Timing Analyzer 综述

相关文件特征和流程

输入文件：

输出文件：

TWX文件：只能在时序分析器中查看的XML时序分析结果的报告
TWR文件：文本格式的时序分析结果的报告
TSI文件：Timing Specification Interaction (TSI) is an ASCII report detailing the interaction between overlapping timing specifications (constraints).
HTML文件:HTML格式的时序分析结果的报告
NGD文件：用于探针定位查看的可选项
UCF文件：用于约束的可选项

常见设计问题：

基础分析路径类型：时钟频率；输入建立时间；输出时钟传送延时；端口到端口组合延时

命令行打开时序分析：timingan –ise project.ise –ucf constraints.ucf –ngd design.ngd design.ncd constraints.pcf report.twx.无参数时会弹出对话框进行文件选择

分析流程：

映射后静态时序分析：在Processes for Current Source窗口选Generate Post-Map Static Timing
布线后静态时序分析：在Processes for Current Source窗口选Generate Post-Place & Route Static Timing

隐藏工具栏：View > Toolbars >Timing Analyzer
查看时钟：Analyze > Clocks
查看时序分析设置：Analyze > Settings
探针定位显示路径：在TWX文件中点击路径超链接，跳转到电路图相应位置
Technology View-Exploration Mode：查看路径相关联的器件，选定路径右键后选Show <Implemented | Translated> path to Technology ViewExploration Mode跳转
Floorplan-Implemented关联显示：打开Floorplan视图，选定网线、元件、路径即实时显示
从设计总报告跳转：在报告中选择一个时序约束，即可打开并定位到相关的时序报告信息
Constraint Improvement Wizard：通过报告中未覆盖约束路径超链接打开，其中给出了提高约束覆盖率的方法和建议
Timing Improvement Wizard：通过不满足时序约束路径的超链接打开，其中给出了改善延时性能的建议和方法
提取时序信息：Analyze > Query Nets or Analyze > Query Timegroups
参数设置：颜色、字体（类型/大小/预览）、报告包含内容（Design statistics/Site locations column/Physical names in detailed path/Show Timing Report Tips dialog box)、报告格式(HTML/Text) 、查找方案（Edit > Preferences > Find What Category tab，然后选择Allow Wildcards (*, ?)、Allow Regular Expressions、Match Case）

创建时序约束分析报告：Analyze > Against Timing Constraints
创建指定路径终点分析报告：Analyze > Analyze Against User Specified Paths > by Defining Endpoints
创建指定路径时钟和IO时序分析报告：Analyze > Against User Specified Paths > by Defining Clock and IO Timing
创建时钟报告：Analyze > Clocks然后File > Save As
创建设置报告：Analyze > Settings然后File > Save As
UCF和PCF约束全忽略分析报告：Analyze > Against Auto Generated Constraints
创建未布线延时：Analyze > Query Nets
时间组报告：Analyze > Query Timegroups
报告参数设置：Edit > Preferences选择Timing Analyzer
创建约束对应路径报告：Analyze > Against Timing Constraints选择Generate constraints interaction report
查看约束对应路径报告：可用于理解多约束的优先级别（从低到高）

创建未约束路径报告：Analyze > Against Timing Constraints选择Report Unconstrained Path option
创建Offsets Summary Report
查看时序分析报告：设计信息头、所有报告信息、所有警告信息、所有约束信息和每个约束覆盖的路径、未满足约束条件约束量、数据报告、约束覆盖时序分析总结、时序分析设置
可行操作：启/禁时序约束、用户指定路径分析、使用路径追踪、通过网线进行路径过滤、重置所有路径过滤（Analyze > Reset All Path Filters）
路径名称和简写

Abbreviation	Path Type	Default
reg_sr_r	Asynchronous Set/Reset Recovery times	Disabled
reg_sr_o	Asynchronous Set/Reset Propagation times to output	Disabled
lat_d_q	Data to output for transparent latch	Disabled
ram_d_o	RAM data to output	Disabled
ram_we_o	RAM WE to output	Enabled
tbuf_t_o	TBUF 3-state control to output	Enabled
tbuf_i_o	TBUF input to output	Enabled
io_pad_i	I/O pad to input	Enabled
io_t_pad	I/O 3-state control to pad	Enabled
io_o_i	Bidirectional 3-state I/O output to input	Enabled
io_o_pad	I/O output to pad	Enabled
reg_sr_clk	Synchronous Set/Reset setup/hold	Enabled

delete	Deletes analysis.
disable_constraints	Disables a physical timing constraint from timing analysis.
disable_cpt	Disables specified or all components associated with path tracing control from timing analysis.
enable_constraints	Enables a physical timing constraint from timing analysis.
enable_cpt	Enables specified or all components associated with path tracing control from timing analysis.
get	Extracts values for the specified property.
new	Creates new analysis for currently active design.
properties	Gives information on command properties.
reset	Resets all path filters to their default values.
run	Runs analysis process and creates timing, net or timegroup report.
save_as	Saves report or settings to file.
set	Sets the specified property to a specified value.
set_constraint	Sets a constraint for custom analysis.
set_endpoints	Sets path endpoints for custom analysis.
set_filter	Sets or removes filter constraints for timing analysis.
set_query	Sets nets or timegroups for detailed nets or timegroup report.
show_settings	Creates a settings report for analysis.

各命令具体格式和参数含义用法从略。。。