Product specifications

CN333 Data Sheet
Revision 1.0, January 5, 2005 -23- Register Summary Tables
REGISTERS
Register Overview
The following tables summarize the configuration and I/O
registers of the CN333 North Bridge. These tables also
document the power-on default value (“Default”) and access
type (“Acc”) for each register. Access type definitions used
are RW (Read/Write), RO (Read/Only), “—” for reserved /
used (essentially the same as RO), RWC (or just WC) (Read /
Write 1’s to Clear individual bits) and W1 (Write Once then
Read / Only after that). Registers indicated as RW may have
some read/only bits that always read back a fixed value
(usually 0 if unused); registers designated as RWC or WC
may have some read-only or read write bits (see individual
register descriptions following these tables for details). All
offset and default values are shown in hexadecimal unless
otherwise indicated.
The graphics registers are described in a separate document.
Table 5. Registers
I/O Ports
Port #
I/O Port Default Acc
22 PCI / AGP Arbiter Disable 00 RW
CFB-8 Configuration Address 0000 0000 RW
CFF-C Configuration Data 0000 0000 RW