SC1100 Datasheet, PDF (51/348 Pages) National Semiconductor (TI) – Geode™ Information Appliance On a Chip

General Configuration Block (Continued)
Table 3-2. Multiplexing, Interrupt Selection, and Base Address Registers (Continued)
Bit Description
25
24:22
21
20
19
18
17
16
15
AC97CKEN (Enable AC97_CLK Output). This bit enables the output drive of AC97_CLK (ball AC21).
0: AC97_CLK output is HiZ.
1: AC97_CLK output is enabled.
Reserved: Always write 0.
GPSEL1 (Select Functions/Commands). Selects ball functions.
0: GPIO/IO Command Signal
Ball # Name
Add’l Dependencies
1: DOC/NAND Signal
Name
Add’l Dependencies
D22
GPIO14
IOCS1#
PMR[2] = 0
PMR[2] = 1
IOR#
DOCR#
PMR[2] = 0
PMR[2] = 1
C22
IOW#
GPIO15
PMR[2] = 0
PMR[2] = 1
IOW#
DOCR#
PMR[2] = 0
PMR[2] = 1
Reserved. Must be set to 0.
AB2SEL (Select ACCESS.bus 2). Selects ball functions.
0: GPIO Signal
Ball # Name
Add’l Dependencies
1: ACCESS.bus 2 Signal
Name
Add’l Dependencies
AE23
GPIO12
F_AD3
PMR[27] and FPCI_MON = 0
PMR[27] or FPCI_MON = 1
AB2C
F_AD3
PMR[27] and FPCI_MON = 0
PMR[27] or FPCI_MON = 1
AD23
GPIO13
F_AD4
PMR[27] and FPCI_MON = 0
PMR[27] or FPCI_MON = 1
AB2D
F_AD4
PMR[27] and FPCI_MON = 0
PMR[27] or FPCI_MON = 1
SPSEL (Select SP Functions). Selects ball functions.
0: GPIO/IDE Signal
Ball # Name
Add’l Dependencies
1: Serial Port Signal
Name Add’l Dependencies
AD12
GPIO6
IDE_IOR1#
INTR_O
PMR[8] = 0 and Note
PMR[8] = 1 and Note
PMR[27] or FPCI_MON = 1
DTR#/BOUT
Undefined
INTR_O
PMR[8] = 0 and Note
PMR[8] = 1 and Note
PMR[27] or FPCI_MON = 1
AE12
GPIO9
IDE_IOW1#
F_IRDY#
PMR[8] = 0 and Note
PMR[8] = 1 and Note
PMR[27] or FPCI_MON = 1
DCD#
Undefined
F_IRDY#
PMR[8] = 0 and Note
PMR[8] = 1 and Note
PMR[27] or FPCI_MON = 1
AF12
GPIO10
IDE_IORDY1
F_FRAME#
PMR[8] = 0 and Note
PMR[8] = 1 and Note
PMR[27] or FPCI_MON = 1
DSR#
Undefined
F_FRAME#
PMR[8] = 0 and Note
PMR[8] = 1 and Note
PMR[27] or FPCI_MON = 1
AF19
GPIO11
IRQ15
PMR[8] = 0
PMR[8] = 1
RI#
Undefined
PMR[8] = 0
PMR[8] = 1
Note: PMR[27] and FPCI_MON = 0.
SPCRSEL (Select SP2 Flow Control). Selects ball functions.
0: GPIO/IDE Signal
Ball # Name
Add’l Dependencies
1: Serial Port Signal
Name
Add’l Dependencies
AF11
GPIO7
IDE_DACK1#
F_C/BE3#
PMR[8] = 0 and Note
PMR[8] = 1 and Note
PMR[27] or FPCI_MON = 1
RTS
Undefined
F_C/BE3#
PMR[8] = 0 and Note
PMR[8] = 1 and Note
PMR[27] or FPCI_MON = 1
AC12
GPIO8
IDE_DREQ1
SMI_O
PMR[8] = 0 and Note
PMR[8] = 1 and Note
PMR[27] or FPCI_MON = 1
CTS#
Undefined
F_C/BE3#
PMR[8] = 0 and Note
PMR[8] = 1 and Note
PMR[27] or FPCI_MON = 1
Note: PMR[27] and FPCI_MON = 0.
SERISEL (Select SERIRQ Function). Selects ball function.
0: GPIO Signal
Ball # Name
Add’l Dependencies
1: Serial IRQ Signal
Name
Add’l Dependencies
A24
GPIO39
None
SERIRQ
None
Reserved: Always write 0.
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