4.0General Configuration Block; Configuration Block Addresses; Table 4-1. General Configuration Block Register Summary - AMD Geode SC1200 Data Book

General Configuration Block
The General Configuration block includes registers for:
• Pin Multiplexing and Miscellaneous Configuration
• WATCHDOG Timer
• High-Resolution Timer
• Clock Generators
A selectable interrupt is shared by all these functions.
4.1

Configuration Block Addresses

Registers of the General Configuration block are I/O
mapped in a 64-byte address range. These registers are
physically connected to the internal Fast-PCI bus, but do

Table 4-1. General Configuration Block Register Summary

Width
Offset (Bits)
00h-01h 16
02h-03h 16
04h 8
05h-07h ---
08h-0Bh 32
0Ch 8
0Dh 8
0Eh-0Fh ---
10h 8
11h ---
12h 8
13h-17h ---
18h-1Bh 32
1Ch-1Dh ---
1Eh-1Fh 16
20h-2Fh ---
30h-33h 32
34h-37h 32
38h 8
39h-3Bh ---
3Ch 8
3Dh 8
3Eh-3Fh 16
AMD Geode™ SC1200/SC1201 Processor Data Book

4.0General Configuration Block

Type Name
R/W WDTO. WATCHDOG Timeout
R/W WDCNFG. WATCHDOG Configuration
R/WC WDSTS. WATCHDOG Status
--- RSVD. Reserved
RO TMVALUE. TIMER Value
R/W TMSTS. TIMER Status
R/W TMCNFG. TIMER Configuration
--- RSVD. Reserved
RO MCCM. Maximum Core Clock Multiplier
--- RSVD. Reserved
R/W PPCR. PLL Power Control
--- RSVD. Reserved
R/W PLL3C. PLL3 Configuration
--- RSVD. Reserved
R/W CCFC. Core Clock Frequency Control
--- RSVD. Reserved
R/W PMR. Pin Multiplexing Register
R/W MCR. Miscellaneous Configuration Register
R/W INTSEL. Interrupt Selection
--- RSVD. Reserved
RO ID. Device ID
RO REV. Revision
RO CBA. Configuration Base Address
not have a register block in PCI configuration space (i.e.,
they do not appear to software as PCI registers).
After system reset, the Base Address register is located at
I/O address 02EAh. This address can be used only once.
Before accessing any PCI registers, the BOOT code must
program this 16-bit register to the I/O base address for the
General Configuration block registers. All subsequent
writes to this address, are ignored until system reset.
Note: Location of the General Configuration Block cannot
be determined by software. See the AMD Geode™
SC1200/SC1201 Processor Specification Update
document.
Reserved bits in the General Configuration block should be
read as written unless otherwise specified.
Strapped Value
Strapped Value
32579B
4
Reset Value Reference
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