Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
7 years ago

LVDS Signal DC offset and AC Swing

Hi, What is the value of LVDS DC offset and LVDS AC Swing of Cyclone 10 GX devices?
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
7 years ago

Why do you refer to Cyclone V GX instead of Cyclone 10 GX documents? The relevant are the transceiver PHY user guide https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/hb/cyclone-10/ug_cyclone10_xcvr_phy.pdf and the datasheet https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/hb/cyclone-10/c10gx-51002.pdf

However neither C5GX nor C10GX have programmable transceiver Vocm level. Datasheet specifies 0.65 V for C5GX and 0.4/0.5 V for C10GX. Setting transceiver Vocm to 1.25 V LVDS value is simply impossible due to the low transceiver supply voltage.

You didn't yet answer the question about AC coupling option. What's your application?