PC_BEEP
AF23
F_STOP#
AC97_RST#
AF22
F_GNT0#
SDATA_IN
AC22
F_TRDY#
BIT_CLK
AE18
F_DEVSEL#
GPIO16+PC_BEEP+IRRX1
AD12
INTR_O
GPIO6+DTR#/BOUTIDE_IOR1#
AC12
SMI_O
GPIO8+CTS#+IDE_DREQ1
Reserved:
Always write 0.
1: Internal Test Signal
Name
TEST0
F_C/BE0#
TEST1
TEST2
TEST3
Add’l Dependencies
PMR[27] and FPCI_MON = 0
PMR[27] or FPCI_MON = 1
None
None
See PMR[6]
Add’l Dependencies
PMR[27] and FPCI_MON = 0
PMR[27] or FPCI_MON = 1
None
None
PMR[6] = 1
28
1: Internal Test Signal
Name
SDTEST5
F_AD6
Add’l Dependencies
PMR[27] and FPCI_MON = 0
PMR[27] or FPCI_MON = 1
Add’l Dependencies
PMR[27] and FPCI_MON = 0
PMR[27] or FPCI_MON = 1
27
Add’l Dependencies
None
None
See PMR[28]
None
See PMR[19]
See PMR[19]
None
None
None
See PMR[17]
None
None
See PMR[29]
See PMR[18]
See PMR[18]
See PMR[6]
None
None
None
See PMR[6]
See PMR[18]
See PMR[17]
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