虽然dc也有report_area -hier命令来报告各级模块的面积,本python方案看似有点造轮子,但还是有一定的便利性。一、不受网表类型的限制,综合网表、DFT网表、APR都可以。二、可以过滤面积小于指定值的小模块,比如工具自动插入的ICG模块。三、还可以根据面积占比做排序,方便分析面积的瓶颈。
一、读入网表
下面先读入网表,并分模块识别每个模块内部的stdcell和子模块。这部分与《用python实现分模块按cell类型统计cell个数并降序排列》的方法相同,所以这里直接导入netlistparser.py。
import netlistparser as nlparser import sys vlog_netlist_file = sys.argv[2] modules=nlparser.read_vlog_netlist(vlog_netlist_file)
这样网表就读到了内部python字典里,结构如下:
{ "moduleA": { "module_name": "moduleA", "insts": { "u_AND2_01":"AND2X1", "u_AND2_02": "AND2X1", "u_OR2_01":"OR2X1", "u_INV_01":"INVX1" } }, "moduleB": { "module_name": "moduleB", "insts": { "u_AND2_01": "AND2X1", "u_AND2_02": "AND2X1", "u_OR2_01": "OR2X1", "u_INV_01": "INVX1" } }, }
二、读入lib库
stdcell的面积信息存储在fab提供的lib文件里,所以我们需要从lib里读到每种cell的面积,方法如下:
# libparser.py import sys import re import json def read_library(file_name): cells = {} lib_lines = open(file_name, 'r').readlines() cell_start = 0 pin_start = 0 total_lines = len(lib_lines) print('') for i in range(total_lines): line = lib_lines[i] print('33[1F {}%'.format(round(100 * i / total_lines))) cell_s_m=re.search(r'cells*((w+))s+{',line) area_m=re.search(r'sareas+:s+(S+)s*;',line) pin_s_m = re.search(r'spin((w+))s+{', line) dir_m = re.search(r'sdirections+:s+(w+)', line) func_m = re.search(r'sfunctions+:s+"(.*)"', line) end_m = re.search(r'}', line) if cell_s_m: cell_start = 1 cell = {} cell_name = cell_s_m.group(1) cell['cell_name'] = cell_name pins = [] cell['pins'] = pins cells[cell_name] = cell if cell_start and area_m: area = area_m.group(1) cell['area'] = round(float(area), 4) if cell_start and pin_s_m: pin_start = 1 pin = {} pin_name = pin_s_m.group(1) pin['pin_name'] = pin_name if cell_start and dir_m: pin_dir = dir_m.group(1) pin['pin_dir'] = pin_dir if cell_start and func_m: pin_func = func_m.group(1) pin['pin_func'] = pin_func if cell_start and pin_start and end_m: pin_start = 0 pins.append(pin) return cells def get_cell_area(cells, cell_name): if cell_name in cells: return cells[cell_name]['area'] else: return 0 def is_libcell(cells, cell_name): if cell_name in cells: return True else: return False def write_lib_info(lib_info, file_name): f = open(file_name, 'w') f.write(json.dumps(lib_info, indent=4)) f.close()
其中,read_library()函数实现了用正则读取lib文件里的cell名字、area、pin、pin方向、function等信息。今天只需要用到cell名字和面积。其它信息是为了后续扩展其它功能做准备。
get_cell_area()提供了读取指定cell面积的接口。is_libcell()实现了判断是libcell还是一般的设计上的子模块。
write_lib_info()可以将lib库的字典写到json文件里,方便调试。
接下来,用这个libparser读入lib库:
import libparser import sys lib_file = sys.argv[1] lib_info=libparser.read_library(lib_file)
三、面积递归统计
我们从top design开始,当遇到stdcell中的cell则累加,当遇到子模块则递归。直到子模块不再含有其它子模块(仅由stdcell组成)时,则返回。
area_info = {} def report_area(modules, lib_info, module_name): global area_info area = 0 insts = modules[module_name]['insts'] for inst in insts: cell_inst = inst cell_type = insts[inst] if cell_type in area_info: area = area + area_info[cell_type] elif libparser.is_libcell(lib_info, cell_type): area = area + libparser.get_cell_area(lib_info, cell_type) else: #递归 report_area(modules,lib_info,cell_type) area = area + area_info[cell_type] area_info[module_name]=area
四、打印面积
打印的同时,可以做一些过滤或者排序。
for module in area_info: if not re.search(r'CLOCK_GATE', module): print(module, round(area_info[module], 4))
效果如下:
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python
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原文标题:用python实现网表分模块统计面积
文章出处:【微信号:处芯积律,微信公众号:处芯积律】欢迎添加关注!文章转载请注明出处。
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