SI514 Datasheet, PDF (20/36 Pages) Silicon Laboratories – ANY-FREQUENCY IC PROGRAMMABLE XO

Si514
4.2. Register Detailed Description
Note: Registers not shown are reserved. Registers with reserved bits are read-modify-write.
Register 0.
Bit
7
6
5
4
3
2
1
0
Name
LP1[3:0]
LP2[3:0]
Type
R/W
R/W
Default
Varies
Varies
Bit
Name
Function
7:4
LP1[3:0] Sets loop compensation factor LP1. Value depends on VCO frequency.
3:0
LP2[3:0] Sets loop compensation factor LP2. Value depends on VCO frequency.
Register 5.
Bit
7
6
5
4
3
2
1
0
Name
M_Frac[7:0]
Type
R/W
Default
Varies
Bit
Name
Function
7:0
M_Frac[7:0] Fractional part of feedback divider M that sets up the output frequency. Frequency
updates take effect when M_Int[8:3] is written.
Register 6.
Bit
7
6
5
4
3
2
1
0
Name
M_Frac[15:8]
Type
R/W
Default
Varies
Bit
Name
Function
7:0 M_Frac[15:8] Fractional part of feedback divider M that sets up the output frequency. Frequency
updates take effect when M_Int[8:3] is written.
20
Rev. 1.0