New Contributor
New ContributorIf phase_shift0 is changed to 0 ps there a phase shift present
Also if phase_shift0 is changed to 12500 ps the resulting shift is not 180 degrees.
.phase_shift0("3125 ps"),
.phase_shift1("3125 ps"),
.phase_shift2("6250 ps"),
.phase_shift3("9375 ps"),
.phase_shift4("21500 ps"), // 309.6 degrees
.phase_shift5("0 ps"),
.phase_shift6("0 ps"),
.phase_shift7("0 ps"),
.phase_shift8("0 ps"),
New ContributorAdding modelsim capture with the following PLL settings
.phase_shift0("0 ps"),
.phase_shift1("3125 ps"),
.phase_shift2("6250 ps"),
.phase_shift3("9375 ps"),
.phase_shift4("12500 ps"),
.phase_shift5("0 ps"),
.phase_shift6("0 ps"),
.phase_shift7("0 ps"),
.phase_shift8("0 ps"),
Notice outclk_0 and outclk_4 phase shift is not as expected
New ContributorEng Wei,
Curious if there have been any developments... Have you been able to re-produce the issue?
Let me know if you have any questions.
Thanks, Gary
Frequent ContributorHi Gary
I am seeing it in my simulation as well. I am getting engineering help to check if the usage is correct or if the Modelsim setup is correct. I will keep you posted for any update.
Thanks.
Eng Wei
Frequent ContributorHi Gary
Just found this piece of information from the link below, where Intel Arria® 10 and Intel Cyclone® 10 GX devices might have simulation issue with IOPLL phase shift:
For those affected devices, it is recommended to perform hardware verification when checking phase shifts of output clocks of the IOPLL.
Thanks.
Eng Wei
