On Sat, 4 Jul 2009 06:06:43 +0800, Walter wrote
(in article <[email protected]>):

> Jonathan Bromley escribió:
>> On Fri, 3 Jul 2009 10:44:18 -0700 (PDT), Walter wrote:
>>
>>> where is the "extra" signal ?
>>> TRIG2(x) must be directly connected to FFx;
>>
>> I agree that there is no new hardware.
>>
>> In the original post, steve wrote:
>>
>>> TRIG2(31 downto ????) => fifo_cntl_cs ,
>>
>> In other words, TRIG2() is not a signal in
>> his design; it's a port on the ChipScope
>> instance. So it's impossible to write what
>> you suggested; it's necessary to declare
>> an additional signal, use the three assignments
>> to put the appropriate values on that signal,
>> and then attach that signal to the ChipScope
>> port.
>>
>> Nothing more than that: you need to declare
>> a suitable signal.
>
> I agree, as basic as I forget to mention...
>
> Here a more "complete" simple solution to a simple problem.
>
> ..
> SIGNAL TRIG2 : std_logic_vector(31 DOWNTO 0);
>
>
> ..
> TRIG2(31) <= '1' WHEN fifo_cntl_cs = IDLE ELSE '0';
> TRIG2(30) <= '1' WHEN fifo_cntl_cs = RD_REQ ELSE '0';
> TRIG2(29) <= '1' WHEN fifo_cntl_cs = WR_REQ ELSE '0';
>
> --- IN CHIPSCOPE INSTANCE ---
> ...
> TRIG2 => TRIG2,
> ...
>
> When in trainings I recommend to all write code as simple as possible,
> many times "complex" solutions or no common used structures are poorly
> supported or totally unsupported in one or other synthesis tool.
> I like your solution as generic solution, but if I have a more
> "standard" or low level solution, thinking in the synthesis tool, I take
> it.
>
> Walter.
>

Hi walter,

It's only 'simple' if you are a diehard VHDL programmer , I'm 2 weeks into
this, have all the xilix documentation and god knows how many VHDL books
No where in chipscopes manuals is this mentioned, but it is exactly the sort
of thing people need to debug.

But what is really anoying , is the fact that you cannot turn off sections
of VHDL optimization to stop signals disappearing. (yes I know about keep and
noopt ,but they don't make a difference)

Steve