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Número de pieza | W83194BR-911 | |
Descripción | STEPLESS VIA PT/PM MAIN CLOCK GENERATOR | |
Fabricantes | Winbond | |
Logotipo | ||
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W83194BR-911
W83194BG-911
Winbond STEPLESS VIA PT/PM
MAIN CLOCK GENERATOR
Date: Mar/22/2006
Revision: 0.71
1 page W83194BR-911, W83194BG-911
STEPLESS CLOCK FOR VIA PT/PM CHIPSET
1. GENERAL DESCRIPTION
The W83194BR-911 is a Clock Synthesizer for VIA PT880/PM880 chipset. W83194BR-911 provides
all clocks required for high-speed microprocessor and provides step-less frequency programming and
32 different frequencies of CPU, PCI, and AGP clocks setting, support two 25MHz clock outputs, all
clocks are externally selectable with smooth transitions.
The W83194BR-911 provides I2C serial bus interface to program the registers to enable or disable
each clock outputs and provides -0.5% and +/-0.25% center type spread spectrum or programmable
S.S.T. scale to reduce EMI.
The W83194BR-911 also has watchdog timer and reset output pin to support auto-reset when
systems hanging caused by improper frequency setting.
The W83194BR-911 accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.
2. PRODUCT FEATURES
• 2 0.7V current-mode Differential pairs clock outputs
• 2 2.5V 25MHz clock outputs
• 3 AGP clock outputs
• 10 PCI synchronous clocks
• 1 24_48Mhz clock output for super I/O.
• 1 48 MHz clock output for USB.
• 3 14.318MHz REF clock outputs.
• AGP/PCI clock out supports synchronous and asynchronous mode
• Smooth frequency switch with selections from 100 to 400MHz
• Step-less frequency programming
• I2C 2-Wire serial interface and support byte read/write and block read/write.
• -0.5% and +/- 0.25% center type spread spectrum
• Programmable S.S.T. scale to reduce EMI
• Programmable registers to enable/stop each output and select modes
• Programmable clock outputs Slew rate control and Skew control
• Watch Dog Timer and RESET# output pins
• 48-pin SSOP package
Publication Release Date: March 2006
- 1 - Revision 0.71
5 Page W83194BR-911, W83194BG-911
STEPLESS CLOCK FOR VIA PT/PM CHIPSET
7. I2C CONTROL AND STATUS REGISTERS
7.1 Register 0: Frequency Select (Default = 10h)
BIT NAME
7 SSEL [4]
PWD
DESCRIPTION
0 Frequency selection by software via I2C
6 SSEL [3]
0
5 SSEL [2]
0
4 SSEL [1]
1
3 SSEL [0]
0
2 EN_SSEL
0 Enable software program FS [4:0].
0 = Select frequency by hardware.
1= Select frequency by software I2C - Bit 7~ 3.
1 EN_SPSP
0 Enable Spread Spectrum in the frequency table.
0 = Normal
1 = Spread Spectrum enabled
0 EN_SAFE_FREQ 0 Enable reload safe frequency when the watchdog is timeout.
0 = reload the FS [4:0] latched pins when watchdog time out.
1 = reload the safe frequency bit defined at Register 5 bit 4~0.
7.2 Register 1: CPU Clock (1 = Enable, 0 = Stopped) (Default: E2h)
BIT PIN NO PWD
DESCRIPTION
7 - 1 Reserved
6 43,42 1 CPUCLKT1 / C1 output control
5 40,39 1 CPUCLKT0 / C0 output control
4 - X Power on latched value of FS4 pin. Default: 0 (Read only)
3 - X Power on latched value of FS3 pin. Default: 0 (Read only)
2 - X Power on latched value of FS2 pin. Default: 0 (Read only)
1 - X Power on latched value of FS1 pin. Default: 1 (Read only)
0 - X Power on latched value of FS0 pin. Default: 0 (Read only)
7.3 Register 2: PCI Clock (1 = Enable, 0 = Stopped) (Default: FFh)
BIT PIN NO PWD
DESCRIPTION
7 10 1 PCI_F2 output control
6 9 1 PCI_F1 output control
5 8 1 PCI_F0 output control
4
Reserve
1 Reserved
Publication Release Date: March 2006
- 7 - Revision 0.71
11 Page |
Páginas | Total 25 Páginas | |
PDF Descargar | [ Datasheet W83194BR-911.PDF ] |
Número de pieza | Descripción | Fabricantes |
W83194BR-911 | STEPLESS VIA PT/PM MAIN CLOCK GENERATOR | Winbond |
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