189 lines
6.8 KiB
Python
Executable File
189 lines
6.8 KiB
Python
Executable File
#! /usr/bin/env python
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# See LICENSE.SiFive for license details.
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# See LICENSE.Berkeley for license details.
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import sys
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import math
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use_latches = 0
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def parse_line(line):
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name = ''
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width = 0
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depth = 0
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ports = ''
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mask_gran = 0
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tokens = line.split()
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i = 0
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for i in range(0,len(tokens),2):
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s = tokens[i]
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if s == 'name':
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name = tokens[i+1]
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elif s == 'width':
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width = int(tokens[i+1])
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mask_gran = width # default setting
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elif s == 'depth':
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depth = int(tokens[i+1])
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elif s == 'ports':
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ports = tokens[i+1].split(',')
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elif s == 'mask_gran':
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mask_gran = int(tokens[i+1])
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else:
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sys.exit('%s: unknown argument %s' % (sys.argv[0], a))
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return (name, width, depth, mask_gran, width//mask_gran, ports)
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def gen_mem(name, width, depth, mask_gran, mask_seg, ports):
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addr_width = max(math.ceil(math.log(depth)/math.log(2)),1)
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port_spec = []
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readports = []
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writeports = []
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latchports = []
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rwports = []
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decl = []
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combinational = []
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sequential = []
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maskedports = {}
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for pid in range(len(ports)):
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ptype = ports[pid]
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if ptype[0:1] == 'm':
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ptype = ptype[1:]
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maskedports[pid] = pid
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if ptype == 'read':
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prefix = 'R%d_' % len(readports)
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port_spec.append('input %sclk' % prefix)
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port_spec.append('input [%d:0] %saddr' % (addr_width-1, prefix))
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port_spec.append('input %sen' % prefix)
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port_spec.append('output [%d:0] %sdata' % (width-1, prefix))
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readports.append(pid)
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elif ptype == 'write':
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prefix = 'W%d_' % len(writeports)
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port_spec.append('input %sclk' % prefix)
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port_spec.append('input [%d:0] %saddr' % (addr_width-1, prefix))
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port_spec.append('input %sen' % prefix)
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port_spec.append('input [%d:0] %sdata' % (width-1, prefix))
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if pid in maskedports:
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port_spec.append('input [%d:0] %smask' % (mask_seg-1, prefix))
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if not use_latches or pid in maskedports:
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writeports.append(pid)
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else:
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latchports.append(pid)
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elif ptype == 'rw':
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prefix = 'RW%d_' % len(rwports)
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port_spec.append('input %sclk' % prefix)
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port_spec.append('input [%d:0] %saddr' % (addr_width-1, prefix))
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port_spec.append('input %sen' % prefix)
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port_spec.append('input %swmode' % prefix)
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if pid in maskedports:
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port_spec.append('input [%d:0] %swmask' % (mask_seg-1, prefix))
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port_spec.append('input [%d:0] %swdata' % (width-1, prefix))
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port_spec.append('output [%d:0] %srdata' % (width-1, prefix))
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rwports.append(pid)
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else:
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sys.exit('%s: unknown port type %s' % (sys.argv[0], ptype))
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nr = len(readports)
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nw = len(writeports)
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nrw = len(rwports)
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masked = len(maskedports)>0
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tup = (depth, width, nr, nw, nrw, masked)
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def emit_read(idx, rw):
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prefix = ('RW%d_' if rw else 'R%d_') % idx
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data = ('%srdata' if rw else '%sdata') % prefix
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en = ('%sen && !%swmode' % (prefix, prefix)) if rw else ('%sen' % prefix)
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decl.append('reg reg_%sren;' % prefix)
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decl.append('reg [%d:0] reg_%saddr;' % (addr_width-1, prefix))
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sequential.append('always @(posedge %sclk)' % prefix)
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sequential.append(' reg_%sren <= %s;' % (prefix, en))
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sequential.append('always @(posedge %sclk)' % prefix)
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sequential.append(' if (%s) reg_%saddr <= %saddr;' % (en, prefix, prefix))
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combinational.append('`ifdef RANDOMIZE_GARBAGE_ASSIGN')
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combinational.append('reg [%d:0] %srandom;' % (((width-1)//32+1)*32-1, prefix))
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combinational.append('always @(posedge %sclk) %srandom <= {%s};' % (prefix, prefix, ', '.join(['$random'] * ((width-1)//32+1))))
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combinational.append('assign %s = reg_%sren ? ram[reg_%saddr] : %srandom[%d:0];' % (data, prefix, prefix, prefix, width-1))
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combinational.append('`else')
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combinational.append('assign %s = ram[reg_%saddr];' % (data, prefix))
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combinational.append('`endif')
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for idx in range(nr):
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emit_read(idx, False)
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for idx in range(nrw):
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emit_read(idx, True)
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for idx in range(len(latchports)):
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prefix = 'W%d_' % idx
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decl.append('reg [%d:0] latch_%saddr;' % (addr_width-1, prefix))
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decl.append('reg [%d:0] latch_%sdata;' % (width-1, prefix))
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decl.append('reg latch_%sen;' % (prefix))
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combinational.append('always @(*) begin')
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combinational.append(' if (!%sclk && %sen) latch_%saddr <= %saddr;' % (prefix, prefix, prefix, prefix))
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combinational.append(' if (!%sclk && %sen) latch_%sdata <= %sdata;' % (prefix, prefix, prefix, prefix))
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combinational.append(' if (!%sclk) latch_%sen <= %sen;' % (prefix, prefix, prefix))
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combinational.append('end')
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combinational.append('always @(*)')
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combinational.append(' if (%sclk && latch_%sen)' % (prefix, prefix))
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combinational.append(' ram[latch_%saddr] <= latch_%sdata;' % (prefix, prefix))
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decl.append('reg [%d:0] ram [%d:0];' % (width-1, depth-1))
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decl.append('`ifdef RANDOMIZE_MEM_INIT')
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decl.append(' integer initvar;')
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decl.append(' initial begin')
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decl.append(' #0.002 begin end')
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decl.append(' for (initvar = 0; initvar < %d; initvar = initvar+1)' % depth)
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decl.append(' ram[initvar] = {%d {$random}};' % ((width-1)//32+1))
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for idx in range(nr):
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prefix = 'R%d_' % idx
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decl.append(' reg_%saddr = {%d {$random}};' % (prefix, ((addr_width-1)//32+1)))
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for idx in range(nrw):
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prefix = 'RW%d_' % idx
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decl.append(' reg_%saddr = {%d {$random}};' % (prefix, ((addr_width-1)//32+1)))
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decl.append(' end')
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decl.append('`endif')
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decl.append("integer i;")
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for idx in range(nw):
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prefix = 'W%d_' % idx
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pid = writeports[idx]
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sequential.append('always @(posedge %sclk)' % prefix)
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sequential.append(" if (%sen) begin" % prefix)
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for i in range(mask_seg):
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mask = ('if (%smask[%d]) ' % (prefix, i)) if pid in maskedports else ''
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ram_range = '%d:%d' % ((i+1)*mask_gran-1, i*mask_gran)
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sequential.append(" %sram[%saddr][%s] <= %sdata[%s];" % (mask, prefix, ram_range, prefix, ram_range))
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sequential.append(" end")
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for idx in range(nrw):
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pid = rwports[idx]
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prefix = 'RW%d_' % idx
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sequential.append('always @(posedge %sclk)' % prefix)
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sequential.append(" if (%sen && %swmode) begin" % (prefix, prefix))
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for i in range(mask_seg):
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mask = ('if (%swmask[%d]) ' % (prefix, i)) if pid in maskedports else ''
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ram_range = '%d:%d' % ((i+1)*mask_gran-1, i*mask_gran)
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sequential.append(" %sram[%saddr][%s] <= %swdata[%s];" % (mask, prefix, ram_range, prefix, ram_range))
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sequential.append(" end")
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body = "\
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%s\n\
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%s\n\
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%s\n" % ('\n '.join(decl), '\n '.join(sequential), '\n '.join(combinational))
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s = "\nmodule %s(\n\
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%s\n\
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);\n\
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\n\
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%s\
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\n\
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endmodule" % (name, ',\n '.join(port_spec), body)
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return s
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def main():
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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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for line in open(sys.argv[1]):
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print(gen_mem(*parse_line(line)))
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if __name__ == '__main__':
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main()
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