CoaxPress support

Hello Mark san,

Thank you. I under stood.

Best Regards,

Ryuji Asaka

Hi,

with a little workaround the TLK6002 should be able to support CoaxPress. It runs with up to 6.25 Gbps and is able to do 8b/10b encoding.

Due to the TLK6002 having integrated termination (100 Ohm differential) this has to be matched to the 75 Ohm impedance of the CoaxPress cables with two 25 Ohm series resistors.

Best regards

Markus Zehendner

Markus,

The CoaXPress standard supports bidirectional communication over single link.

The device you suggested has only single direction of communication over single cable.

So, it cannot be used for CoaXPress products.

Please, advice.

Michael

Michael,

the following picture is from the CoaxPress System Implementation Paper:

The SerDes device is between FPGA and Eqcologic Driver/Receiver and only used for the Downlink. I don't see why this should not work with the TLK6002.

Markus,

You last message is opposite to your previous one, so I am a bit confused.

Lets clarify: do you suggest to replace Eqco devices by TLK6002?

If positive, then you must have uplink implemented, which doesnt exist in TLK6002

If you suggest to replace the Serdes within FPGA, so there is no actual reason to do so:

You need in most cases 4 CoaXPress links, so you must have 2 TLK devices.

While 2 TLK devices cost as half FPGA, and you must have FPGA anyway. There are also many other CONS.

And there is no need to match impedances, as you mentioned in your previous message (TLK doesnt see cable at all).

The main question of this thread is whether TI plan to develop competing device for Eqco?

BTW, the Eqco was acquired by Microchip recently.

Please, advice.

Michael

Michael,

The TLK6002 was just suggested as a SerDes alternative, if the FPGA cannot be used for this feature, not as replacement for the Eqcologic driver.

We also do not plan to develop any competing device regarding the Eqcologic driver. 

Thank you Markus!