w83194br-b Winbond Electronics Corp America, w83194br-b Datasheet - Page 3

• Manufacturer Part Number: w83194br-b
• Description: Winbond Clock Generator For Intel P4 845 Series Chipset
• Manufacturer: Winbond Electronics Corp America

Table of Contents-
1.
2.
3.
4.
5.
6.
7.
8.
GENERAL DESCRIPTION............................................................................................................. 1
PRODUCT FEATURES ................................................................................................................. 1
PIN CONFIGURATION .................................................................................................................. 2
BLOCK DIAGRAM ......................................................................................................................... 3
PIN DESCRIPTION........................................................................................................................ 4
5.1 Crystal I/O..........................................................................................................................................4
5.2 CPU, 3V66, PCI Clock Outputs ........................................................................................................5
5.3 I2C Control Interface .........................................................................................................................6
5.4 Fixed Frequency Outputs..................................................................................................................6
5.5 Power Pins ........................................................................................................................................7
FREQUENCY SELECTION BY HARDWARE OR SOFTWARE ................................................... 8
I
7.1 Register 0: Frequency Select Register (Default = 0) .......................................................................9
7.2 Register 1: CPU Clock Register (1 = Enable, 0 = Stopped)............................................................9
7.3 Register 2: PCI Clock Register (1 = Enable, 0 = Stopped)............................................................10
7.4 Register 3: PCI, 48MHz Clock Register (1 = Enable, 0 = Stopped)..............................................10
7.5 Register 4: 3V66 Control Register (1 = Enable, 0 = Stopped) ......................................................10
7.6 Register 5: Watchdog Control Register..........................................................................................11
7.7 Register 6: Watchdog Timer Register ............................................................................................11
7.8 Register 7: M/N Program Register .................................................................................................12
7.9 Register 8: M/N Program Register .................................................................................................12
7.10 Register 9: Spread Spectrum Programming Register ...................................................................12
7.11 Register 10: Divisor and Step-less Enable and Skew Control Register........................................13
7.12 Register 11: C Winbond Chip ID Register (Read Only).................................................................13
7.13 Register 12: Winbond Chip ID Register (Read Only) ....................................................................14
7.14 Register 13: SEL24_48 and FIX_3V66_PCI Control.....................................................................14
7.15 Register 14: Control the period of spread spectrum ......................................................................15
7.16 Register 15: Slew Rate Control ......................................................................................................15
7.17 Register 16: Slew Rate Control ......................................................................................................16
7.18 Register 17: Slew Rate Control ......................................................................................................16
7.19 Register 81: Winbond Test Register I.............................................................................................16
7.20 Register 82: Winbond Test Register II............................................................................................16
ACCESS INTERFACE ................................................................................................................. 17
8.1 Block Write protocol ........................................................................................................................17
2
C CONTROL AND STATUS REGISTERS .................................................................................. 9
CLOCK GEN. FOR INTEL P4 845 SERIES CHIPSET
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W83194BR-B/W83194BG-B