Re: Embedded Linux and PCI (over AT91?)

On Dec 28, 4:50 pm, bill.valo...@xxxxxxxxx wrote:

For example, the on-chip USB 2.0 is only
full-speed, which may be too slow for a video stream

I thought 'full speed' applied to USB 1 / 1.1 and that 2.0 devices had
to be able to go faster than that?

Anyway, to talk to a usb disk you also need a device which implements
the USB host and not simply a USB device interface.

Assuming you are writing compressed video data, USB full speed
probably is fast enough for most purposes. If I recall correctly USB
full speed is 12 mbit/second minus overhead, wheras the official limit
for DVD's is a little under 10 mbit/second. But if you can't do good
compression before writing it you might have to go faster.

Most current usb flash disks will write on the order of 5 MByte/second
when used with USB2.0, but those a little older may be substantially
slower.

Looking at your requirements, an embedded x86 platform probably is the
best choice. You can buy an entire micro laptop with usb2.0, 2g
internal storage, and display (Asus EeePC 2g) for the $300 we're
paying for an embedded blackfin module

.