Newbie

[Ste M]

Hi group,
i'm developing with Xilinx ISE 5.2 for a xc9572.
I need to impement a simple buffer open collector but i don't know how.
I found a BUF component but i don't think this is the good choice.

Any idea ?
Regards

 

[Wesley J. Landaker]

Hi group,
i'm developing with Xilinx ISE 5.2 for a xc9572.
I need to impement a simple buffer open collector but i don't know how.
I found a BUF component but i don't think this is the good choice.

If you're instantiating components, you probably want to use an OBUFT.

This link might help:
<http://toolbox.xilinx.com/docsan/xilinx5/data/docs/lib/lib0319_303.html#wp1001394>

You can usually infer this kind of behavior in VHDL with something like:

open_collector_pin <= '0' when (desired_value = '0') else 'Z';

 

[Leon Heller]

Hi group,
i'm developing with Xilinx ISE 5.2 for a xc9572.
I need to impement a simple buffer open collector but i don't know how.
I found a BUF component but i don't think this is the good choice.

http://www.xilinx.com/xlnx/xil_ans_display.jsp?getPagePath=1651

Leon

 

[Wesley J. Landaker]

http://www.xilinx.com/xlnx/xil_ans_display.jsp?getPagePath=1651

(Oddly enough, the sample HDL on that page doesn't match the schematic--the
sense of the enable is inverted.)