Forum Discussion

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

Fpga_"PHY" to RJ45 with transformer

Hello guys, I want to connect the Pluto2 fpga board which is trasmitting only to a Pulse RJ45 J006. I will connect the pin_4 to a 100nF Cap on th GND. And i am not sure about what to do ne...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

- The slow oscillation shouldn't be present. It's caused by the 100 nF capacitor I fear. Simply try to omit it.

- The waveform looks not exactly as specified by the IEEE 802.3, Section 1, Clause 14 "Twisted-pair medium attachment unit (MAU) and baseband medium, type 10BASE-T". It basically misses the low-pass filter. Practically, this doesn't matter, because the peer will filter signal before processing it.

By the way, do you also generate a link test pulse? I'm not sure, if some receivers possibly require it.