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Si5040
Rev. 1.3 79
Reset settings = 0100 0000
Register 134. TxCmuConfig
BitD7D6D5D4D3D2D1D0
Name cmuBandwidth[3:0] cmuMode[2:0]
Type R/W R R/W
Bit Name Function
7:4 cmuBandwidth[3:0] TxCMU Jitter Transfer Bandwidth.
0000 = 180 Hz Valid for CMU modes 2 and 6.
0001 = 1.37 kHz Valid for CMU modes 2 and 6.
0010 Not supported.
0011 Not supported.
0100 = 380 kHz Valid for CMU modes 0 and 1 only.
0101 Not supported.
0110 Not supported.
Note: A manual recalibration (hardRecal = 1 in Register 8) is required after a change in the
CMU jitter transfer bandwidth.
3 Reserved Read returns zero.
2:0 cmuMode[2:0] CMU Mode of Operation.
000 = Referenceless Mode.
001 = Synchronous Reference Clock Mode (This is logically the same as setting the
ltr bit (register135[1])).
010 = Asynchronous Reference Clock Mode.
110 = Looptime Mode with Clean Reference Clock. (Recommended CMU
bandwidth = 1.37 kHz.)
Note: An automatic recalibration is executed after a change in timing mode.
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