litedram/test/gen_access_pattern.py

#!/usr/bin/env python3

import random
import argparse

def main():
    description = """
    Generate random access pattern for LiteDRAM Pattern Generator/Checker.

    Each address in range [base, base+length) will be accessed only once, but in random order.
    This ensures that no data will be overwritten.
    """
    parser = argparse.ArgumentParser(description=description)
    parser.add_argument("base",       help="Base address")
    parser.add_argument("length",     help="Number of (address, data) pairs")
    parser.add_argument("data_width", help="Width of data (used to determine max value)")
    parser.add_argument("--seed",     help="Use given random seed (int)")
    args = parser.parse_args()

    if args.seed:
        random.seed(int(args.seed, 0))

    base       = int(args.base, 0)
    length     = int(args.length, 0)
    data_width = int(args.data_width, 0)

    address = list(range(length))
    random.shuffle(address)
    data = [random.randrange(0, 2**data_width) for _ in range(length)]

    for a, d in zip(address, data):
        print("0x{:08x}, 0x{:08x}".format(a, d))

if __name__ == "__main__":
    main()