W83194BR-903_06 Datasheet, PDF (3/26 Pages) Winbond – STEPLESS VIA PT/PM MAIN CLOCK GENERATOR

W83194BR-903/W83194BG-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
7.19 Register 18: Slew rate Control (Default: 00h)..................................................................................14
7.20 Register 19: Slew rate Control (Default: D2h).................................................................................14
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