20071009 HW

1
2007/10/09 HW

• (10) Please complete the hardware of 4-bit full
  adder and subtractor, respectively.
• (20) Please combine these two hardware into one
  and to form the 4-bit adder/subtractor by setting
  the value of cin, if cin0 then perform addition,
  else perform subtraction.
• (20) Please add OVERFLOW detection circuit to
  indicate the result is overflow, except some
  inputs that wont cause overflow, your test data
  must contain the following inputs that will cause
  overflow
• a0001, b0111, cin0
• a1001, b1010, cin0
• a1001, b0111, cin1
• a0111, b1001, cin1

2
2007/10/09 HW (contd)

• (20) Use your designed 4-bit adder/subtractor
  with overflow detection to design an 8-bit
  adder/subtrcotr with overflow detection, your
  report must contain your circuit architecture (by
  drawing), Verilog code, test bench, simulation
  waveform and your descriptions about simulation.
• (30) Write a C program that can generate the
  Verilog file of the adder/subtractor circuits
  automatically once the user inputs the bit-width
  of the adder. For example, if user inputs n8,
  your program can generate the contents (including
  the Verilog file and the corresponding test bench
  for the circuits) for the adder/subtractor
  circuits. You must upload your C file to the ftp
  site by naming the filename as your student
  number, too. (If your program can generate Ripple
  Carry Adder/subtractor 1-bit module by another,
  you will get 10, if your program can generate
  adder/subtractor 4-bit module by 4-bit module
  consectively, your will get 30!)