clock frequency when doing scan capture

scan chain tutorial

hi;
im wondering why we need to apply a clock pulse in fonctionnal mode?
could u give a good explanation for the scan sequence.
thanx

scan chain asic

Triggering clock pulse between scan shift is usually appeared in capture cycle. In which the injected test pattern has been applied to internal combo. logic. An extra clock pulse (capture clock) is used to latch the internal combo. output to scan FF and then shift out for measurement.

vector scan sequence

In order to test the manufactured design, the scan-chain method is often used.
Because the objective of scan-chain circuits is mainly to test the combinational logic between Flip Flops, the necessities to scan the stimuli to the inputs of the combinationa logic is required; however since the utility of scan-chain methods is to reduce the number of pins of the chip; therefore the serial method is always taken so that the scan clock should be utilized to transfer the serial stimuli into the parallel ones. Even if not, in order to test the large number of cones between the Flip flops, we can only test one of the cones at a time so that a scan clock is needed. Currently, there are two ways to test the function of the combinational logics: internal testing logic such as BSIT and external devices such as ATE which often is expensive and less tesing pins than the pins on the chip.

linking scan chains with separate clocks

basic scan sequence:
1) Apply data to primary input (PI)
2) Shifting in scan vector into scan chains through scan in (SI) pins.
3) Scan capture. In this state, scan enable pin is set to low.
4) Shifting out - measure primary output (PO) and Scan out (SO) pins

capture in scan chain

Hi,
Can any body provide some link for scan chain tutorial?

Thanks,
Jitendra

scan chain book

In fact, we apply a clock pulse in test mode called capture cycle

scan capture clock

jitendra said:

Hi,
Can any body provide some link for scan chain tutorial?

Thanks,
Jitendra

Click to expand...

search for the book Digital.Logic.Testing.And.Simulation in ebooks upload/download section of this forum

scan chain primer

in order to capture test data !!!

scan chain example

akrlot : thank you very much for as follows:
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let's study together !!! best regards!!!

scan chain test tutorial

Hi Jitendra,

you can go through the below pasted link for tutorials.


jitendra wrote:
Hi,
Can any body provide some link for scan chain tutorial?

Thanks,
Jitendra


https://www.pearson.ch/HigherEducat...esign-For-TestForDigital.aspx?artikel=84827PH
all the best

apr scan chain

apply a clock puls is to capture internal generated signal into shift register.

akrlot said:

hi;
im wondering why we need to apply a clock pulse in fonctionnal mode?
could u give a good explanation for the scan sequence.
thanx

Click to expand...