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Message
From: wesselin@n...<wesselin@n...>
Date: Tue May 4 10:17:30 CEST 2004
Subject: [usb] Oscillator
Hi,i used a DCM (Digital clock manager) of a virtex II to double a clock
frequency, but it can also div and mult frequency's. Check your spartan
II data sheet or user guide, if you have a DLL or DCM you should be able
to fiddle around with clocks to get your 48 MHz.
Regards,
Egwin Wesselink.
----- Original Message -----
From: M. AbuKhater<perocletos@y...>
To:
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
>
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