ICC中plan_group与bounds的区别？
时间：10-02
整理：3721RD
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create_plan_group:
This command defines exclusive region-based placement constraints for coarse placement. Plan groups restrict the placement of cells to a specific region of the core area.
create_bounds:
The create_bounds command allows the user to define region-based placement constraints for coarse placement. There are two different types of bounds available:move bounds and group bounds. Move bounds restrict the placement of cells to a specific region of the core area. Move bounds require absolute coordinates to be specified, using the -coordinate option.
Group bounds, on the other hand, are floating region constraints. Cells in the same group bound will be placed within a specified bound but the absolute coordinates are not fixed. Instead, they are optimized by the placer. The -dimension option needs to be specified for a group bound.
想问一下，用create_plan_group设置出来的那个方框的Dimension设置的依据是?然后这个方框的位置可以随意放?是不是一定要放在Core内?是不是可以这样理解，icc为group指定的一堆cell在core中找到一个方框大小的位置，然后根据utilizition来优化布局。
而Bounds设置的方框一定要放在core内，它包含的cell不能跑到设置的方框的外面?
create_plan_group:
This command defines exclusive region-based placement constraints for coarse placement. Plan groups restrict the placement of cells to a specific region of the core area.
create_bounds:
The create_bounds command allows the user to define region-based placement constraints for coarse placement. There are two different types of bounds available:move bounds and group bounds. Move bounds restrict the placement of cells to a specific region of the core area. Move bounds require absolute coordinates to be specified, using the -coordinate option.
Group bounds, on the other hand, are floating region constraints. Cells in the same group bound will be placed within a specified bound but the absolute coordinates are not fixed. Instead, they are optimized by the placer. The -dimension option needs to be specified for a group bound.
想问一下，用create_plan_group设置出来的那个方框的Dimension设置的依据是?然后这个方框的位置可以随意放?是不是一定要放在Core内?是不是可以这样理解，icc为group指定的一堆cell在core中找到一个方框大小的位置，然后根据utilizition来优化布局。
而Bounds设置的方框一定要放在core内，它包含的cell不能跑到设置的方框的外面?
plan_group 侧重于partition概念， hier flow用的多，
bounds 是设一个物理约束，不一定是hard constraint，
plan——group一定是hard bounds， 反之不是，
你好，看了下资料里面说plan group是用于hier，create plan group----commit fp plan group
然后对划分的plan group分别进行timing plan，place，clock，route最后generate ILM,FRAM，然后在顶层重组
我在fp里面做了几个plan group，但是没有commit,也没有做timing plan,然后整个design一起做place以及CTS
report timing以及congestion都过了 这样应该还是flatten模式
但是CTS的时候，保持时间违例比较多，也无法优化，clock_opt直接abnormally teminated
created_bound是不是就是用在flatten模式下，floorplan或者placement的时候创建?
我这个相当于是个小型的SOC，有几个硬核，还有另外几个功能模块，我放在了plan group里面
请问下适合用什么方式呢
问题解决了么?能否分享一下是怎么做的?O(∩_∩)O谢谢
create_plan_group是基于logic module建的，没有固定区域， bound就是把cell圈在一起