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Altera_Forum
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8 years ago

Buffer chain output from DLL in ALTDLL

Hi, I require clocks with different phase shifts. Theoretically, the outputs at each stage of the buffers in the buffer chain of DLL in ALTDLL megafunction should do it. However, ALTDLL outputs only ...
Altera_Forum's avatar
Altera_Forum
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8 years ago

Thanks for the answer! The suggested method will work, except for one problem: the inverters will add a finite delay in addition to providing 180 phase shift to 0/45/90/135 clocks. This delay might be a problem for the required high-speed application.

Just for clarification, to implement 45/90/135 phase delays, I would need to drive three different DLL's using PLL output, right?

The device I'm using is Stratix IV board, with Quartus prime standard edition software.