W83194BR-903
Table of Contents-
1.
2.
3.
4.
5.
GENERAL DESCRIPTION ......................................................................................................... 1
PRODUCT FEATURES .............................................................................................................. 1
PIN CONFIGURATION............................................................................................................... 2
BLOCK DIAGRAM ...................................................................................................................... 2
PIN DESCRIPTION..................................................................................................................... 3
5.1
5.2
5.3
5.4
5.5
5.6
5.7
Crystal I/O.................................................................................................................................3
CPU, AGP, and PCI Clock Outputs.........................................................................................3
Fixed Frequency Outputs.........................................................................................................4
I2C Control Interface ................................................................................................................4
Power Management Pins.........................................................................................................5
IREF selects Function..............................................................................................................5
Power Pins................................................................................................................................5
6.
7.
FREQUENCY SELECTION BY HARDWARE OR SOFTWARE ................................................ 6
I2C CONTROL AND STATUS REGISTERS............................................................................... 7
7.1
7.2
7.3
7.4
Register 0: Frequency Select (Default = 10h).........................................................................7
Register 1: CPU Clock (1 = Enable, 0 = Stopped) (Default: E2h)..........................................7
Register 2: PCI Clock (1 = Enable, 0 = Stopped) (Default: FFh)............................................8
Register 3: PCI, AGP Clock (1 = Enable, 0 = Stopped) (Default: FFh)..................................8
7.5
Register 4: 24_48MHz, 48MHz, REF, 25MHz Control (1 = Enable, 0 = Stopped) (Default:
8
BFh)
7.6
7.7
7.8
7.9
7.10
7.11
7.12
7.13
7.14
7.15
7.16
7.17
7.18
Register 5: Watchdog Control (Default: 02h) ..........................................................................9
Register 6: Reserved (Default: 50h) (Read Only)...................................................................9
Register 7: Winbond Chip ID (Default: 70h) (Read Only).....................................................10
Register 8: M/N Program (Default: 90h)................................................................................10
Register 9: M/N Program (Default: 7Ah) ...............................................................................10
Register 10: M/N Program (Default: BBh).............................................................................11
Register 11: Spread Spectrum Programming (Default: 0Bh) ...............................................11
Register 12: Divisor and Step-less Enable Control (Default: FBh).......................................11
Register 13: Divisor and Step-less Enable Control (Default: 0Fh) .......................................12
Register 14: Control (Default: 0Ah)........................................................................................12
Register 15: SST & Skew Control (Default: 2Ch) .................................................................13
Register 16: Skew Control (Default: 24h)..............................................................................13
Register 17: Slew rate Control (Default: 00h)........................................................................13
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