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W83193R-04A Datasheet(PDF) 7 Page - Winbond |
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W83193R-04A Datasheet(HTML) 7 Page - Winbond |
7 / 18 page Preliminary W83193R-02/-04/-04A Publication Release Date: April 1999 - 7 - Revision A1 8.3.1 Register 0: CPU Frequency Select Register (1 = Enable, 0 = Stopped) BIT @POWERUP PIN DESCRIPTION 7 0 - 0 = ±1.5% Spread Spectrum Modulation 1 = ±0.5% Spread Spectrum Modulation 6 0 - SSEL2 (Frequency table selection by software via I 2C) 5 0 - SSEL1 (Frequency table selection by software via I 2C) 4 0 - SSEL0 (Frequency table selection by software via I 2C) 3 0 - 0 = Selection by hardware 1 = Selection by software I 2C - Bit 6:4 2 0 - 0 = Spread Spectrum center spread type 1 = Spread Spectrum down spread type 1 0 - 0 = Normal 1 = Spread Spectrum enabled 0 0 - 0 = Running 1 = Tristate all outputs Frequency table selection by software via I 2C SSEL2 SSEL1 SSEL0 CPU, SDRAM (MHz) PCI (MHz) REF, IOAPIC (MHz) 0 0 0 50 25 14.318 0 0 1 75 32 14.318 0 1 0 83.3 41.65 14.318 0 1 1 68.5 34.25 14.318 1 0 0 83.3 33.3 14.318 1 0 1 75 37.5 14.318 1 1 0 60 30 14.318 1 1 1 66.8 33.4 14.318 FUNCTION TABLE FUNCTION OUTPUTS DESCRIPTION CPU PCI SDRAM REF IOAPIC TRI-STATE Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z NORMAL See table See table CPU 14.318 14.318 |
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