DFT ; ATPG : with no sdf simulation

[rahul_neil1]

Hi, I am simulating the pattern generated by tetramax in ncverilog. I have used no timing check off. This is just a basic scan chain shift test. My chain is failing right from the start ...with the below message :

Netlist : {dc generated}

>> Error during scan pattern 1 (detected from unload of pattern 0)
>>> At T=637315.00 ns, V=6374, exp=0, got=1, chain chain13, pin out1, scan cell 0

What can be the cause.. I am seeing that the SI is also 1...its very difficult to trace back ..

Can it happen becoz of zero simulation ....

Option used :
+nclicq +delay_mode_unit +nospecify +notiming_check +access+rwc +nctimescale+1ns/10ps +noassert +define+ATPG+DUMP

 

[dftrtl]

No it cannot be because of zero delay

 

[rahul_neil1]

No it cannot be because of zero delay

Thanks for replying...But how can I go about debugging it.