w83194br-pt Winbond Electronics Corp America, w83194br-pt Datasheet - Page 2

• Manufacturer Part Number: w83194br-pt
• Description: Stepless Via Pt Main Clock Generator
• Manufacturer: Winbond Electronics Corp America

Table of Contents-
1.
2.
3.
4.
5.
6.
7.
GENERAL DESCRIPTION ......................................................................................................... 1
PRODUCT FEATURES .............................................................................................................. 1
PIN CONFIGURATION ............................................................................................................... 2
BLOCK DIAGRAM ...................................................................................................................... 2
PIN DESCRIPTION..................................................................................................................... 3
5.1
5.2
5.3
5.4
5.5
5.6
5.7
FREQUENCY SELECTION BY HARDWARE OR SOFTWARE ................................................ 6
I
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
2
C CONTROL AND STATUS REGISTERS............................................................................... 7
Crystal I/O .............................................................................................................................3
CPU, AGP, and PCI, IOAPIC Clock Outputs ......................................................................3
I
Fixed Frequency Outputs.....................................................................................................4
Power Management Pins.....................................................................................................4
Power Pins............................................................................................................................5
MULTSEL [1:0] selects Function .........................................................................................5
Register 0: Frequency Select (Default = C4h) ....................................................................7
Register 1: CPU Clock Control (1 = Enable, 0 = Stopped) (Default = E3h) .......................7
Register 2: PCI Clock Control (1 = Enable, 0 = Stopped) (Default = FFh).........................8
Register 3: PCI, REF, 48MHz Clock Control (1 = Enable, 0 = Stopped) (Default = F8h) ..............8
Register 4:MULTISEL1 IOAPIC, AGP Control (1 = Enable, 0 = Stopped) (Default = 7Fh) ...........8
Register 5: Watchdog Control (Default = 80h) ....................................................................9
The Register 6, 7 is reserved for Buffer...............................................................................9
Register 8: Watchdog Timer (Default = 08h).......................................................................9
Register 9: M/N Program (Default = ADh)...........................................................................9
Register 10: M/N Program (Default = 67h)........................................................................10
Register 11: Spread Spectrum Programming (Default = 1Fh) .........................................10
Register 12: Divisor and Step-less Enable Control (Default = 08h) .................................10
Register 13: CPU to IOAPIC Skew Control (Default = A7h).............................................12
Register 14: CPU to PCI and IOAPIC Skew Control (Default = 90h)...............................12
Register 15: SEL24_48 and CPU to CPUCS skew Control (Default = 04h)....................12
Register 16: 24, 48, PCI Slew rate control (Default = FFh) ..............................................13
Register 17: PCI, AGP, REF Slew rate control (Default = FCh).......................................13
Register 18: IOAPIC, CPUCS Slew rate control (Default = FFh) .....................................13
Register 19: Winbond Chip ID (Read Only) (Default = 81h).............................................14
2
C Control Interface .............................................................................................................4
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W83194BR-PT