HD151TS206SS Datasheet, PDF (16/34 Pages) Renesas Technology Corp – Mother Board Clock Generator for Intel P4+ Chipset (Springdale)

HD151TS206SS
I²C Controlled Register Bit Map (cont.)
How to set VCO2 frequency to 666 MHz.
Write
Byte17
0 0 0 10 1 1 0
ON
6
Byte18
0 1 1 00 1 1 0
6
6
max 720
min 200
How to read actual frequency of VCO2 and CPU clock
Byte17[4] = 1
Actual VCO2 freq. read back.
Byte19
0 1 1 00 1 1 0
Byte20
0 1 1 01 0 0 0
6
6
6
8
Note:
Case of VCO2 = 666.8 MHz.
Other clock frequency are able to read using the same way as shown at upper.
Byte19, Byte20 = Read back of VCO2 actual frequency.
Byte21, Byte22 = Read back of CPU actual frequency.
Byte19 Control Register
Bit Description
7
VCO2 Frequency Read
Bit15
6
VCO2 Frequency Read
Bit14
5
VCO2 Frequency Read
Bit13
4
VCO2 Frequency Read
Bit12
3
VCO2 Frequency Read
Bit11
2
VCO2 Frequency Read
Bit10
1
VCO2 Frequency Read Bit9
0
VCO2 Frequency Read Bit8
Contents
Calculation result of VCO2 frequency.
100 MHz digit
0000 = 0, 0001 = 1 …. 1001 = 9
Calculation result of VCO2 frequency.
10 MHz digit
0000 = 0, 0001 = 1 …. 1001 = 9
Type Default Note
R
0
R
0
R
0
R
0
R
0
R
0
R
0
R
0
Rev.1.00, Apr.28.2003, page 16 of 34