【IC设计】ICC1 workshop lab guide 学习笔记——Lab 2 Design Planning Task5-9

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最新推荐文章于 2024-12-10 23:45:29 发布 · 978 阅读

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#Synopsys #IC Compiler #IC设计 #IC后端 #布局规划

文章详细介绍了在集成电路设计中如何创建P/GRings环绕宏组，使用PowerNetworkSynthesis自动化电源网格，并检查时序。此外，还涉及了布局完成后写入DEFFloorplan文件和准备第二次设计放置的流程。

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ICC1 workshop lab guide

ICC1 workshop lab guide

2.5 Create P/G Rings Around Macro Groups

In the task following this one you will use “Power Network Synthesis” (PNS) to
automate the creation of power/ground core and individual macro rings, as well as
vertical and horizontal straps. If you want to create rings around groups of macros,
that is done prior to PNS, which is what this task will accomplish.
在接下来的任务中，你将使用电源网络综合去自动地创建P/G核心和单个宏环，以及垂直和水平绑带。
如果你想在宏组周围创建环，则需要在PNS之前完成，这就是这次要完成的任务。

We have created a script to create P/G rings around six groups of macros. Take a look at the file located at ./scripts/macro_pg_rings.tcl. The P/G rings are created by:
我们已经创建了一个脚本来在六组宏周围创建P/G环。看./scripts/macro_pg_rings.tcl这个文件。这个P/G环被创建为：

Defining a rough “region” that encompasses a group of macros
定义围绕一组宏的粗糙区域
Defining the block ring layers, widths and offsets
定义块环的层数、宽度和偏移量
Creating (committing) the metal routes
创建金属绕线

Execute the script:

source ./scripts/macro_pg_rings.tcl

Take a look at the rings that have been created.
Notice that the “PLL” macro in the upper-left corner is the only macro that
does not have a P/G ring around it - this will be done by PNS.
Notice also that, in addition to the rings around the macro groups, there are
vertical/horizontal straps in between the macros. This is nice feature of the
create_fp_group_block__ring command. It can be disabled with the
-skip_strap option, if preferred.
请注意，左上角的“PLL”宏是唯一一个没有P/G环的宏——这将由PNS完成。
还要注意，除了宏组周围的环之外，宏之间还有垂直/水平带。这是create_fp_group_block__ring命令的一个很好的特性。如果愿意，可以使用-skip_strap选项禁用它。