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import random
class Register:
def __init__(self, bits: int):
self.bits = bits
self.value = random.randrange(0, 2 ** bits)
def set_value(self, value: int):
if value < 0 or value >= 2 ** self.bits:
raise ValueError(f"Value {value} is out of range for {self.bits}-bit register")
self.value = value
class Counter:
def __init__(self, bits: int):
self.bits = bits
self.value = random.randrange(0, 2 ** bits)
def step(self):
self.value = (self.value + 1) % (2 ** self.bits)
def reset(self):
self.value = 0
class ROM:
def __init__(self, addr_bits: int, data_bits: int):
self.addr_bits = addr_bits
self.data_bits = data_bits
self.memory = [random.randrange(0, 2 ** data_bits) for _ in range(2 ** addr_bits)]
def read(self, addr: int) -> int:
if addr < 0 or addr >= 2 ** self.addr_bits:
raise ValueError(f"Address {addr} is out of range for {self.addr_bits}-bit ROM")
return self.memory[addr]
class RAM:
def __init__(self, addr_bits: int, data_bits: int):
self.addr_bits = addr_bits
self.data_bits = data_bits
self.memory = [random.randrange(0, 2 ** data_bits) for _ in range(2 ** addr_bits)]
def read(self, addr: int) -> int:
if addr < 0 or addr >= 2 ** self.addr_bits:
raise ValueError(f"Address {addr} is out of range for {self.addr_bits}-bit RAM")
return self.memory[addr]
def write(self, addr: int, value: int):
if addr < 0 or addr >= 2 ** self.addr_bits:
raise ValueError(f"Address {addr} is out of range for {self.addr_bits}-bit RAM")
if value < 0 or value >= 2 ** self.data_bits:
raise ValueError(f"Value {value} is out of range for {self.data_bits}-bit RAM")
self.memory[addr] = value
class Interrupts:
def __init__(self, n: int):
self.n = n
self.interrupt_lines = [False] * n
def set_interrupt(self, i: int):
if i < 0 or i >= self.n:
raise ValueError(f"Interrupt {i} is out of range for {self.n}-interrupt system")
self.interrupt_lines[i] = True
def clear_interrupt(self, i: int):
if i < 0 or i >= self.n:
raise ValueError(f"Interrupt {i} is out of range for {self.n}-interrupt system")
self.interrupt_lines[i] = False
def get_priority_interrupt(self) -> int | None:
for i in range(self.n):
if self.interrupt_lines[i]:
return i
return None
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