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Altera_Forum's avatar
Altera_Forum
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13 years ago

arrays

Hello, 1) How do I initialize an array? When I used the following: ARCHITECTURE test OF Testing IS TYPE arr IS ARRAY (N DOWNTO 0) OF STD_LOGIC_VECTOR (N DOWNTO 0); SIGNAL rr :arr := (...
Altera_Forum's avatar
Altera_Forum
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13 years ago

Unconstrained 2d arrays are part of the VHDL 2008 spec, and modelsim 10+ should handle them fine. VHDL 2008 also allows you to declare types, functions, procedures etc in the generic region, but I doubt Quartus will bother supporting this any time soon. So you will need a package (which is usually the most sensible thing anyway). Any reason you dont want a package?

I would personally avoid std_logic_2d type because of what josyb has said - it can cause a lot of hassle and you need conversion functions to break your arrays out of there.