Alright then. I am having an issue with the UCF file. I am getting an error
message which says:

ERROR:MapLib:30 - LOC constraint R18 on sram_addr<21> is invalid: No such site
ERROR:MapLib:30 - LOC constraint R16 on sram_addr<22> is invalid: No such site
ERROR:MapLib:30 - LOC constraint P18 on sram_mode is invalid: No such site on

I was thinking it might be related to IOSTANDARD, DRIVE, SLEW statements but
that seems highly unlikely. So far, I have filed a web case with Xilinx. I am
using the full version of ISE 10.1 so it shouldn't be puking due to an
unsupported device. I have triple checked to make sure that I have the correct
target (the ML405 board) targeted in the project. No syntax errors found in the
ucf file either. I'm at a bit of a loss here.

Any ideas? Thanks.

--- In java-processor@yahoogroups.com, "Martin Schoeberl" <martin@...> wrote:
>
> Slew rate is the time a signal needs to change the logic level. If your
> external device has a tight timing (e.g. SRAM) a high slew rate helps.
> For less critical interfaces a slower slew rate reduces electrical
> radiation and noise.
>
> Martin
> ----- Original Message -----
> From: "dslaman0877" <dslaman0877@...>
> To: <java-processor@yahoogroups.com>
> Sent: Monday, July 06, 2009 4:59 PM
> Subject: [java-processor] VHDL syntax question
>
>
> > I've modified the UCF file of the ML401 to port over to the ML405. One
confusing part in the ML401 UCF is starting at line 100
> > and on, there are descriptions added to the memory interface and I don't
understand what they are there for. E.G. -->
> >
> > NET sram_clk IOSTANDARD = LVCMOS33;
> > NET sram_clk DRIVE = 16;
> > NET sram_clk SLEW = FAST;
> >
> > I understand what the SLEW = FAST means, but I don't know what it is there
for. Can anybody tell me what all this means? Thanks
> > in advance.
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>