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Hello ingdxdy,
The Cyclone V serial devcies carry chain should be like this, as attached picture shows. One ALM include two LEs, however, timequest display that one of LE can't privide any delay time.
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Your testing result seems fit arria ii devices. And I run same test on StratixIV device, the delay time is about 14 ps.
I doubt Cyclone V has same die as arria II. For i know that Arria GX has same die as Stratix IIGX.
BTW, I have a question about you TDC implemented inside Cyclone V. The delay time is so tiny (not like 45 ps, as you said in CIV), it means that you have to implement longer delay chain, this would give you many problems for logic design. Speak frankly, I try to implement TDC inside Cyclone V and StratixIV, and i found the delay line was not stable. So i gave up.
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