Question

I am working in 8 bit pixel values..for ease of coding i want to use conv_integer to convert this 8 bit std_logic_vector.is it cause any synthesise problem?is it reduce the speed of hardware…

Answer 1

No, integers synthesise just fine. Don’t use conv_integer though – that’s from an old non-standard library.

You want to use ieee.numeric_std; and then to_integer(unsigned(some_vector));

If you still want to access the bits, and treat the vector as a number, then use the signed or unsigned type – they define vectors of bits (which can still have -, Z etc.) which behave as numbers, so you can write unsigned_vector <= unsigned_vector + 1.