markdown/gh_discussions/Query/3644.md

ODB:: Is there any way to unfrozen the master? (Changing the size of dbMaster during the code is running)

Tool: OpenDB

Subcategory: Usage question

Conversation

ApeachM

// master setting
dbMaster *master = dbMaster::create(db_lib, lib_cell_name.c_str());
master->setWidth(width);
master->setHeight(height);
master->setType(dbMasterType::CORE);
...
master->setFrozen();
// connect inst to the master
    
dbInst* inst = dbInst::create(db_block, master, instance_info->inst_name.c_str());

// now I want to change the size of inst, by unfrozen master and resize width and height
// Is my intention of the below pseudo-code possible?
master->setUnFrozen();
master->setWidth(new_width);
master->setHeight(new_height);
master->setFrozen();

I would like to know whether the above pseudo-code is possible.

I want to resize the cell size after the cell size is already determined. (For example, after parsing lef and def). But it seems like not to exist function for unfreezing.

If I want to change the cell size, then should I

1. re-construct the instance,
2. re-construct the new dbMaster,
3. deleting the original instance,
4. and re-connecting the new dbInst to the nets, which was connected with the original one?

I would like to know whether is there another way, which is more simple.

Thanks for the time for reading my question.

Sincerely.

maliberty

Why are you freezing it in the first place?

maliberty

setWidth & setHeight don't care about the frozen status afaik. The key thing is that the port list is frozen. You can't add a dbMTerm to a frozen master.