std_logic_vector makes it easy to compare and assign whole buses, which dramatically simplifies the work necessary to specify combinational logic.
For example, if
value is a 4-bit bus, we could compare it with a constant:
value = "1101"
output is an 8-bit bus, we could set all the bits at once with
output <= "0001111"
Note the use of double-quotes for bit-vector constants. A single bit uses single quotes, multiple bits use multiple quotes.
Complete the architecture below to display the value of S using the digits 0 and 1 on a 7-segment display. The output should be a vector of bits corresponding to the LED segments, in the order "abcdefg". Put the 1 on the right side of the display (using segments b and c).
Are you confident about this change? (select one to recompile)