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<
Forty-Bot>
how do the multiple outputs for SB_PLL40_2F_CORE work?
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<
Forty-Bot>
or does each port have duplicated hardware for the phase shifter and fine delay adjustment port?
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<
agg>
you get PLLOUTGLOBALA, PLLOUTCOREA, PLLOUTGLOBALB, PLLOUTCOREB
<
agg>
there's only one fine delay adjust aiui, but you can choose 0/90 phase shift or half-freq for the second port
<
agg>
you get PLLOUT_SELECT_PORT{A,B} each of which can be SHIFTREG_0deg, SHIFTREG_90deg, GENCLK, or GENCLK_HALF
<
Forty-Bot>
ok, so if I change the fine delay adjust then only (e.g.) port A gets adjusted?
<
agg>
FDA_RELATIVE delays output A relative to output B, for finer phase between them
<
agg>
I've not tried FDA with two outputs though, have only used two outputs to get a half-freq or a 90' phase
<
agg>
this is all in the SBTICETechnologyLibrary201701.pdf
<
agg>
it doesn't have a diagram, which would have been helpful, but the explanation of what the parameters do is updated for the 2F PLLs
<
Forty-Bot>
yeah, I saw that which is what I was confused
<
Forty-Bot>
since the diagrams in the pll design guide only show one port
<
agg>
the pll design guide has only the most passing reference to the idea it can output two frequencies, lol
<
agg>
it says "If a two-port
<
agg>
PLL is used, this additional delay is applied only on Port A.
<
agg>
and nowhere else mentions the concept of a two-port PLL or a port B existing, lol
<
Forty-Bot>
it also mentions them in the signals section
<
Forty-Bot>
but doesn't clarify that firther
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