Message

Reply | Reply all

Date Prev | Date Next | Thread Prev | Thread Next Date Index | Thread Index

From: M. AbuKhater<perocletos@y...>
Date: Sun May 2 11:58:53 CEST 2004
Subject: [usb] Oscillator
hello all
I was wondering where can I get a 48MHz oscillator, the available one are 50 and 45. the FPGA board I am using has a dividable 100MHz, so I can get 50 or 33.3 or 25 .... MHz. the USB1.1 core needs a 48MHz.
I brought a 48 MHz crystal, but the circuit with 74F04 inverters is not working on well, it seems the frequiency is so high. should I try CMOS inverters or is there any better solution.
I know there is a DLL (or PLL) inside the Spartan II FPGA, can I get a 48 M out of it?

one more thing
what is the function of the following ports in the USB1.1 core:

Vendor_data<15:0>
ep_sel<3:0>
wIndex<15:0>
wVAlue<15:0>
v_set_feature:
v_set_int

thanks in advance

M. Abukhater


---------------------------------
Do you Yahoo!?
Win a $20,000 Career Makeover at Yahoo! HotJobs
-------------- next part --------------
An HTML attachment was scrubbed...
URL: attachment.htm