ICS9FG1904B-1 Datasheet, PDF (5/22 Pages) Integrated Circuit Systems – Frequency Generator for CPU, PCIe Gen 1, PCIe Gen 2 & FBD

Integrated
Circuit
Systems, Inc.
ICS9FG1904B-1
ICS 9FG1904B-1 Programmable Gear Ratios
CLK_IN Geared DIF
(CPU FSB) Outputs M n ^Gear
MHz
MHz
Ratio n/M
(FS_A_410#)
Byte 0,
bit 4
FS4
100.00
133.33 3 4 1.333
0
100.00
166.67 3 5 1.667
0
100.00
200.00 1 2 2.000
0
100.00
266.67 3 8 2.667
0
100.00
333.33 3 10 3.333
0
100.00
400.00 1 4 4.000
0
133.33
166.67 4 5 1.250
0
133.33
200.00 2 3 1.500
0
133.33
266.67 1 2 1.250
0
133.33
333.33 2 5 1.500
0
133.33
100.00 4 3 0.750
0
166.67
133.33 5 4 0.800
0
166.67
200.00 5 6 1.200
0
166.67
266.67 5 8 1.600
0
160/
320/
1 2 2.000
0
166.67
333.33
166.67
400.00 5 12 2.400
0
200.00
133.33 3 2 0.667
1
200.00
166.67 6 5 0.833
1
200.00
266.67 3 4 1.333
1
200.00
333.33 3 5 1.667
1
200.00
400.00 1 2 2.000
1
266.67
133.33 2 1 0.500
1
266.667/
166.67/
8 5 0.625
1
320.00
200.00
266.67
200.00 4 3 0.750
1
333.33
133.33 5 2 0.400
1
320/
160/
2 1 0.500
1
333.33
166.67
333.33
200.00 5 3 0.600
1
400.00
133.33 3 1 0.333
1
400.00
160.00 5 2 0.400
1
400.00
166.67 12 5 0.417
1
400.00
320.00 5 4 0.800
1
400.00
333.33 6 5 0.833
1
Notes:
1. Targetted input/output frequency pairs
2. This Gear is also used for 160MHz/320 MHz.
3. Gear Ratio 5/4 is power up default for FS_A_410 = 1
4. Gear Ratio 3/1 is power up default for FS_A_410 = 0
5. This Gear is also used for 400MHz/200MHz
6. This Gear is also used for 320MHz/200MHz
1255B—08/03/07
Byte 0, Byte 0, Byte 0, Byte 0,
bit 3 bit 2 bit 1 bit 0 Notes
FS3 FS2 FS1 FS0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
1
0
1
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1,3
1
1
0
0
1
1
1
0
1
1
1
1
0
1,2
1
1
1
1
0
0
0
0
1
0
0
0
1
1
0
0
1
0
1
0
0
1
1
1
0
1
0
0
1
0
1
0
1
1
0
1
1
0
1, 6
0
1
1
1
1
1
0
0
0
1
1
0
0
1
1,5
1
0
1
0
1
1
0
1
1
1,4
1
1
0
0
1
1
1
0
1
1
1
1
1
0
1
1
1
1
1
1
5