Re: Assignment #3

Ed Casas (edc@ece.ubc.ca) Fri, 10 Nov 2000 08:20:25 -0800 

Date: Fri, 10 Nov 2000 08:20:25 -0800
From: Ed Casas <edc@ece.ubc.ca>
Subject: Re: Assignment #3



> When compiling the top-level entity file, there are error
> messages on the line: 

>    signal a_in, a_out: std_logic_vector(data_word); 

Use just "data_word" as the type.

> While "data_word" is of type unsigned, as declared in the
> datatype package.  The error messages are: "Subtype indication
> error: subtype indication base type 'UNSIGNED' must match
> constraining base type 'INTEGER'" and "Type error: range must
> be of a discrete type".  What doese these messages mean?  I
> have never use integer type in my codes.

This message means the type of the "constraining" expression (the
array index bounds) must be of type integer.  You've used a type
("data_word") instead of an integer expression.

-- 
Ed Casas   edc@ece.ubc.ca   http://casas.ece.ubc.ca   +1 604 822-2592