litedram/test/gen_access_pattern.py

#!/usr/bin/env python

import random
import argparse

def main():
    desc = """
    Generate random access pattern.
    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=desc)
    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()