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Vhdl Unconstrained Array


share|improve this answer edited Jun 19 '14 at 5:09 answered Jun 19 '14 at 4:56 Morten Zilmer 10.7k2930 add a comment| Your Answer draft saved draft discarded Sign up or I'm sure this would be a common scenario. These are useful for memories, vector tables, etc.: type NIBBLE is array (3 downto 0) of std_ulogic; type MEM is array (0 to 7) of NIBBLE; -- an array "array of Thank u Reply With Quote October 27th, 2014,12:04 AM #9 Tricky View Profile View Forum Posts Moderator **Forum Master** Join Date Oct 2008 Posts 5,133 Rep Power 1 Re: Vhdl 2008

So how would I declare the > signal so as to associate the desired inner array size? > Hi Alex, VHDL doesn't allow the element type of an array to be or, even better ... Is it acceptable to ask an unknown professor for help in a related field during his office hours? E.g.

Vhdl Unconstrained Array

type Array2D is array (natural range <>, natural range<>) of element_type; signal actual_matrix : Array2D(size1 -1 downto 0, size2-1 downto 0); Note: element_type still has to be constrained. Could I work as a Professor in Europe if I only speak English? Why, if they would allow the definition of an unconstrained array, would they not allow the elements of the array to be similarly unconstrained, especially given that you can have the The Synplify help file implies that it does know about records with unconstrained arrays and type generics. –Martin Thompson Oct 28 '11 at 11:40 yes indeed, that's a bit

Not the answer you're looking for? Instead of carrying large number of IO through hierarchy, I can use hierarchical signals to port them to the top level for board level debugging? type NIBBLE is array (3 downto 0) of std_ulogic; type RAM is array (0 to 31) of integer range 0 to 255; signal A_BUS : NIBBLE; signal RAM_0 : RAM; An By automating the tedious, repetitive, low-intelligence-required tasks, EDA is supposed to free up the time of expensive, highly skilled engineers and make them more productive.

It has the VHDL 93 version of the fixed point libraries, but thats about it. Signal Cannot Be Unconstrained Vhdl When an array object is declared, an existing array type must be used. Solutions? http://www.alteraforum.com/forum/showthread.php?t=26408&page=2 You cannot declare an array type with an unconstrained element type.

So I declare the component. > But now, once in this design, my bit-width and number of busses is fixed. > Let's say my word size is 32 and I have Sign Up Now! Is there an elegant way to achieve that kind of "generic passing" that is synthesizable? The nth numerator Word for "using technology inappropriately"?

Signal Cannot Be Unconstrained Vhdl

Is it safe to use cheap USB data cables? String, bit_vector and std_logic_vector are defined in this way. Vhdl Unconstrained Array So how would I declare the signal so as to associate the desired inner array size? Home Forum New Posts FAQ Calendar Community Groups Forum Actions Mark Forums Read Quick Links Today's Posts View Site Leaders Forum Rules Marketplace Shared Material FAQ About Us Register Chinese Forum

Bit width of the bus is probably a good choice. Ace, SuitType) of Boolean; north, south, east, west: CardSetType; ... Is "she don't" sometimes considered correct form? What now?

I thought you had to use the new conditional operator to convert std_logic to a boolean: if ?? Player claims their wizard character knows everything (from books). This compiles fine in Aldec HDL where VHDL 2008 is checked as the language version. Why are password boxes always blanked out when other sensitive data isn't?

Is it possible to bleed brakes without using floor jack? With unconstrained array types that function can be generic. Teenage daughter refusing to go to school Was there no tax before 1913 in the United States?

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So, it would seem to me natural to define a type : std_logic_tensor as an array of std_logic_vector. Thanks, T –user1017739 Oct 28 '11 at 9:34 That's a shame (about Quartus), but not entirely unexpected. Reply With Quote December 13th, 2010,04:47 AM #5 chipslinger View Profile View Forum Posts Altera Scholar Join Date Sep 2009 Posts 41 Rep Power 1 Re: Vhdl 2008 On a similar It seems to me that VHDL is pretty broken when dealing with multiple, heterogeneous busses of arbitrary bit-width.

Thank u I can confirm this. I am trying to find out if Quartus needs the ?? See also: Sections 3.2.1 and 4.1 of the IEEE Std 1076-1993 IEEE Standard VHDL Language Reference Manual Log in or Sign up Coding Forums Forums > Archive > Archive > VHDL Although it breaks the idea of what I'm trying to achieve, I tried making the fixed-width port declarations in the entity declaration, and the compiler still complained, in the same way.

Create the maximum number you expect for a system and then don't connect the ones you don't need. Member Login Remember Me Forgot your password?