Re: [usb] USB1.1 Core Address Assignment Failing. Debugging suggestions?

[emailjmja@yahoo.com]

Hello, 

Just a quick thank you. I was having precisely the same problem when 
trying to run the core on an Altera Cyclone device. I only came across 
this discussion today and, sure enough, after playing around with the 
vendor define, the core now works beut. 

I'm using Quartus 2.2, and found that the core only works if I enable 
the 'VENDOR_FPGA define.

Thanks again,

John Atkins

----- Original Message ----- 
From: Evan Jones <ejones@u... > 
To: usb@o...  
Date: Tue, 3 Jun 2003 09:02:36 -0400 
Subject: Re: [usb] USB1.1 Core Address Assignment Failing. 
Debugging suggestions? 

> 
> 
> I'm a little embarrassed now. Just 1 day after posting my original 
> request for help, we got the thing working! 
> 
> On Tuesday, Jun 3, 2003, at 05:05 Canada/Eastern, Rudolf Usselmann 
> wrote: 
> > Function address 0 seems to be strange. Never have seen that 
> ... 
> 
> Well, the bizarre errors that we were seeing were caused by some 
> strange interactions between the 
> 
> We eventually realized the problem because we were reading the 
> "state" 
> variable inside usb_ctrl.v, and it never changed. It turns out that 
> when we examined the compile messages, it was being detected as 
> being 
> stuck at ground, and optimized away. The problem was that when we 
> were 
> intitially compiling the core for our Altera APEX 20K200E, the 
> Quartus 
> II software reported it as not meeting the timing constraints. Then 
> we 
> found the "VENDOR_ALTERA" define (I can't remember which file 
> exactly 
> now) and after setting that, it compiled MUCH faster (because it 
> was 
> optimizing away a bunch of critical things). After all our furious 
> debugging, we started with the USB1.1 function controller source 
> from 
> scratch and it compiled fast enough the first time, and worked the 
> first time! 
> 
> The important question now is, is that "VENDOR_ALTERA" setting 
> supposed to work on the APEX 20K200E chip? Because it doesn't 
> appear to. 
> 
> Thank you for your assistance, and for the USB1.1 core. Once we get 
> the 
> system working more thoroughly, we will be submitting some 
> documentation for the core. 
> 
> Evan Jones 
> 
> -- 
> Evan Jones: http://www.eng.uwaterloo.ca/~ejones/ 
> "Computers are useless. They can only give answers" - Pablo Picasso 
> 
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