w83195bg-101 Winbond Electronics Corp America, w83195bg-101 Datasheet - Page 3

• Manufacturer Part Number: w83195bg-101
• Description: Winbond Clock Generator For Intel 915/925 Chipsets
• Manufacturer: Winbond Electronics Corp America

Tables of Content-
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GENERAL DESCRIPTION ......................................................................................................... 1
PRODUCT FEATURES .............................................................................................................. 1
PIN CONFIGURATION ............................................................................................................... 2
BLOCK DIAGRAM ...................................................................................................................... 3
PIN DESCRIPTION..................................................................................................................... 4
FREQUENCY SELECTION BY HARDWARE OR SOFTWARE ................................................ 7
I
5.1
5.2
5.3
5.4
5.5
5.6
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
7.10 Register 9: M/N Program Register (Default: 7Ah) ..................................................................11
7.11 Register 10: Reserved (Default: 3Bh) .....................................................................................12
7.12 Register 11: Spread Spectrum Programming (Default: 0Bh).................................................12
7.13 Register 12: Divisor Control (Default: 72h) .............................................................................12
7.14 Register 13: Step-less Enable Control (Default: 0Fh) ............................................................13
7.15 Register 14: Control (Default: 10h)..........................................................................................14
7.16 Register 15: Reserved (Default: ECh).....................................................................................14
7.17 Register 16: Skew Control (Default: E4h) ...............................................................................14
7.18 Register 17: Reserved (Default: 00h)......................................................................................14
7.19 Register 18: Reserved (Default: 00h)......................................................................................14
7.20 Register 19: Reserved (Default: DAh).....................................................................................15
2
C CONTROL AND STATUS REGISTERS............................................................................... 8
Crystal I/O...................................................................................................................................4
CPU, SRC, PCIF, and PCI Clock Outputs................................................................................4
Frequency select, and Fixed Frequency Outputs.....................................................................5
I2C Control Interface..................................................................................................................5
Power Management Pins ..........................................................................................................6
Power Pins .................................................................................................................................6
Register 0: Frequency Select Register (Default = 10h)............................................................8
Register 1: CPU Clock Control (1 = Enable, 0 = Stopped) (Default: E7h)...............................8
Register 2: PCI Clock Control (1 = Enable, 0 = Stopped) (Default: FFh) ................................9
Register 3: PCI Clock Control (1 = Enable, 0 = Stopped) (Default: FFh) ................................9
Register 4: 48MHz, DOT, REF Control (1 = Enable, 0 = Stopped) (Default: FFh)..................9
Register 5: Watchdog Control (Default: 02h) ..........................................................................10
Register 6: SRC Control (1 = Enable, 0 = Stopped) (Default: FEh).......................................10
Register 7: Winbond Chip ID (Default: 22h) (Read Only).......................................................10
Register 8: M/N Program (Default: D0h).................................................................................11
STEPLESS FOR INTEL 915/925 CHIPSETS
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W83195BR/G-101