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ICS950208 Datasheet, PDF (6/19 Pages) Integrated Circuit Systems – Programmable Timing Control Hub for P4
◁
Integrated
Circuit
Systems, Inc.
ICS950208
Byte 0: Functionality and frequency select register (Default=0)
Bit
Description
Bit
(2,7:4)
Bit 3
Bit 1
Bit 0
Bit2 Bit7 Bit6 Bit5 Bit4 CPUCLK
FS4 FS3 FS2 FS1 FS0
MHz
3V66
MHz
PCICLK
MHz
0000 0
102.00
68.00
34.00
0000 1
105.00
70.00
35.00
00010
108.00
72.00
36.00
0001 1
111.00
74.00
37.00
0 0 10 0
114.00
76.00
38.00
0 0 10 1
117.00
78.00
39.00
00 11 0
120.00
80.00
40.00
00 11 1
123.00
82.00
41.00
0 100 0
126.00
72.00
36.00
0 100 1
130.00
74.30
37.10
0 10 1 0
136.00
68.00
34.00
0 10 1 1
140.00
70.00
35.00
0 1 10 0
144.00
72.00
36.00
0 1 10 1
148.00
74.00
37.00
0 111 0
152.00
76.00
38.00
0 111 1
156.00
78.00
39.00
10 00 0
160.00
80.00
40.00
10 00 1
164.00
82.00
41.00
10 0 1 0
166.60
66.60
33.30
10 0 1 1
170.00
68.00
34.00
10 10 0
175.00
70.00
35.00
10 10 1
180.00
72.00
36.00
10 11 0
185.00
74.00
37.00
10 11 1
190.00
76.00
38.00
1 100 0
66.80
66.80
33.40
1 100 1
100.20
66.80
33.40
1 10 1 0
133.60
66.80
33.40
1 10 1 1
200.40
66.80
33.40
1 1 10 0
66.60
66.60
33.30
1 1 10 1
100.00
66.60
33.30
1111 0
200.00
66.60
33.30
1111 1
133.33
66.60
33.30
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
Spread %
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
+/-0.25% Center spread
0 to -0.5% Down spread
0 to -0.5% Down spread
0 to -0.5% Down spread
0 to -0.5% Down spread
Note 1
0
0
0
Notes:
1. Default at power-up will be for latched logic inputs to define frequency, as displayed by Bit 3.
0464B—08/04/03
6
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