Ring4.abl MODULE Ring4 TITLE '4-bit Ring Counter A. Shift4.abl (cont’d) EQUATIONS Q.c = PB Q0.d = !Clear & data_in Q1.d = !Clear & Q0 Q2.d = !Clear & Q1 Q3.d = !Clear & Q2 END Shift4 Student, 7/22/02' DECLARATIONS ' INPUT PINS ' PB PIN 10 ' push-button switch (clock) Clear PIN 7 ' Switch 2 Load PIN 11 ' Switch 3 data_in PIN 70 ' Switch 8 ' OUTPUT PINS ' Q3.Q0 PIN 39,37,36,35 ISTYPE 'reg buffer' ' LED 5.8 Q = ' 3-bit output vector Shift4.abl MODULE Shift4 TITLE '4-bit Shift Register A.
