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Message
From: tomko@h...
Date: Wed, 22 Oct 2003 06:16:46 +0200
Subject: [usb] usb1.1 PHY core clock frequency
I would like to ask some question about FS usb:
1.why the usb1.1 PHY need to supply with a 48 MHZ(4x data streaming
rate), can i just input a 12MHZ clock?
2.what should be the frequency of the clock for the remain usb core
(UTMI, Protocal Layer.......) , should it be 12MHZ if using full speed
mode?
3.Where should the clock of the remain usb core be generate out ? from
PHY ? or from the external cycstal oscillator?
Thank you very much.
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