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.
>
>
>
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