Description
You may see this error when synthesizing a VHDL
CASE statement in the MAX PLUS II software if
there is no WHEN OTHERS clause in the design.
For example, the following code causes the above error, where input_a and output_b are
declared as STD_LOGIC:
CASE input_a IS
WHEN '0' =>
output_b
output_b
output_b
output_b