w83195bg-120 Winbond Electronics Corp America, w83195bg-120 Datasheet - Page 3

• Manufacturer Part Number: w83195bg-120
• Description: Winbond Clock Generator W83195br-120/w83195bg-120 For Intel 915/945 Chipset
• Manufacturer: Winbond Electronics Corp America

Table of Content-
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GENERAL DESCRIPTION ......................................................................................................... 1
PRODUCT FEATURES .............................................................................................................. 1
PIN CONFIGURATION ............................................................................................................... 2
BLOCK DIAGRAM ...................................................................................................................... 3
PIN DESCRIPTION..................................................................................................................... 4
5.1
5.2
5.3
5.4
5.5
5.6
FREQUENCY SELECTION BY HARDWARE OR SOFTWARE ................................................ 7
I2C CONTROL AND STATUS REGISTERS .............................................................................. 8
7.1
7.2
7.3
7.4
7.5
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
7.19
7.20
7.21
7.22
Crystal I/O.................................................................................................................................4
CPU, SRC, and PCI_E, PCI, Clock Outputs...........................................................................4
Fixed Frequency Outputs.........................................................................................................5
I2C Control Interface ................................................................................................................5
Power Management Pins.........................................................................................................5
Power Pins................................................................................................................................6
Regisbit 0: Frequency Select (Default: 10h)............................................................................8
Register 1: CPU Clock Control (1 = Enable, 0 = Disable) (Default: E2h)...............................8
Register 2: PCI Clock Control (1 = Enable, 0 = Disable) (Default: FFh) ................................9
Register 3: PCI Clock Control (1 = Enable, 0 = Disable) (Default: FFh) ................................9
Register 4: 24_48MHz, 48MHz, REF Control (1 = Enable, 0 = Disable) (Default: FFh) .......9
Register 5: Watchdog Control (Default: 02h) ........................................................................10
Register 6: PCIE Control (1 = Enable, 0 = Disable) (Default: FEh)......................................10
Register 7: Winbond Chip ID (Default: 22h) (Read Only).....................................................11
Register 8: M/N Program (Default: 90h)................................................................................11
Register 9: M/N Program Register (Default: BBh) ................................................................11
Register 10: Reserved (Default: 3Bh)....................................................................................12
Register 11: Spread Spectrum Programming (Default: 0Eh) ...............................................12
Register 12: Divisor Control (Default: 08h)............................................................................12
Register 13: Step-less Enable Control (Default: 0Ah)...........................................................13
Register 14: Control (Default: 10h) ........................................................................................13
Register 15: SST Control (Default: ECh)...............................................................................14
Register 16: Skew Control (Default: E4h) .............................................................................14
Note: The skew rate control select bit fit value Please felloe below table............................14
Register 17: Slew rate Control (Default: 00h)........................................................................15
Register 18: Reserved (Default: 00h) ....................................................................................15
Register 19: Skew Control (Default: DAh).............................................................................15
Register 20: Watch dog timer (Default: 88h).........................................................................16
W83195BR-120/W83195BG-120
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