13 April 2015

Routing

  • It is important for the physically decide the path of actual circuit.
  • Proper routing stands for minimizing the wire length.

Check Points

  • DRC: Design rule check
  • A tool for verifying the layout with the physical layout design rules set so as, to make sure that none of the rules have been violated.
  • LVS: Layout versus schematic
  • It is the method to check the correctness of your layout designed by cross checking with netlist generated from schematic using the tool.
  • Timing

  • After CTS, the routing process determines the precise path for interconnection. This includes the standard cell & macro pins, the pins on the block boundary or pads at the chip boundary.

  • In routing stage, metal & vias are used to create the electrical connection in layout so as, to complete all connection defined by netlist.

  • Most of the routers available are grid base router. There are routing grids defined for the entire layout. Consider it like graph. For grid based routers, there are also preferred routing direction defined for each metal layer.
Consists of following steps
  • Global routing - here, only the routing resources are assigned to the routing end points.

  • Final/ Detailed routing - here, nets are physically routed

  • Search and Repair (remove violations like short, spacing etc)
Routing in done on routing grid.




6 comments:

  1. Can you please elaborate on Search and repair Process? What about Tracking route?

    ReplyDelete
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