今天要介绍的数字后端基本概念是Placement Blockage. Placement blockage是大家在floorplan时经常用的一种人为约束。可以有效控制区域的density。从而避免congestion的问题,提高routing的效率。 Placement blockage的类型很多,一共分为9种,分别对应hard, hard_macro, soft, partial, category, rp_group,allow_buffer_only,al...
在ICC2(Cadence Innovus IC Compiler II)中,布局阻塞(Placement Blockage)是一种用于限制标准单元(standard cell)或宏单元(macro cell)在芯片布局过程中放置区域的技术。通过定义布局阻塞,设计师可以控制哪些区域可以放置单元,哪些区域不可以,从而优化芯片的布局、布线以及最终的性能。 为何需要为库单元(Lib Cell)创建布...
ICC2中,设置partial placement blockage的命令是 create_placement_blockage -type partial -blocked_percentage 75 -boundary {{0 0} {0 100} {100 100} {100 0}} 加上partial blockage之后,划定的范围内会有指定百分比的区域被block住,-blocked_percentage 选项就是用来指定多少百分比的区域被block。 注意:-bloc...
这里讲其中的第二种:加Checkerboard的Placement Blockage。 分析:首先看些这些Cell的类型,一般我们不希望在Narrow Channel里面有Function的Cell,只希望是一些简单的Buffer。如果是比较宽的Channel,那倒是可以放Function Cell的,不过我们也要保证它们的密度不能太高,否则也会导致IR-drop,限制密度的方法是打Partial Blockage。
1. Understanding Placement Blockage: Placement blockage refers to the condition when the placement of cells within a design layout is obstructed due to the presence of obstacles or dense regions. Such blockages can arise from floorplan constraints, physical design rules, or varying design requirements...
Placement Routing Blockage can be Area specific or can be Component Specific (associated with Instance). If it's associated with any Instance - Means - the moment you move Instance from one location to other (with in the Chip), Blockage also move along with that. ...
To check instance overlapping with placement blockage Hi all, How do we check the instance we are placing is not overlapping with the placement blockage using encounter commands. Thanks suraj
For instance, some embodiments route a network of a circuit design (e.g., clock net, date net) by generating a congestion map based on modeling layer-assigned networks, considering (e.g., accounting for) routing congestion based on a placement blockage of the circuit design, or some ...
今天要介绍的数字后端基本概念是Placement Blockage. Placement blockage是大家在floorplan时经常用的一种人为约束。可以有效控制区域的density。从而避免congestion的问题,提高routing的效率。 Placement blockage的类型很多,一共分为9种,分别对应hard, hard_macro, soft, partial, category, rp_group,allow_buffer_only,al...
今天要介绍的图形界面按键是Create Placement Blockage键 功能非常简单,创建一个Placement blockage。快捷键是Shift+Y。 Placement blockage是大家在floorplan时经常用的一种人为约束。可以有效控制区域的density。从而避免congestion的问题,提高routing的效率。 其实在Innovus中,一共有4种placement blockage, 对应的type分别是...