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Newbie knohen
Newbie
7,769 Views
Registered: ‎08-26-2013

How can i use inverting clk in SLICE?

clk.PNG

 

 

In this picture, i want to know to use CLK_B instead  CLK.

 

 

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7 Replies
Xilinx Employee
Xilinx Employee
7,765 Views
Registered: ‎07-01-2008

Re: How can i use inverting clk in SLICE?

You will need to add the inversion to the source. 

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Historian
Historian
7,743 Views
Registered: ‎02-25-2008

Re: How can i use inverting clk in SLICE?


@knohen wrote:

 

In this picture, i want to know to use CLK_B instead  CLK.

 


myFlop : process (CLK) is

begin

    if falling_edge(CLK) then

        q <= d;

    end if;

end process myFlop;

 

----------------------------Yes, I do this for a living.
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Observer vjose
Observer
7,723 Views
Registered: ‎08-01-2012

Re: How can i use inverting clk in SLICE?

Hi ,

 

You can use the primitives in the FPGA to invert a clock that is much stable .

 

With regards

Vintu

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Historian
Historian
7,709 Views
Registered: ‎02-25-2008

Re: How can i use inverting clk in SLICE?


@vjose wrote:

Hi ,

You can use the primitives in the FPGA to invert a clock that is much stable .

 


Why would you want to do that when the code snippet I provided does exactly that, without the unnecessary instantiation of primitives?

----------------------------Yes, I do this for a living.
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Observer zhoushihua
Observer
7,687 Views
Registered: ‎04-24-2008

Re: How can i use inverting clk in SLICE?

Use FPGA editor change it, I guess you want do a ECO on a exist nice file.
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Observer zhoushihua
Observer
7,686 Views
Registered: ‎04-24-2008

Re: How can i use inverting clk in SLICE?

Just click on the arrow down button, then you can direct click on the invert path triangle to change the path.
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Historian
Historian
7,676 Views
Registered: ‎02-25-2008

Re: How can i use inverting clk in SLICE?


@zhoushihua wrote:
Use FPGA editor change it, I guess you want do a ECO on a exist nice file.

That's very dangerous. Then the source doesn't match what gets loaded into the FPGA, and the next guy who has to deal with this will wonder what the hell is going on. 

----------------------------Yes, I do this for a living.
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