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Author Topic: FT600/601 Question about maximum data rate (practical)  (Read 167 times)

lordcape

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FT600/601 Question about maximum data rate (practical)
« on: February 07, 2018, 07:04:30 PM »

Hi. I have a proposal for a project where I have to manage the samples of an ADC of 8 bits @ 100 MHz. I have to deliver the samples to a PC quite fast, so I think that the FT600/601 would be a nice choice for that. The thing is that I've used in the past the FT232H with the FIFO sync mode (60 MHz clk FIFO) and the bottleneck where in FTDI D2xx drivers...they limited my data transfer speed much below the 480 Mbits of USB 2.0 (and in Windows worked faster than Linux, FTDI support said in that moment).

So I write this post to ask you if you (people of FTDI) have a practical (not the theoretical 5Gbps) number of the transfer rate in MB/s with the FT600/601 working in SYNC FIFO using D3xx drivers. My application needs 100 Ms/s maximum but if I use the 32 bits parallel FIFO I only would need 25 Ms/s. I would like to have a good margin to be sure that I don't loose samples (as in my FT232H old project)....

Thanks and regards

SR
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FTDI Community

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Re: FT600/601 Question about maximum data rate (practical)
« Reply #1 on: February 09, 2018, 04:10:45 PM »

Hi,

Thanks for your question. If you email support directly on support1@ftdichip.com they can take a look more closely at your question and get back to you.

Thanks,
FTDI Community
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asmi

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Re: FT600/601 Question about maximum data rate (practical)
« Reply #2 on: February 10, 2018, 02:40:29 AM »

I have FT601 on my own custom board with Artix-7 FPGA. When FT601 is configured in 1IN/1OUT (single bidirectional pipe) mode, I was able to get ~330 MBytes/s of "real" read bandwidth (meaning this was a rate I was getting an actual data out of D3XX API, so all overheads are factored in), same chip on a same board with FT in 2IN/2OUT mode - I was getting ~220 MBytes/s of read bandwidth out of a single IN pipe. The board used FT601 with 32bit bus running at 100 MHz and with Vccio of 3.3V.

Please note that you can configure FT to only have a single IN (or OUT) unidirectional pipe if you don't need two-way communications (or if 2 GPIOs are enough for your OOB needs), this will likely push the bandwidth towards 400 MBytes/s or so.

So that's going to be more than enough for your application. Infact you can probably get away with 16bit model, but don't quote me on this.
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