Solutions Database

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FPGA Express: How do you specify slew rate in FPGA Express

Record #1483

Product Family:  Software

Product Line:  Synopsys

Problem Title:
FPGA Express: How do you specify slew rate in FPGA Express


Problem Description:
Slew-rate can be specified on I/O after the design
has been 'implemented' in FPGA Express.


Solution 1:

(a) After 'implementing' the design, double-click
on the implemented design in the project window.

This will bring up the constraints window.
The default constraints shown will be the 'ports'.

(b)
The 'ports' display will list all the pins
for a given design.  There is a column in this
display called 'pad'.  Selecting the 'pad'
row, which corresponds to the pin you want, select
the 'define' option.

(c)
A new window will be displayed.  Also, the given row,
which corresponds to the pin of interest will be selected
(the row button will be depressed).  In the new
window, there will be item called 'Slew Rate', which is
where a 'slow' or 'fast' slew can be specified.  Go to
the 'Slew Rate' box and choose 'slow' or 'fast.'
Now, hit the 'ok' button to save your change.


Note, slew rate can only be specified on ports of type
output or inout in FPGA Express v 1.xx



End of Record #1483