I know that this is a 4:1 MUX, but what does the little line across the w1 w2 selection line mean?

You know, the little black line that has a "2" next to it.

Has it something to do with "array" or something?

enter image description here

  • \$\begingroup\$ You can also think about it as 2^n and you have 4 input lines. n must be 2. \$\endgroup\$ Commented Oct 24, 2019 at 15:49

1 Answer 1


This notation means a bus line with the width noted by the number written next to it. In your case it is 2-bit wide bus. It is used to make the drawing less convoluted by reducing lines drawn.

  • \$\begingroup\$ Okay, so instead of drawing a selection for both w1 and w2, you can just draw a bus line like this, and indicate how many lines it represents? \$\endgroup\$
    – Carl
    Commented Oct 24, 2019 at 14:32
  • 1
    \$\begingroup\$ Yes, this is what it does. \$\endgroup\$
    – Eugene Sh.
    Commented Oct 24, 2019 at 14:32

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