How to shift left 4bit signal without making register

Hi,

Got a favourite language? In VHDL you could do something like:

b <= b(2 downto 0) & '0';

assuming b is defined as a four bit std_logic_vector.

Mark.

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you could do that, but it wont work without registers. Its called a shift register for a reason...

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Well, yeah, the behaviour of that line of code is entirely dependent on what's around it. On it's own it doesn't hold a value or anything. The OP's question was a little vague...

Mark.