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Messages - marco.bedani

Pages: [1]
Discussion - Hardware / FT2232H - PWREN# rising up with no reasons
« on: February 24, 2022, 08:53:57 AM »
Hi all,
we developed a PCB with a FT2232H chip in 245 FIFO configuration (see attached scheamtic).

Everything is working fine, except for the fact that sometimes, without no apparently reason, we lose USB communication between the PC and our board.
We think that this occurs when the PWRSAV pin goes high.

See attached image from the oscilloscope for the waveforms:
- pink trace is the VBUS on BCBUS7 (pin 59)
- yellow trace is the PWREN# (pin 60)

Any idea for how to solve this kind of issue?

Discussion - Software / USB data transfer stuck
« on: December 21, 2020, 09:26:58 AM »
Hi all,
we developed a PCB based on FT4222 chip in order to issue a communication channel between a service PC and a Raspberry PC.
The service PC is connected via USB to our PCB and then the FT4222 bridges out a SPI communication channel to the Raspberry PC.
We are using drivers LibFT4222.dll (version and ftd2xx.dll (version 3.2.14..0).

So far, all is working fine and we had no particular difficulty; but now we are facing some problems while trying to download a significant amount of data (approximatively 5 MB).
Here is what happens:
-   Using a desktop PC all works fine (data transfer is complete in about 2 minutes)
-   Using a Dell laptop (Windows 10 OS)
o   on the LEFT USB port, all works fine
o   on the RIGHT USB port, the communication freezes after 10-15 seconds
o   on the RIGHT USB port, using a USB hub, all works fine
o   on the RIGHT USB port, using a USB hub, all works fine
One more important detail: when the communication is in the freeze state, it restarts immediately when we connect a USB memory per on another port.
Any idea for this kind of issue?

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