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OpenTimer时序分析.md

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OpenTimer：静态时序分析工具

使用简介

示例

# 编译安装
git clone https://github.com/OpenTimer/OpenTimer.git
cd OpenTimer
mkdir build
cd build
cmake ../
make

# 安装结果测试
make test

# 使用
../bin/ot-shell
cd example/simple
read_celllib osu018_stdcells.lib
read_verilog simple.v
read_sdc simple.sdc
report_timing

ot-shell 中其它常用命令:

Command Type Arguments Description Example
read_celllib builder [-min | -max] file read the cell library for early and late splits read_celllib mylib.lib
read_verilog builder file read the verilog netlist read_verilog mynetlist.v
read_sdc builder file read a Synopsys Design Constraint file read_sdc myrule.sdc
read_spef builder file read parasitics in SPEF read_spef myparasitics.spef
update_timing action none update the timing update_timing
report_timing action [-num_paths k] report the critical paths report_timing -num_paths 10
report_tns action none report the total negative slack report_tns
report_wns action none report the worst negative slack report_wns
dump_graph accessor [-o file] dump the timing graph to a DOT format dump_graph
dump_timer accessor [-o file] dump the design statistics dump_timer

dump_graph 可用于生成 DOT 格式图片：

ot_dump_graph

有关 .sdc 约束文件

目前只支持以下语法：

Command Type Description
set_input_delay timing constraint sets input delay on an input port relative to a clock signal
set_output_delay timing constraint sets output delay on an output port relative to a clock signal
create_clock timing constraint creates a clock and defines its waveform in the current design
set_input_transition system interface sets a fixed transition time on an input port
set_load system interface sets the load capacitance value on an output port

有关 .v 文件

  • OpenTimer reads gate-level (aka structural) verilog files (.v) to initialize circuit netlists. Logics are described by gates and modules only. There are no always blocks or assign statements.

    • 需要先转为门级电路

项目集成

可使用 cmake 将 OpenTimer 添加为 subproject。如下修改 CMakeLists：

cmake_minimum_required (VERSION 3.9)                  # CMake minimum version
project(app)                                          # your OpenTimer application
add_subdirectory(OpenTimer)                           # add OpenTimer project
include_directories(${PROJECT_SOURCE_DIR}/OpenTimer)  # add OpenTimer include

set(CMAKE_CXX_STANDARD 17)                            # enable c++17
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(Threads REQUIRED)                        # thread library (pthread)

add_executable(app app.cpp)                           # link to your app.cpp
target_link_libraries(app OpenTimer Threads::Threads stdc++fs)

开源协议

  • Synopsys TAP-in 使用 Synopsys SDC License

  • NanGate 45nm Library 使用 Nangate Open Cell Library License

  • OpenTimer 核心代码及其它组件使用 MIT License

可供实验使用