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Altera_Forum
Honored Contributor I
986 Views

1.5V PCML to CML interface

Hello, I need to interface the TX serdes output (ALTGX) of a cyclone IV GX device to the input of a NB7L111M device https://www.onsemi.com/pub/collateral/nb7l111m-d.pdf 

My problem is that serdes out is 1.5V PCML standard while the differential driver NB7L111M accepts CML input. 

Do I have to connect output of cyclone ALTGX to NB7L111M input as show in figure 18 of NB7L111M datasheet? 

Any help is appreciated
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2 Replies
Altera_Forum
Honored Contributor I
114 Views

The short answer is yes. That is how you need to connect it up. 

 

Refer to Altera's "the evolution of high-speed transceiver technology (https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/wp/wp_hs_transceiver.pdf)" white paper. The P in PCML is for Pseudo. Altera haven't implemented the CML driver exactly as per the CML specification. Hence the new interface acronym. However, they're designed to interoperate. 

 

Cheers, 

Alex
Altera_Forum
Honored Contributor I
114 Views

Hey mate I have looked for it but couldnt solve it either!! Sorry!! but my thinking is now impaired. took some pills from some pharmacy reviews (https://pharmacyreviews.md) that i searched. maybe later i may find an answer. as for now sorry that i can't help.

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