# SPDX-License-Identifier: Apache-2.0
# Copyright 2019 Blue Cheetah Analog Design Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from typing import Dict, Any, Mapping
import pkg_resources
from pathlib import Path
from bag.design.module import Module
from bag.design.database import ModuleDB
from bag.util.immutable import Param
# noinspection PyPep8Naming
[docs]class bag3_digital__sr_latch_symmetric_core(Module):
"""Module for library bag3_digital cell sr_latch_symmetric_core.
Fill in high level description here.
"""
[docs] yaml_file = pkg_resources.resource_filename(__name__,
str(Path('netlist_info',
'sr_latch_symmetric_core.yaml')))
def __init__(self, database: ModuleDB, params: Param, **kwargs: Any) -> None:
Module.__init__(self, self.yaml_file, database, params, **kwargs)
@classmethod
[docs] def get_params_info(cls) -> Dict[str, str]:
return dict(
lch='channel length.',
seg_dict='number of segments dictionary.',
w_dict='widths dictionary.',
th_dict='threshold dictionary.',
has_rstb='True to add rstb functionality.',
)
@classmethod
[docs] def get_default_param_values(cls) -> Dict[str, Any]:
return dict(has_rstb=False)
[docs] def design(self, lch: int, seg_dict: Mapping[str, int], w_dict: Mapping[str, int],
th_dict: Mapping[str, str], has_rstb: bool) -> None:
name_list = ['nfb', 'pfb', 'ps', 'nr']
if has_rstb:
name_list.append('pr')
else:
self.remove_pin('rstlb')
self.remove_pin('rsthb')
self.remove_instance('XPRP')
self.remove_instance('XPRN')
for name in name_list:
uname = name.upper()
w = w_dict[name]
nf = seg_dict[name]
intent = th_dict[name]
pinst = self.instances[f'X{uname}P']
ninst = self.instances[f'X{uname}N']
if name[1:] == 'fb':
pinst.design(lch=lch, w=w, seg=nf, intent=intent, stack=2)
ninst.design(lch=lch, w=w, seg=nf, intent=intent, stack=2)
else:
pinst.design(l=lch, w=w, nf=nf, intent=intent)
ninst.design(l=lch, w=w, nf=nf, intent=intent)