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AN149
Rev 1.0 | 7/12
www.cmostek.com
Table 5. CDR Related Register Instructions
8.5
Bit
R/W
Bit Name
Function Description
CUS_CDR1
(0x2B)
6:4
RW
CDR_AVG_SEL<2:0>
In Tracing mode, the average filter order of the
CDR output:
0
:
6/8
1
:
1/2
2
:
6/16
3
:
1/4
4
:
11/64
5
:
1/8
6
:
3/32
7
:
1/16
3:2
RW
CDR_RANGE_SEL<1:0>
In Tracing mode, the maximum deviation range of
the symbol length for the CDR: 0
:
+/-6.3%
(
Symbol rate range -5.9% to
+6.7%
)
1
:
+/-9.4%
(
Symbol rate range -8.6% to
+10.4%
)
2
:
+/-12.5%
(
Symbol rate range -11.1% to
+14.3%
)
3
:
+/-15.6%
(
Symbol rate range -13.5% to
+18.5%
)
1:0
RW
CDR_MODE<1:0>
CDR working mode selection: 0
:
Tracing
1
:
Counting 2
:
Manchester 3
:
No CDR
Details are given below.
7
RW
CDR_DET_SEL
In tracing mode, select the method to detect
the symbol rate:
0
:
Method 0
1
:
Method 1
The default selection is method 1.
6
RW
CDR_3RD_EN
In tracing mode, enable the symbol rate
detection when the consecutive three symbols
do not skip:
0
:
Disable
1
:
Enable