N-Bit Adder Subassembly

ctest4.rb

Unit Conversion

#
# This tests the adder simulation by building various size adders and running
# them various numbers of times.
#
require "csim"
require "adder"

# Size of the adder.
size = 8
rpt = 20
size = $*[0].to_i if $*.length > 0
rpt = $*[1].to_i if $*.length > 1

NumberOut.shush

# Blueprint for the 10-bit adder.
bp = Adder.new(size)
addr = bp.another

# Hook up two input switch banks, one output, and an overflow led.
na = SwitchBank.new
size.times { na.join(addr) }
nb = SwitchBank.new
size.times { nb.join(addr) }
disp = NumberOut.new("  Sum")
size.times { addr.join(disp) }
addr.join(LED.new("  Oflow"))

#Gate.dump(na)

NumberOut.shush(false)

# Perform 30 addtions of random numbers.  For each, we choose two random
# inputs, and set them into the input switch banks.  The outputs will print,
# being the sum numeric display and the overflow LED.
print "== Performing #{rpt} tests on #{size}-bit adder.  ",
        "Max sum is #{(1<<size)-1} ==\n"
rpt.times do
  # Choose randoms and print them.
  a = rand(1<<size)
  b = rand(1<<size)
  print a, " + ", b, ":\n"

  # Add them, and keep the circuits active to suppress printout until after
  # the whole operation is complete.
  Gate.activate
  na.value = a
  nb.value = b
  Gate.deactivate
end

N-Bit Adder Subassembly

Unit Conversion