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Hello Dears：
I found i can use LCELL primitive in my project, but i can't use CARRY&CARRY_SUM primitive. My current QII version is 11.1+sp2. I remember i could use them in the old version.
Also i found some words from the user guide as below:
"■The cout port of the CARRY_SUM primitive can feed one or two
cones of logic. If the CARRY_SUM primitive feeds two cones of logic,
one and only one of the cones of logic must be buffered by another
CARRY_SUM primitive. In this case, both cones of logic are
implemented in the same logic cell. You must follow this rule to tie
down the sum and carry-out functions for the first stage of an adder
or counter.
■ A cone of logic that feeds the cin port of a CARRY_SUM primitive can
have up to two inputs. A third input is allowed only if it is a
CARRY_SUM input or a q feedback from the register.
■ The cout port of the CARRY_SUM primitive cannot feed an output
pin.
■ The cin port of the CARRY_SUM primitive cannot be fed by an input
pin.
■ The cout port of two different CARRY_SUM primitives cannot feed
the same gate."
I design my project follow above items exactly! I archived my project and attching here, anyone pls help to check it, thank you very much!!!
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It seems the primitive is optimized away, from attched JEP file! The sin is connected directly to sout!!!!
Honored Contributor
