Dear All, Is it possible in AMS Designer to stop simulation , then change reltol, vabstol and other tolerance values and then restart the simulation? I prefer to use irun based OSS netlister and executables and from command line. I have the following versions in my Cadence Setup. ICFB : 5.10.41.500.6.141 Spectre Version: 7.2.0.194.isr4 NCSIM version: 08.20-s022: And also please suggest how to integrate Matlab/Simulank command thorugh irun (if possible). Thanks in advance. Thanks and Regards !!!! Cheers !!! Debjit.