# 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
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
from pybag.enum import TermType
# noinspection PyPep8Naming
[docs]class bag3_digital__lvshift(Module):
[docs] yaml_file = pkg_resources.resource_filename(__name__,
str(Path('netlist_info',
'lvshift.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(
lev_params='parameters for level shifter',
buf_params='parameters for input buffer.',
dual_output='True to export complementary outputs.',
invert_out='True to export only the inverted output.',
export_pins='Defaults to False; set to True to export pins for simulation.'
)
@classmethod
[docs] def get_default_param_values(cls) -> Dict[str, Any]:
return dict(
dual_output=True,
invert_out=False,
export_pins=False,
)
[docs] def design(self, lev_params: Param, buf_params: Param, dual_output: bool, invert_out: bool, export_pins: bool
) -> None:
core = self.instances['XLEV']
core.design(dual_output=dual_output, invert_out=invert_out, export_pins=export_pins, **lev_params)
self.instances['XBUF'].design(dual_output=True, **buf_params)
core_pins = core.master.pins
if 'outb' not in core_pins:
self.remove_pin('out' if invert_out else 'outb')
if 'rst_casc' not in core_pins:
# no reset
self.remove_pin('rst_out')
self.remove_pin('rst_outb')
self.remove_pin('rst_casc')
if export_pins:
self.add_pin('inb_buf', TermType.output)
self.add_pin('in_buf', TermType.output)
self.add_pin('midp', TermType.output)
self.add_pin('midn', TermType.output)
self.reconnect_instance_terminal('XLEV', 'midn', 'midn')
self.reconnect_instance_terminal('XLEV', 'midp', 'midp')