SI5338 Datasheet, PDF (58/170 Pages) Silicon Laboratories – I2C-PROGRAMMABLE ANY-FREQUENCY, ANY-OUTPUT QUAD CLOCK GENERATOR

Si5338
Register 30.
Bit
Name
Type
D7
D6
D5
PFD_IN_FB[2:0]
R/W
D4
D3
P2DIV_IN[2:1]
R/W
D2
D1
D0
P2DIV[2:0]
R/W
Reset value = xxxx xxxx
Bit
Name
Function
Selects the external input applied to the PFD feedback input. See also Register
48[7].
0: P2DIV_IN (fbclk)
1: P1DIV_IN (refclk)
7:5
PFD_IN_FB[2:0]
2: P2DIV_OUT (P2 divider output) selected
3: P1DIV_OUT (P1 divider output) selected
4: Reserved
5: No Clock selected
6: Reserved
7: Reserved
These two bits and Register 28[5] create a 3-Bit field that selects the input to the
P2 divider [reg30[4:3] reg28[5]] = P2DIV_IN[2:0].
4:3
P2DIV_IN[2:1]
000b: Clock from IN5,IN6 is input to P2 divider
011b: Clock from IN4 is input to P2
100b: No clock is input to P2
All other bit values are reserved.
Sets the value of the P2 the divider.
0: Divide by 1
1: Divide by 2
2:0
P2DIV[2:0]
2: Divide by 4
3: Divide by 8
4: Divide by 16
5: Divide by 32
58
Rev. 0.6