def test_inc(self):
"Checks that inc(Multi) increases the value by 1"
self.assertEquals(str(inc(m_16384)), str(m_16385))
self.assertEquals(str(inc(m_zero)), str(one16))
self.assertEquals(str(inc(m_three)), str(four16))
self.assertEquals(str(inc(neg_one)), str(zero16))
self.assertEquals(str(inc(neg_three)), str(neg_two))
def __call__(self, multi, load, increase, reset, clock):
# if load, inc, or reset are set, load should be set for the register
reg_load = load | increase | reset
# if inc = 1, return (value + 1), else return value
if_increase = multimux(self.value, inc(self.value), increase)
# if load = 1, return multi, else return if_increase
if_out = multimux(if_increase, multi, load)
# if reset = 1, return 0, else return if_out
if_reset = multimux(if_out, Multi(zero for i in range(16)), reset)
self.value = self.reg(if_reset, reg_load, clock)
return self.value
def __call__(self, multi, load, increase, reset, clock):
# if load, inc, or reset are set, load should be set for the register
reg_load = load | increase | reset
# if inc = 1, return (value + 1), else return value
if_increase = multimux(self.value, inc(self.value), increase)
# if load = 1, return multi, else return if_increase
if_out = multimux(if_increase, multi, load)
# if reset = 1, return 0, else return if_out
if_reset = multimux(if_out, Multi(zero for i in range(16)), reset)
self.value = self.reg(if_reset, reg_load, clock)
return self.value
def from_num(num):
"Helper function to create a 16-bit Multi instance using a number"
bnum = bin(num)
b = bnum.index('b') + 1
pos = Multi(Bit(digit) for digit in bnum[b:])
pos.insert(0, Bit(0))
pos = pad_to_digits(16, pos)[0]
if bnum[0] == '-':
neg = inc(~pos)
if len(neg) > 16:
return neg[1:]
return Multi(neg)
return Multi(pos)
def test_alu(self):
x = zero16
y = neg_one
self.assertEquals([str(bit) for bit in alu(x, y, one, zero, one, zero, one, zero)], [str(zero16), str(one), str(zero)]) # 0
self.assertEquals([str(bit) for bit in alu(x, y, one, one, one, one, one, one)], [str(one16), str(zero), str(zero)]) # 1
self.assertEquals([str(bit) for bit in alu(x, y, one, one, one, zero, one, zero)], [str(neg_one), str(zero), str(one)]) # -1
self.assertEquals([str(bit) for bit in alu(x, y, zero, zero, one, one, zero, zero)], [str(zero16), str(one), str(zero)]) # x
self.assertEquals([str(bit) for bit in alu(x, y, one, one, zero, zero, zero, zero)], [str(neg_one), str(zero), str(one)]) # y
self.assertEquals([str(bit) for bit in alu(x, y, zero, zero, one, one, zero, one)], [str(neg_one), str(zero), str(one)]) # ~x
self.assertEquals([str(bit) for bit in alu(x, y, one, one, zero, zero, zero, one)], [str(zero16), str(one), str(zero)]) # ~y
self.assertEquals([str(bit) for bit in alu(x, y, zero, zero, one, one, one, one)], [str(zero16), str(one), str(zero)]) # -x
self.assertEquals([str(bit) for bit in alu(x, y, one, one, zero, zero, one, one)], [str(one16), str(zero), str(zero)]) # -y
self.assertEquals([str(bit) for bit in alu(x, y, zero, one, one, one, one, one)], [str(one16), str(zero), str(zero)]) # x + 1
self.assertEquals([str(bit) for bit in alu(x, y, one, one, zero, one, one, one)], [str(zero16), str(one), str(zero)]) # y + 1
self.assertEquals([str(bit) for bit in alu(x, y, zero, zero, one, one, one, zero)], [str(neg_one), str(zero), str(one)]) # x - 1
self.assertEquals([str(bit) for bit in alu(x, y, one, one, zero, zero, one, zero)], [str(neg_two), str(zero), str(one)]) # y - 1
self.assertEquals([str(bit) for bit in alu(x, y, zero, zero, zero, zero, one, zero)], [str(neg_one), str(zero), str(one)]) # x + y
self.assertEquals([str(bit) for bit in alu(x, y, zero, one, zero, zero, one, one)], [str(one16), str(zero), str(zero)]) # x - y
self.assertEquals([str(bit) for bit in alu(x, y, zero, zero, zero, one, one, one)], [str(neg_one), str(zero), str(one)]) # y - x
self.assertEquals([str(bit) for bit in alu(x, y, zero, zero, zero, zero, zero, zero)], [str(zero16), str(one), str(zero)]) # x & y
self.assertEquals([str(bit) for bit in alu(x, y, zero, one, zero, one, zero, one)], [str(neg_one), str(zero), str(one)]) # x | y
x = Multi(from_num(17))
y = three16
self.assertEquals([str(bit) for bit in alu(x, y, one, zero, one, zero, one, zero)], [str(zero16), str(one), str(zero)]) # 0
self.assertEquals([str(bit) for bit in alu(x, y, one, one, one, one, one, one)], [str(one16), str(zero), str(zero)]) # 1
self.assertEquals([str(bit) for bit in alu(x, y, one, one, one, zero, one, zero)], [str(neg_one), str(zero), str(one)]) # -1
self.assertEquals([str(bit) for bit in alu(x, y, zero, zero, one, one, zero, zero)], [str(x), str(zero), str(zero)]) # x
self.assertEquals([str(bit) for bit in alu(x, y, one, one, zero, zero, zero, zero)], [str(y), str(zero), str(zero)]) # y
self.assertEquals([str(bit) for bit in alu(x, y, zero, zero, one, one, zero, one)], [str(~x), str(zero), str(one)]) # ~x
self.assertEquals([str(bit) for bit in alu(x, y, one, one, zero, zero, zero, one)], [str(~y), str(zero), str(one)]) # ~y
self.assertEquals([str(bit) for bit in alu(x, y, zero, zero, one, one, one, one)], [str(from_num(-17)),
str(zero), str(one)]) # -x
self.assertEquals([str(bit) for bit in alu(x, y, one, one, zero, zero, one, one)], [str(neg_three), str(zero), str(one)]) # -y
self.assertEquals([str(bit) for bit in alu(x, y, zero, one, one, one, one, one)], [str(inc(x)), str(zero), str(zero)]) # x + 1
self.assertEquals([str(bit) for bit in alu(x, y, one, one, zero, one, one, one)], [str(inc(y)), str(zero), str(zero)]) # y + 1
self.assertEquals([str(bit) for bit in alu(x, y, zero, zero, one, one, one, zero)], [str(from_num(16)),
str(zero), str(zero)]) # x - 1
self.assertEquals([str(bit) for bit in alu(x, y, one, one, zero, zero, one, zero)], [str(two16), str(zero), str(zero)]) # y - 1
self.assertEquals([str(bit) for bit in alu(x, y, zero, zero, zero, zero, one, zero)], [str(from_num(20)),
str(zero), str(zero)]) # x + y
self.assertEquals([str(bit) for bit in alu(x, y, zero, one, zero, zero, one, one)], [str(from_num(14)),
str(zero), str(zero)]) # x - y
self.assertEquals([str(bit) for bit in alu(x, y, zero, zero, zero, one, one, one)], [str(from_num(-14)),
str(zero), str(one)]) # y - x
self.assertEquals([str(bit) for bit in alu(x, y, zero, zero, zero, zero, zero, zero)], [str(one16), str(zero), str(zero)]) # x & y
self.assertEquals([str(bit) for bit in alu(x, y, zero, one, zero, one, zero, one)], [str(from_num(19)),
str(zero), str(zero)]) # x | y