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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. 

 

 

 

 

 

 

 

 

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. 

RW 

CDR_3RD_EN 

In tracing mode, enable the symbol rate 

detection when the consecutive three  symbols 

do not skip: 

0

Disable 

1

Enable 

Содержание CMT2300AW

Страница 1: ...ocument are shown in the table below Table 1 Product Models Covered in This Document Part No Frequency Modem Function Configuration Package CMT2300AW 127 1020MHz G FSK OOK Transceiver Register QFN16 B...

Страница 2: ...Parameter Configuration 3 1 1 Basic Parameter Configuration 3 1 2 OOK Demodulation Configuration 4 1 3 FSK Demodulation Configuration 5 1 4 CDR Design Index and Mode Selection 6 1 5 Register Classific...

Страница 3: ...ly speaking the following 3 points are recommended when configuring the Deviation 1 4kHz Deviation 200 kHz and Symbol rate 0 5 Deviaiton 250 kHz 2 Symbol rate 0 25 Deviation that is the modulation ind...

Страница 4: ...ate correctly usually 10 20 symbols The advantage is that the demodulation effect will not be affected if there is a spike mutation in the packet a sudden abrupt increase in amplitude The experience i...

Страница 5: ...to open AFC Method AFC method Recommend selecting the Auto Select CDR Type In the packet mode the user needs to detect Preamble or Sync The symbol rate clock recovery function has to be turned on and...

Страница 6: ...nfigurations in RFPDK Users do not have to select CDR_DET_SEL Automatically select in conjunction with other configurations in RFPDK Users do not have to select CDR_AVG_SEL 2 0 Automatically select in...

Страница 7: ...ol 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...

Страница 8: ...a few ten thousandths This is often because the TX and RX configuration and the mechanism of computing the symbol rate are more advanced such as using a variety of high end TRX products 2 The symbol r...

Страница 9: ...ng to the configuration of the symbol rate When the symbol rate is less than or equal to 50 kHz the TRACING system is selected The system can not only realize the tracking but also correctly sample th...

Страница 10: ...here is an acceptable tradeoff and choice whether to slow down the tracking speed 1 5 Register Classification and Use in the Tx Bank Usually the register of the Tx bank is entirely generated by the RF...

Страница 11: ...e 7 Revise History Records Version No Chapter Description Date 0 8 All Initial release 2017 03 24 0 9 All Add the advice to read AN142 Modify individual typos 2017 07 12 1 0 All Update RFPDK screensho...

Страница 12: ...for inaccuracies and specifications within this document are subject to change without notice The material contained herein is the exclusive property of CMOSTEK and shall not be distributed reproduce...

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