regarding USB device core

hi,
what is the advantage of developing a Usb device core on FPGA.....
where can we use it............
thank you

Basically Usb device is used to communicate with other peripherals which supports USB protocol.

For more information you can search on GOOGLE.

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Shitansh Vaghela

There is none advantage.
Usually one gets an USB circuit and attaches it to FPGA.
A problem remains to implement in FPGA some FIFO buffer and FSM
to build some protocol implementation.

if no advantage what could be the possible applications by this

Aser said:

There is none advantage.
Usually one gets an USB circuit and attaches it to FPGA.
A problem remains to implement in FPGA some FIFO buffer and FSM
to build some protocol implementation.

Click to expand...

If you get USB circuit then it will work for specific application only. e.g.mass storage or any perticular applicatein, but for other application you have to interface another usb circuit!! this is disadvantage of ASIC USB chip.

Instead you have USB device core, then you can use it as mass storage or for any application by configuring same usb core this will be advantage.

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Shitansh Vaghela

I see three reasons for USB core in FPGA.

1. If the requirement of this design is only a few devices, then its not practical to go for ASIC because the NRE cost for an ASIC is too high. So whenever we have the final chip count too low, you can go for an evaluation of FPGA and ASIC costs and decide on which is lower.

2. USB core is implemented in FPGA more as a validation process. Once implemented and tested we know that full functionality is correct and then decide to go onto ASIC. Any bugs caught during FPGA emulation can be fixed immediately since its only a matter of reprogramming the FPGA, whereas it would prove too costly in a ASIC.

3. USB in FPGA is used to develop software stack in advance while the actual ASIC is not yet ready.


Cheers,
eChipDesign.

Added after 1 minutes:

And regarding the question where can we use it, it can be used everywhere a ASIC USB device can be used.


Cheers,
eChipDesign