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Message
From: Jecel Assumpcao Jr<jecel@m...>
Date: Fri Mar 5 19:58:23 CET 2004
Subject: [usb] Help with Xilinx Webpack
On Friday 05 March 2004 03:54, omarcastz@n... wrote:
> Object ft245_rd of mode OUT can not be read.
This is a basic VHDL error: if you declare an argument as mode OUT then
you can only assign values to it like
ft245_rd <= ....
but never use it in an expression like
x <= ft245_rd ...
And if you declare it as mode IN then you have the opposite
restrictions. It is very tempting to just declare it as INOUT to solve
your problem, but often it is better to create a new signal like
signal ift245_rd : std_logic;
ft245_rd <= ift245_rd;
ift245_rd <= ....
x <= ift245_rd ...
-- Jecel
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