Where developers & technologists share private knowledge with coworkersProgramming & related technical career opportunitiesError (10500): VHDL syntax error at HW31911.vhd(24) near text ","; expecting "<="I already have mode : in std.... and also fixed bout : out...with state select state_next <= "0001" when "0000", "0010" when "0001" & (mode = '0'); "0011" when "0010" & (mode = '0'), "0100" when "0011" & (mode = '0'), "0101" when "0100" & (mode = '0'), "0110" when "0101" & (mode = '1'), "0111" when "0110" & (mode = '1'), "1000" when "0111" & (mode = '1'), "1001" when "1000" & (mode = '1'), Stack Overflow works best with JavaScript enabled

Here we will discuss, when select, with select and with select when statement in VHDL language.

But anyhow. your coworkers to find and share information.

Assume we want to output a 4 bit number (swr) to a 7-segment display (seg).

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The selected signal assignment (with swr select ...) is essentially a short-hand notion for creating a process along with the appropriate sensitivity list and case statement.Thanks for contributing an answer to Stack Overflow! When-Else Statement. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under Featured on Meta

Stack Overflow works best with JavaScript enabled The selected signal assignment (with swr select ...) is essentially a short-hand notion for creating a process … By clicking “Post Your Answer”, you agree to our To subscribe to this RSS feed, copy and paste this URL into your RSS reader.

Alternate VHDL Code Using when-else.

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-- what I wanted to do is if input 0000 AND the mode 0 then 0001As you are using two inputs for selecting, you will have to concatenate them before using select. Where developers & technologists share private knowledge with coworkersProgramming & related technical career opportunities

vhdl with select. The difference is one is a sequential statement and must occur inside a process, while the other is a concurrent statement and appears outside of a process. with.. select is not an if-statement. I have a simple 2-4 decoder as followed: library ieee; use ieee.

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A when-else statement allows a signal to be assigned a value based on set of conditions. Please help us improve Stack Overflow.

In VHDL-93, any signal assigment statement may have an optinal label. Thus:Thanks for contributing an answer to Stack Overflow! For example, the VHDL code describing the multiplexer of Figure 3 will be. (one faster than the other?, or uses more logic gates?

The symbol ; ends a statement. This code implements exactly the same multiplexer as the previous VHDL code, but uses the VHDL when-else construct. I'm learning VHDL using Altera Max V and Quartus to do some examples and I have a trouble when using "With Select when" statement.

Stack Overflow for Teams is a private, secure spot for you and As you are using two inputs for selecting, you will have to concatenate them before using select. or ...)They'll produce substantially the same logic (or at least if they don't I'd file a bug :)As far as the simulator goes they should have the same effect too - the second form creates an implicit process sensitive to The difference is one is a sequential statement and must occur inside a process, while the other is a concurrent statement and appears outside of a process.

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VHDL Programming When-Else statement/ with-select- when statement. I wrote a code and i got a problem defining the if statement-- here is my problem First of all, let’s talk about when-else statement. In the first approach I use the case statement:Or I could use the "with select" statement (this time not within a process):Can you please tell me what are the differences between these two approaches? with control_expression select output_signal <= value_1 when option_1, value_2 when option_2, ... value_n when option_n; How are we doing? It is in the wrong place. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under

The selected signal assignment allows us to implement the functionality of a multiplexer.

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