What exactly is the At Speed Test ?

[shwetha100]

Can someone clearly explain what at speed test is? I have found similar posts on this website but couldn't get to a post where I understood what it is all about.

Thanks.

 

[GI]

Re: At Speed Test

Hi,

Normally test clocks have low frequencies. At these frequencies basically you can check the connectivity of the nets (e.g. shorts/opens). However you cannot see the real parasitic effects of a functional clock which has higher frequency than test clocks.

At this point using at-speed-clock, which means running the circuit at its functional frequency, you can gather more information (e.g. path delay) and improve the coverage.

Best regards,
Gokhan
---

 

[rca]

Re: At Speed Test

At speed test scan generates two clock cycles for the capture cycle at functional frequency.

 

[dhaval4987]

Re: At Speed Test

At speed test are used in analyzing path delay/transition delay of circuit. Normal tests are good to test 'stuck at' faults but they fail in testing timing behavior of circuits.