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VHDL Loop Statement error at <location>: WHILE iteration scheme condition cannot contain signals


CAUSE: In a Loop Statement at the specified location in a VHDL Design File (.vhd), you used a WHILE iteration scheme condition that contains one or more signals. However, the condition must be an expression of integer variables that contains no signals.
ACTION: Remove any signals from the WHILE iteration scheme condition.

See also:

Section 8.9 of the IEEE Std 1076-1993 IEEE Standard VHDL Language Reference Manual

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