Missing direction on entity port

[jtw]

As a result of changing what was a generic to an input port, I omitted the
keyword 'in'. Neither the simulator (Modelsim 6.x) nor the synthesis tool
(Synplicity 8.4) challenged me on this. Is there a specified default? Or
is this a tool thing? (In case it isn't obvious, both the simulation and the
synthesis turned out okay.)

Jason

 

[Paul Uiterlinden]

As a result of changing what was a generic to an input port, I
omitted the
keyword 'in'. Neither the simulator (Modelsim 6.x) nor the
synthesis tool
(Synplicity 8.4) challenged me on this. Is there a specified
default? Or is this a tool thing? (In case it isn't obvious, both
the simulation and the synthesis turned out okay.)

The mode is optional with IN as default. The same goes for the formal
parameters in the parameter list declaration of subprograms
(procedures and functions). So it is perfectly OK that the simulator
and synthesizer do not complain.