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Help needed for Pin Allocation for Xilinx ISE4.2

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sanjay

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HI there,

A help is required in the Xilinx ISE 4.2 Software.
I know that xilinx automatically allocates pins for the device architecture.
But we want to allocate pins manually..

Does anybody know how to do it.

Help would be appreciated

Thanks
 

M!k

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there are 2 possibilities:
1. assigning the pins in the constraints editor (not always working)

2. manually editing the constraints file (*.ucf). It can look like that:

NET digit_select<0> LOC=P3;
NET digit_select<1> LOC=P5;
NET digit<1> LOC=P20;
NET digit<0> LOC=P21;

I'd suggest the last method cause there seem to be some bugs in the constraints editor of ISE 4 ....
Note: in the post bartart referred to the syntax is for ISE5.x (containing quotation marks)



Mik
 

KA

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attribute pin_assign : string;
attribute pin_assign of Clock_G : signal is "30";
 

sanjay

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Thank you guys for the reply to my much needed help.
The idea of editing the User Constraint file was really a start.

Well we found out that Xilinx itself has its own software driven GUI which allows you to specify both pin and timing contstaints and this program is known as Xilinx Constraint Editor.

Only found it out today.
But thnks for the hints and the help.

With regards
 

simon2kk

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In ISE 5.1 or later, you can use PACE. It is very easy to use for pin assignment and area constraint.
 

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