ICS950901 Datasheet, PDF (4/20 Pages) Integrated Circuit Systems – Programmable Timing Control Hub for P4

Integrated
Circuit
Systems, Inc.
ICS950901
Byte 0: Functionality and frequency select register (Default=0)
Bit
Bit
(2,7:4)
Bit 3
Bit 1
Bit 0
Description
Bit2
Bit7
FS3
Bit6
FS2
Bit5
FS1
Bit4 _{CPUCLK AGPCLK PCICLK}
FS0 ^MHz
MHz
MHz
Spread %
0 0 0 0 0 66.67 66.66 33.33 +/- 0.30% Center Spread
0 0 0 0 1 100.00 66.67 33.33 +/- 0.30% Center Spread
0 0 0 1 0 133.33 66.67 33.33 +/- 0.30% Center Spread
0 0 0 1 1 200.00 66.66 33.33 +/- 0.30% Center Spread
0 0 1 0 0 100.90 67.27 33.63 +/- 0.30% Center Spread
0 0 1 0 1 103.00 68.67 34.33 +/- 0.30% Center Spread
0 0 1 1 0 107.00 71.33 35.67 +/- 0.30% Center Spread
0 0 1 1 1 110.00 73.33 36.67 +/- 0.30% Center Spread
0 1 0 0 0 133.90 66.95 33.48 +/- 0.30% Center Spread
0 1 0 0 1 137.33 68.66 34.33 +/- 0.30% Center Spread
0 1 0 1 0 140.00 70.00 35.00 +/- 0.30% Center Spread
0 1 0 1 1 142.66 71.33 35.67 +/- 0.30% Center Spread
0 1 1 0 0 145.33 72.66 36.33 +/- 0.30% Center Spread
0 1 1 0 1 146.66 73.33 36.67 +/- 0.30% Center Spread
0 1 1 1 0 153.33 76.66 38.33 +/- 0.30% Center Spread
0 1 1 1 1 160.00 80.00 40.00 +/- 0.30% Center Spread
1 0 0 0 0 66.67 66.66 33.33 0 to - 0.6% Down Spread
1 0 0 0 1 100.00 66.67 33.33 0 to - 0.6% Down Spread
1 0 0 1 0 133.33 66.67 33.33 0 to - 0.6% Down Spread
1 0 0 1 1 200.00 66.66 33.33 0 to - 0.6% Down Spread
1 0 1 0 0 66.67 66.66 33.33 +/- 0.50% Center Spread
1 0 1 0 1 100.00 66.67 33.33 +/- 0.50% Center Spread
1 0 1 1 0 133.33 66.67 33.33 +/- 0.50% Center Spread
1 0 1 1 1 200.00 66.66 33.33 +/- 0.30% Center Spread
1 1 0 0 0 201.00 67.00 33.50 +/- 0.30% Center Spread
1 1 0 0 1 203.00 67.67 33.83 +/- 0.30% Center Spread
1 1 0 1 0 205.00 68.33 34.17 +/- 0.30% Center Spread
1 1 0 1 1 207.00 69.00 34.50 +/- 0.30% Center Spread
1 1 1 0 0 209.00 69.67 34.83 +/- 0.30% Center Spread
1 1 1 0 1 211.00 70.33 35.17 +/- 0.30% Center Spread
1 1 1 1 0 213.00 71.00 35.50 +/- 0.30% Center Spread
1 1 1 1 1 215.00 71.67 35.83 +/- 0.30% Center Spread
0 - Frequency is selected by hardware select, latched inputs
1 - Frequency is selected by Bit 2,7:4
0 - Normal
1 - Spread spectrum enable
0 - Watch dog safe frequency will be selected by latch inputs
1 - Watch dog safe frequency will be programmed by Byte 10 bit (4:0)
PWD
Note 1
0
1
0
Notes:
1. Default at power-up will be for latched logic inputs to define frequency, as displayed by Bit 3.
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