Dennis Chia Sheng Huang

US Patent:

6782520, Aug 24, 2004

Filed:

Aug 12, 2002

Appl. No.:

10/217851

Inventors:

Mitsuru Igusa - Los Gatos CA
Wei-Jin Dai - Cupertino CA
Dennis Huang - Fremont CA

Assignee:

Cadence Design Systems, Inc. - San Jose CA

International Classification:

G06F 1750

US Classification:

716 9, 716 10, 716 11, 716 12, 716 13

Abstract:

An integrated circuit (IC) layout process is organized into two phases. During the Phase of the process, a preliminary placement plan is generated fixing the position of every cell of an IC design described by a gate level netlist. A trial routing plan is also generated establishing approximate routes of the nets that are to interconnect cell terminals. The placement plan and the trial routing plan are then iteratively analyzed and modified as necessary to ensure that the layout meets various signal path timing, signal integrity, and power distribution and other constraints. Thereafter, at the start of Phase of the layout process, the trial routing plan is converted into a detailed routing plan specifying in detail the exact routes to be followed by all nets. The placement plan and detailed routing plan are then iteratively analyzed and modified as necessary to ensure that they meet all design constraints.

US Patent:

20170083185, Mar 23, 2017

Filed:

Sep 16, 2016

Appl. No.:

15/267480

Inventors:

Dennis Huang - Campbell CA, US

International Classification:

G06F 3/0482
G06F 3/0484
G06F 3/01
G06F 3/0488

Abstract:

Example implementations described herein are directed to implementing a transition state between the moving state and the placement state of the graphical object. The transition state contains a visual indicator on the display to indicate that a graphical object is undergoing a placement, along with a temporal indicator to indicate length of time until placement. During the transition phase, input is directed by the GUI towards control of the graphical object in the transition state, whereupon when the graphical object is moved away from the placement location, the transition state may reset, and the temporal indicator may also reset to indicate the refreshed length of time until placement.