Question

Problem 1. Capture the following system behavior as an HLSM. The system has two single-bit inputs U and D each coming from a button, and a 16-bit output C, which is initially 0. For each press of U, the systenm increments C.For each press of D, the system decrements C. If both buttons are pressed, the system does not change C. The system does not roll over; it goes no higher than the largest C and no lower than C 0. A press is detected as a change from 0 to 1; the duration of that 1 does not matter.

Answer 1

Given data we given the behaviour of the high level state machine is as shown in the figure 1 Inputs: 0 (bit), D (bit) Output: - c (16 bits) total registers: - (Greg (16 bits)) The system can be built using six states as shown in the figure Initially the digits c is loaded with 0 when 0 is pressed then the state goes to press '0' \r\n And the value of register c is incremented when D is pressed then the state goes to press D and the value of the register c is decremented If both the terms are pressed then the state changes to wait state