8b/10b encoder/decoder is hard core for 7series devices?

[muuu]

Hi,

Is 8b/10b encoder/decoder hard core for 7series devices?

Thank you!

Muuu

[simon]

Hi @muuu 

Yes.

[avrumw · Accepted solution]

Let me (perhaps) be clearer.

An 8b10b encoder/decoder is integrated into the 7 series high speed transceivers (GTP, GTX, GTH - I can't tell for GTZ). The 8b10b cores are only useable as part of the high speed transceiver - they cannot be used by the fabric for "general" 8b10b encoding/decoding.

As part of the transceivers, they are "hard logic". But I would be careful of referring to them as "cores" - a core is something that can be instantiated; the 8b10b encoder/decoder are part of the transceiver cores; they are not cores themselves.

If you need to do 8b10b encoding/decoding not as part of the high speed transceiver cores, then you will need to implement the 8b10b functionality in soft logic - there isn't even an IP core for that...

Avrum

[borisq]

hi @muuu 

in the serial transceivers or GTs, 8b10b encoder and decoder are part of the hard GT ip. it cannot be used by user logic without using trasnceiver. it is not standalone.

we have soft 8b10b encoder and decoder as well. it is implemented in fabric logic. you can use it in your user logic without GTs.

below is the download link for document and source files.

encoder:

https://www.xilinx.com/support/documentation/application_notes/xapp1122.pdf

https://www.xilinx.com/member/forms/download/design-license.html?cid=113637&filename=xapp1122.zip

decoder:

https://www.xilinx.com/support/documentation/application_notes/xapp1112.pdf

https://www.xilinx.com/member/forms/download/design-license.html?cid=113592&filename=xapp1112.zip

Thanks,

Boris

[muuu]

thank you for your reply!
so it is impossible to implement our soft-logic 8b10b encoder/decoder working with high speed transceiver.
is it right?

[borisq]

hi @muuu 

it is possible.

the 8b10b encoder and decoder in high speed transceivers can be disabled.

and you can use your soft 8b10b in the fabric.

Thanks,

Boris

[muuu]

Thank you,
Muuu