---
# System prepended metadata

title: Regular Meeting (2020.2.24)
tags: [Regular Meeting, DeWei]

---

# Regular Meeting (2020.2.24)

## Completed
* Testing ibert-GTY

* Hough Transform for curve detect (opencv+python)


## Ibert 
* Using example files
* Transrate: **25Gbps x 4ch**
* Fiber loop-back 
![opt-modules](https://i.imgur.com/mH37m5q.jpg)
* Result
![I-bert-result](https://i.imgur.com/2XMCTzA.png)
* ibert-test without encoding with 8B/10B or 64B/66B ... etc.
![arch-GTY](https://i.imgur.com/83AQ2Em.png)
* What's the ibert (LFSR)?
![lfsr-gif](https://i.pinimg.com/originals/cf/3d/02/cf3d02eac2e6b573a9025fe6e5550836.gif)
* Both (LFSR + Scrambler) and 8B/10 provide DC-Balance
    * LFSR detected error is not directly
        * if we sent random data, how to detect error in receiver
    * LFSR without control code

* Why we need DC-Balance in Hi-Speed transmission circuit
![DC-bal-ac-couple](https://i.imgur.com/LXCNqcM.png)
![DC-bal-8b-10b](https://i.imgur.com/Fj0V1FB.png)

* Some probles
    * I can't specify ref-clk (refclk-0, refclk-1) if I use ibert-IP
        * UT-3 board layout refclk-0, refclk-1 to same clock, maybe UT-4 is the same.
![gty-clks-0](https://i.imgur.com/W1jHAYw.png)
![gty-clks-1](https://i.imgur.com/jds4KmJ.png)
![gty-clks-ibert]()

## Hough Transform for curve detect

* Compare equtions
    * Hough transform for strength line
    ![](https://i.imgur.com/0DpopdT.png)
    * Hough transform for curve
    ![](https://i.imgur.com/zwFBNyY.png)

Threashole = 30

* Hough transform for curve
![](https://i.imgur.com/QC6zAsd.jpg)
![](https://i.imgur.com/HrijxW1.jpg)

* Hough transform for strength line
![](https://i.imgur.com/tLTbsAD.jpg)

###### tags: `Regular Meeting` `DeWei`