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Visitor gagawudi
Visitor
479 Views
Registered: ‎02-19-2019

About speed grade of FPGA

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I generated a bitstream with ISE14.4 in Virtex5(XC5VFX130T) and the speed grade is -1. If I programming the bitstream in the speed grade of -2. Could it work Correct,and What's the impact?

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Explorer
Explorer
452 Views
Registered: ‎07-18-2018

Re: About speed grade of FPGA

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Hi @gagawudi,

    The bitstream at -1 should work with faster speed grade devices. For ISE you can actually run your timing check with a different speed grade selected if you have you r.ncd and .pcf files.

Just add the -s option to change the target speedgrade when calling TRACE.

If that passes, you know you are good with the design working on the other speed part. As it took your design and requirments and checked with the -2 part numbers.

As for the impact, it shouldn't make any real difference. A -1 part in theory could be a -2 part binned lower. To get much of the benifit of a faster part you should rebuild with the faster part and change your requriments. Otherwise it will run as a normal -1 part.

 

2 Replies
Explorer
Explorer
453 Views
Registered: ‎07-18-2018

Re: About speed grade of FPGA

Jump to solution

Hi @gagawudi,

    The bitstream at -1 should work with faster speed grade devices. For ISE you can actually run your timing check with a different speed grade selected if you have you r.ncd and .pcf files.

Just add the -s option to change the target speedgrade when calling TRACE.

If that passes, you know you are good with the design working on the other speed part. As it took your design and requirments and checked with the -2 part numbers.

As for the impact, it shouldn't make any real difference. A -1 part in theory could be a -2 part binned lower. To get much of the benifit of a faster part you should rebuild with the faster part and change your requriments. Otherwise it will run as a normal -1 part.

 

Visitor gagawudi
Visitor
442 Views
Registered: ‎02-19-2019

Re: About speed grade of FPGA

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highly detailed,very  thanks

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