How can I find Rise/fall time of xilinx FPGA?

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jay_ec_engg

Joined: 19 Jun 2004
Posts: 157
Helped: 1
Location: India

08 Apr 2005 8:06 How can I find Rise/fall time of xilinx FPGA?

How can I find rise and fall time of output signals from XILINX FPGA ? Will it generate any file after synthesis which will provide this sinformation ?

hill

Joined: 17 Jun 2004
Posts: 285
Helped: 9

08 Apr 2005 10:06 How can I find Rise/fall time of xilinx FPGA?

My method is using digital oscilloscope (Yokogawa DL1540).

Johnson

Joined: 04 Oct 2004
Posts: 730
Helped: 22

08 Apr 2005 10:07 Re: How can I find Rise/fall time of xilinx FPGA?

on Xilinx main datasheet, which is available on site! The fields on datasource CD is not complete!

jay_ec_engg

Joined: 19 Jun 2004
Posts: 157
Helped: 1
Location: India

08 Apr 2005 13:59 Re: How can I find Rise/fall time of xilinx FPGA?

I have to do timing analysis for output signals from spartan-3 fpga before actual testing (before board comes). So i cant use oscilloscope. Datasheet also doesnt have rise/fall time information. Can I get this info from any of the report file after synthesis ?

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au_sun

Joined: 05 Aug 2004
Posts: 148
Helped: 10

08 Apr 2005 18:52 Re: How can I find Rise/fall time of xilinx FPGA?

u get rise time and fall time information from the REPORT after XST synthesis,
the report contains MAX frequency, and all other timing estimates for the I/O signals of the design

power-twq

Joined: 10 Jun 2005
Posts: 374
Helped: 3

18 Jun 2005 14:31 Re: How can I find Rise/fall time of xilinx FPGA?

The rise and fall time is determined by fpga output's drive ability and

capacitance loading (pcb trace, etc.). you may not find it after synthesis.

but you can find it after PCB simulation.

best regards

jay_ec_engg wrote:

How can I find rise and fall time of output signals from XILINX FPGA ? Will it generate any file after synthesis which will provide this sinformation ?