Silicon Laboratories SI5351A/B/C Product Manual page 29

Register 15. PLL Input Source
Bit D7
Name
Type R/W
Reset value = 0000 0000
Bit Name
7:4 Reserved Leave as default.
3 PLLB_SRC Input Source Select for PLLB.
0: Select the XTAL input as the reference clock for PLLB (Si5351A/C only).
1: Select the CLKIN input as the reference clock for PLLB (Si5351C only).
2 PLLA_SRC Input Source Select for PLLA.
0: Select the XTAL input as the reference clock for PLLA.
1: Select the CLKIN input as the reference clock for PLLA (Si5351C only).
1:0 Reserved Leave as default.
D6 D5
R/W R/W
Preliminary Rev. 0.95
D4 D3
PLLB_SRC PLLA_SRC
R/W R/W
Function
Si5351A/B/C
D2 D1
R/W R/W
D0
R/W
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