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Altera_Forum
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13 years ago

TimeQuest & source-synchronous center-aligned input

Hi, I need to constrain a source-synchronous center-aligned input and I've been reading some Altera documentation, as well as Rysc's guide. However I am still not sure if I am doing the right t...
Altera_Forum's avatar
Altera_Forum
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13 years ago

Hi,

that would be the specification of a MII PHY from the FPGA point of view (as taken from PHY's datasheet - that' the incoming clock/data alignment).

180° makes sense, I don't remember exactly why I used 90°.... I guess because most of the Altera AN use 90° shift with PLLs...