Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

difference between database grid and manufacturing grid?

Status
Not open for further replies.

coffeelox

Junior Member level 3
Joined
Sep 22, 2006
Messages
26
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,281
Activity points
1,436
manufacturing grid

recently I noticed in my tech file, it stated as follows,

0.001 Database Grid (for 3rd party tools)
0.01 Manufacturing Grid size and snap spacing

what's the difference between database grid and manufacturing grid? how can i set grid in layout then?

thanks...
 

erikl

Super Moderator
Staff member
Joined
Sep 9, 2008
Messages
8,112
Helped
2,688
Reputation
5,356
Reaction score
2,289
Trophy points
1,393
Location
Germany
Activity points
44,153
coffeelox said:
0.001 Database Grid (for 3rd party tools)
0.01 Manufacturing Grid size and snap spacing

what's the difference between database grid and manufacturing grid? how can i set grid in layout then?
3rd party tools should be applicable to any process size, hence their calculation resolution is rather high. In order to enable the presentation of their results (e.g. polygon generation), it's usually recommended to use a Database Grid with high resolution. In such case I'd suggest to set the minor grid size to the Database Grid size, the major grid size to the Manufacturing Grid size, and the snap spacing to either the Manufacturing Grid size or to (2 * Manufacturing Grid size). In the latter case you always have the chance to correct a rounding error by temporarily setting the snap space to (1 * Manufacturing Grid size).
During streamOut (GDSII generation), all data points will be set to the next Manufacturing Grid point.
 

kumar_eee

Advanced Member level 3
Joined
Sep 22, 2004
Messages
814
Helped
139
Reputation
276
Reaction score
109
Trophy points
1,323
Location
Bangalore,India
Activity points
4,676
Manufacturing grid is determined by the smallest geometry that a
semiconductor foundry can process. All drawn geometries during physical
design must snap to this manufacturing grid.

Routing grids or tracks are used by physical synthesis and place-and-route
tools during detail routing. The routing tracks can be grid-based, gridlessbased,
or subgrid-based.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top