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Trenz Electronic GmbH Support Forum

Trenz Electronic Products => Trenz Electronic FPGA Modules => Topic started by: tcogo on October 22, 2018, 12:29:51 PM

Title: TEBF0808-04 and TE0803 FMC LPC polarity inversion
Post by: tcogo on October 22, 2018, 12:29:51 PM
I want to plug a custom FMC LPC on startter kit using TEBF0808-04 and TE0803-01-03EG-1E.
I wanted to find witch ZynqMp pins are connected to FMC pins.
I hva seen a polarity inversion on 3 pairs I have tryed to wire :
The LA22_P (FMC-G24) seem to be wired on a negative pin on the ZYNQ : T8 (B65_L4_N)
The LA27_P (FMC-C26) seem to be wired on a negative pin on the ZYNQ : V8 (B65_L3_N)
The LA21_P (FMC-H25) seem to be wired on a negative pin on the ZYNQ : J2 (B65_L9_N)

I have checked with the schematics also and obtain the same result.

I found this inversion is really strange ? Is there any errors on the schematics ?
Title: Re: TEBF0808-04 and TE0803 FMC LPC polarity inversion
Post by: Oleksandr Kiyenko on October 22, 2018, 02:49:16 PM
Hello.
There is no error, such connection made because of strict routing requirements. If you use this signals as a differential pair, the signal should be inverted after input differential buffer or before output differential buffer.

Best regards
Oleksandr Kiyenko
Title: Re: TEBF0808-04 and TE0803 FMC LPC polarity inversion
Post by: tcogo on October 22, 2018, 06:41:42 PM
Thank you for your fast  answer !
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