W83194BR-903 Datasheet, PDF (2/26 Pages) Winbond – STEPLESS VIA PT/PM MAIN CLOCK GENERATOR

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