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.