ABEL Program for Rotate

MODULE Rotate

INTERFACE (A3..A0, S1, S0 -> B3..B0);

TITLE ’4 bit rotate'

"Inputs

A3..A0 PIN; " data inputs

S1, S0 PIN; " Rotate amount

"Outputs

B3..B0 PIN; " data outputs

"Aliases

A = [A3..A0];

B = [B3..B0];

S = [S1,S0];

EQUATIONS

WHEN (S == 0) THEN B = A

ELSE WHEN (S == 1) THEN B = [A2..A0, A3]

ELSE WHEN (S == 2) THEN B = [A1,A0,A3,A2]

ELSE WHEN (S == 3) THEN B = [A0, A3..A1];

END

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