Browse Prior Art Database

Buffer moving method

IP.com Disclosure Number: IPCOM000127612D
Original Publication Date: 2005-Sep-06
Included in the Prior Art Database: 2005-Sep-06
Document File: 4 page(s) / 89K

Publishing Venue

IBM

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Buffer moving method

This invention is relating to the chip (ASIC) layout tool.

It is not easy to make an appropriate placement automatically. Even after the timing driven placement, sometimes there is a possibility that some buffers must be moved manually. In that case, we must prepare the list of instance name of these buffers (they are not necessarily buffers, but can be any cells) and then move them one by one in accordance with that list. After making a move, usually the buffer that was moved is then marked on that list in order to distinguish ones that are not yet moved from the ones already moved. If there are too many buffers to be moved, it takes long time since movement and marking should be done one by one. This invention eliminates the necessity of preparation of that list, therefore buffers can be moved without marking the list. This improve total TAT of the manual chip placement.

1. display cells that are needed to be moved using a specific color, say green for example. (Below is the example.)

2. Then move cells using mouse drag&drop function as shown in the below screen shot.

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3.Then, just after finishing the movement of one cell, display that cell using the different color than its original. Below screen shot uses "red" for this.

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4. After moving all cells, all cells must be shown in red. Therefore you can under...