139 lines
3.6 KiB
Python
Executable File
139 lines
3.6 KiB
Python
Executable File
#! /usr/bin/env python
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# See LICENSE.SiFive for license details.
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from __future__ import division
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from __future__ import print_function
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from __future__ import unicode_literals
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import doctest
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import sys
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import warnings
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from collections import namedtuple
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verilog_template = """
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module {name}(
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input clock,
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input oe,
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input me,
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input [{address_bits_minus_1}:0] address,
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output [{output_width_minus_1}:0] q
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);
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reg [{output_width_minus_1}:0] out;
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reg [{output_width_minus_1}:0] rom [0:{depth_minus_1}];
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// 1024 is the maximum length of $readmemh filename supported by Cadence Incisive
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reg [1024 * 8 - 1:0] path;
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integer i;
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initial begin
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`ifdef RANDOMIZE
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`ifdef RANDOMIZE_MEM_INIT
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for (i = 0; i < {depth}; i++) begin
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rom[i] = {{{num_random_blocks}{{$random}}}};
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end
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`endif
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`endif
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if (!$value$plusargs("maskromhex=%s", path)) begin
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path = "{rom_hex_file}";
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end
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$readmemh(path, rom);
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end
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always @(posedge clock) begin
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if (me) begin
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out <= rom[address];
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end
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end
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assign q = oe ? out : {output_width}'bZ;
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endmodule
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"""
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def gen_rom(name, width, depth, rom_hex_file):
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variables = {
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'name': name,
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'address_bits_minus_1': (depth - 1).bit_length() - 1,
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'depth': depth,
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'depth_minus_1': depth - 1,
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'output_width': width,
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'output_width_minus_1': width - 1,
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# $random in verilog returns 32 bits; compute how many times to repeat
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# $random in order to fill the width
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'num_random_blocks': (width - 1) // 32 + 1,
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'rom_hex_file': rom_hex_file,
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}
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return verilog_template.format(**variables)
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def iterate_by_n(it, n):
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"""Iterate over items in it, yielding n-tuples of successive items.
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>>> list(iterate_by_n([1, 2, 3, 4, 5, 6], n=2))
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[(1, 2), (3, 4), (5, 6)]
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>>> list(iterate_by_n([1, 2, 3, 4, 5, 6], n=3))
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[(1, 2, 3), (4, 5, 6)]
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>>> list(iterate_by_n([1, 2, 3, 4, 5, 6], n=4))
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Traceback (most recent call last):
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...
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ValueError: Iterable length not evenly divisible by 4
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"""
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it = iter(it)
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while True:
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batch = ()
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for i in range(n):
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try:
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batch += (next(it),)
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except StopIteration:
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if batch: # If this is not the first iteration
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raise ValueError(
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'Iterable length not evenly divisible by {}'.format(n)
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)
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else:
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raise
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yield batch
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def try_cast_int(x):
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try:
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return int(x)
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except ValueError:
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return x
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ROMParameters = namedtuple('ROMParameters', ['name', 'depth', 'width'])
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default_rom_parameters = ROMParameters(name='', depth=0, width=0)
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def parse_line(line):
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kwargs = {key: try_cast_int(val)
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for key, val in iterate_by_n(line.split(), 2)}
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rom_parameters = default_rom_parameters._replace(**kwargs)
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return rom_parameters._asdict()
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def main():
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if '--run-tests' in sys.argv:
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(failures, total) = doctest.testmod(verbose=True)
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sys.exit(1 if failures else 0)
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if len(sys.argv) < 2:
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sys.exit('Please give a .conf file as input')
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print('// This file created by ' + __file__)
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with open(sys.argv[1]) as fp:
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lines = fp.readlines()
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if len(lines) > 1:
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warnings.warn('vlsi_rom_gen detected multiple ROMs. ROM contents will be duplicated.')
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for line in lines:
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verilog = gen_rom(rom_hex_file=sys.argv[2],
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**parse_line(line))
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print(verilog)
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if __name__ == '__main__':
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main()
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