SI514 Datasheet, PDF (23/36 Pages) Silicon Laboratories – ANY-FREQUENCY IC PROGRAMMABLE XO

Si514
Register 11.
Bit
7
Name
Type
R/W
Default
6
5
4
LS_DIV[2:0]
R/W
Varies
3
2
R/W
R/W
1
0
HS_DIV[9:8]
R/W
Varies
Bit
Name
Function
7
Reserved
6:4
LS_DIV[2:0] Last output divider stage. Used during large frequency changes. To update, follow
large frequency change procedure. LS_DIV value updates asynchronously.
000: divide-by-1
001: divide-by-2
010: divide-by-4
011: divide-by-8
100: divide-by-16
101: divide-by-32
All others reserved.
3:2
Reserved
1:0 HS_DIV[9:8] Integer divider that divides VCO frequency and provides output to LS-DIV. Follow the
large frequency change procedure when updating. The allowed values are even num-
bers in the range from 10 to 1022 (i.e., 10, 12, 14, 16, ..., 1022). The decimal value
represents the actual divide value (i.e., 12 means divide-by-12).
Register 14.
Bit
Name
Type
Default
7
6
R/W
R/W
5
4
OE_STATE[1:0]
R/W
0
0
3
2
1
0
R/W
R/W
R/W
R/W
Bit
Name
Function
7:6
Reserved
5:4 OE_STATE[1:0] Sets logic state of output when output disabled.
00: high impedance
10: logic low when output disabled
01: logic high when output disabled
11: reserved
3:0
Reserved
Rev. 1.0
23