ics951403 Integrated Device Technology, ics951403 Datasheet - Page 6

• Manufacturer Part Number: ics951403
• Description: Amd-k7 System Clock Chip
• Manufacturer: Integrated Device Technology

0486B—02/23/04
VCO Programming Constrains
VCO Frequency ...................... 150MHz to 500MHz
VCO Divider Range ................ 8 to 519
REF Divider Range ................. 2 to 129
Phase Detector Stability .......... 0.3536 to 1.4142
Useful Formula
VCO Frequency = 14.31818 x VCO/REF divider value
Phase Detector Stabiliy = 14.038 x (VCO divider value)
To program the VCO frequency for over-clocking.
0. Before trying to program our clock manually, consider using ICS provided software utilities for easy
1. Select the frequency you want to over-clock from with the desire gear ratio (i.e. CPU:SDRAM:3V66:PCI ratio) by
2. Write 0001, 1001 (19
3. Read back byte 11-20 and copy values in these registers.
4. Re-initialize the write sequence.
5. Write a '1' to byte 9 bit 7 and write to byte 11 & 12 with the desired VCO & REF divider values.
6. Write to byte 13 to 20 with the values you copy from step 3. This maintains the output spread, skew and slew
7. The above procedure is only needed when changing the VCO for the 1st pass. If VCO frequency needed to be
Note:
1. User needs to ensure step 3 & 7 is carried out. Systems with wrong spread percentage and/or group to group skew
2. If VCO, REF divider values or phase detector stability are out of range, the device may fail to function correctly.
3. Follow min and max VCO frequency range provided. Internal PLL could be unstable if VCO frequency is too fast or
4. ICS recommends users, to utilize the software utility provided by ICS Application Engineering to program the VCO
5. Spread percent needs to be calculated based on VCO frequency, spread modulation frequency and spreadamount
ICS951403
changed again, user only needs to write to byte 11 and 12 unless the system is to reboot.
relation programmed into bytes 13-16 could be unstable. Step 3 & 7 assure the correct spread and skew relationship.
too slow. Use 14.31818MHz x VCO/REF divider values to calculate the VCO frequency (MHz).
frequency.
desired. See Application note for software support.
programming.
writing to byte 0, or using initial hardware power up frequency.
rate.
H
) to byte 8 for readback of 21 bytes (byte 0-20).
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