What is the meaning of at-speed testing?

[wanzuha]

What is the meaning of at-speed testing. it is system speed ?

 

[dolby.yang]

Re: At-speed testing

at speed testing means is a test mode that needs the ATE to test chip at this chip's real work clock frequecy.

 

[wanzuha]

At-speed testing

What will happen if i'm using bist

 

[BrownBear]

Re: At-speed testing

Do you want to test memory or something else ? If memory, then BIST is the cheapest and more reliable solution

 

[silencer3]

Re: At-speed testing

in at-speed testing, launch will happen at hips frequency, but capture will be at slower rate. at-speed testing will give more about transitions, rise, fall and other speed effecting defects.

 

[Monkey]

Re: At-speed testing

For BIST, it means BIST run at real clock speed. The clocks may come from PLL.

 

[tarkyss]

At-speed testing

yes
normally test clock is very slow,
so many problems cannot be found at test clock
at speed test is system speed

 

[ken_ooi]

Re: At-speed testing

yes. at-speed test means test the design at its system speed.
Bist test for memory of IP blocks are usally at-speed (they will design to run at system clk speed).
For scan, the at-speed test happens with at-speed launch and capture during scan_enable pin low.