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USB 2.0 speed
by Unknown on Feb 20, 2005 |
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Hello,
I am very new to the world of FPGA devices and hardware design in general. In fact, I do not yet even own an FPGA development board... (Any suggestions for a student on a small budget?) Anyway, I am contemplating a "home brew" webcam project, and I was wondering what kind of speed I can realistically expect to push over USB 2.0 link. The USB 2.0 spec claims 480 Mb/S, but most USB devices I have seen don't run at anywhere near that speed, so I am a little suspicious. Thanks, David |
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USB 2.0 speed
by Unknown on Feb 20, 2005 |
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Hi David,
For a cheap FPGA development board, you may have a look at:
https://www.digilentinc.com/Sales/Product.cfm?Prod=S3BOARD
They also have the 400kgate and 1000kgate versions, for an extra
20 to 60 bucks.
I would say that for a beginner, this board has enough fire power
from a features/price ratio point of view ... :)
Take care,
Ovidiu
----- Original Message -----
From: bsd@bsdlazarus.com>
To: usb@opencores.org>
Sent: Sunday, February 20, 2005 2:43 PM
Subject: [usb] USB 2.0 speed
Hello,
I am very new to the world of FPGA devices and hardware design in general.
In fact, I do not yet even own an FPGA development board... (Any
suggestions for a student on a small budget?)
Anyway, I am contemplating a "home brew" webcam project, and I was
wondering what kind of speed I can realistically expect to push over
USB 2.0 link.
The USB 2.0 spec claims 480 Mb/S, but most USB devices I have seen
don't run at anywhere near that speed, so I am a little suspicious.
Thanks,
David
_______________________________________________
http://www.opencores.org/mailman/listinfo/usb
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USB 2.0 speed
by Unknown on Feb 20, 2005 |
Not available! | ||
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The usb spec lists the achievable bandwiths for many scenarios. These
are realistic as far as the usb bus is concerned.
In practice the combination of the usb controllers on the host and the
host operating system often limits the bandwith.
This seems to be getting better so you should use a recent mainboard.
Maybe you can even find chipset tests that can
give you information which chipset achieves the highest throughput with
the least cpu load.
.
A development board with a usb 2.0 phy starting at 92€ is
http://www.trenz-electronic.de/prod/proden18.htm
Kolja Sulimma
bsd@bsdlazarus.com wrote:
Hello,
I am very new to the world of FPGA devices and hardware design in general.
In fact, I do not yet even own an FPGA development board... (Any
suggestions for a student on a small budget?)
Anyway, I am contemplating a "home brew" webcam project, and I was
wondering what kind of speed I can realistically expect to push over
USB 2.0 link.
The USB 2.0 spec claims 480 Mb/S, but most USB devices I have seen
don't run at anywhere near that speed, so I am a little suspicious.
Thanks,
David
_______________________________________________
http://www.opencores.org/mailman/listinfo/usb
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