8b/10b in altgx

[vkc]

Hii,I am working on sata protocol,I am using stratix 4 device for the same and I have enabled 8b/10b encoding scheme, I have used the word alignment pattern as 0010111100(k28.5) on both transmitter and reciever.

I am getting incorrect data at the reciever and rx_errordetect signal is high, can anyone help me solve this.

[SengKok_L_Intel]

Hi

Are you performing a loopback test (TX -> RX)? Is this internal or external?

Can you please start with 8 bits data first for easier debugging, and then do let us know what data actually receive at the receiver?

Regards -SK

[vkc]

Hii, when i sent BC(k28.5) from the transmitter side my making the control code 1 i have recieved data correctly at the reciever .But when i sent a D word(01100110) by making control code 0 on the reciever side i have recieved as (01111001).

I have gone through stratix 4 transciever architecture specifications, according to my understanding for valid k groups control code has to be made 1 and for D words it is 0. Correct me if I am wrong.

[SengKok_L_Intel]

Yes, your understanding is correct in terms of the control code. As per the following link (page 27), after reset, did you send enough K28.5 for synchronizing before transmitting data?

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/stratix-iv/stx4_siv52001.pdf

Regards -SK

[SengKok_L_Intel]

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