Undocumented units in Virtex (I assume in Spartan-II too)

[Sergey Yemets]

Hi.

I have found "CAPTURE SITE" viewing Virtex die in FPGA editor.
(down-left corner of die).
The site has two inputs only (clk,cap).

I think that the "CAPTURE" belongs to JTAG functionality, but I am not
sure.
I can't find any record of the unit (at Xilinx site).

Does somebody know the goal of this unit?
(I've find explanation about similar units "RPCILOGIC,LPCILOGIC" in
the group only).

Thanks,
Sergey.

 

[Sean Durkin]

Sergey Yemets wrote:

Hi.
I have found "CAPTURE SITE" viewing Virtex die in FPGA editor.
(down-left corner of die).
The site has two inputs only (clk,cap).
I think that the "CAPTURE" belongs to JTAG functionality, but I am not
sure.
I can't find any record of the unit (at Xilinx site).
Does somebody know the goal of this unit?
(I've find explanation about similar units "RPCILOGIC,LPCILOGIC" in
the group only).
Have a look at this:

http://toolbox.xilinx.com/docsan/xilinx5/data/docs/lib/lib0081_65.html#wp1000931

--
Sean Durkin
Fraunhofer Institute for Integrated Circuits (IIS)
Am Wolfsmantel 33, 91058 Erlangen, Germany

mailto:23@iis.42.de
([23 , 42] <=> [durkinsn , fraunhofer])