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question on multiple layout views to be use for 1 schematic

zeroskills

quick  question on multiple layout views to be use for 1 schematic. someone is proposing to use 2 layout views such as layout; layoutv2 for 1 schematic. i think the reasoning was like this, he wanted a 2 versions of layout with one schematic like the example below...

cell: opamp

- schematic 

- layout - original layout

- layoutv2 - exact copy of the original layout, but caps have been modified to fit a specific spot in chip

----> the cell opamp have 1 schematic but have 2 layout view, layout is used on the left side of the chip and layoutv2 is used on the right side of the chip.

i asked, why not just have another version of the circuit/schematic (opamp --> opamp_v2), with 1 schematic and 1 layout view. so my reasoning was like this:

 

cell: opamp

- schematic 

- layout - original layout

cell: opamp_v2

- schematic 

- layout - exact copy of the original layout, but caps have been modified to fit a specific spot in chip

----> opamp layout is used in left side and opamp_v2 is used on right side.

but he insist to just have 1 version of the circuit schematic since if he did have another version it would be just the same. also i think he doesn't want to change another version of the same circuit if he have changes, like his changing the same circuit twice.

so is it possible to have 2 layout views of the same schematic? since i've been doing layout, i never have taped out any cell or citcuit that have a different layout view or shcamtic view, it's always been layout and schematic for 1 cell and that's it, and not for example, 1 cell then layout2, schematic.

Parents

  • we are using vxl, an i know that if you make a copy of the original layout, either by copy cell or save as, the copied cell would still retain the info of the orginal cell. so if i copied opamp layout and save it as layoutv2,  layoutv2 would be ther same as the copied layout.

    so it's possible or ok to use 2 layout views for 1 schematic, as long as you configure it properly. would there beany problem for tapeout check or layout hierarchy, like from my example, everything is layout except for opamp cell having layout and layoutv2.

    i'm used to having schematic and layout content per cell, and if i wanted another veriosn of that cell i would call it opamp_v2 with layout and schematic content instead of opamp cell having schematic, layout and layoutv2.

    but is it adviceable to have 2 layout views in 1 circuit/schematic? 

    by the way, thanks for the advice guys.

Reply

  • we are using vxl, an i know that if you make a copy of the original layout, either by copy cell or save as, the copied cell would still retain the info of the orginal cell. so if i copied opamp layout and save it as layoutv2,  layoutv2 would be ther same as the copied layout.

    so it's possible or ok to use 2 layout views for 1 schematic, as long as you configure it properly. would there beany problem for tapeout check or layout hierarchy, like from my example, everything is layout except for opamp cell having layout and layoutv2.

    i'm used to having schematic and layout content per cell, and if i wanted another veriosn of that cell i would call it opamp_v2 with layout and schematic content instead of opamp cell having schematic, layout and layoutv2.

    but is it adviceable to have 2 layout views in 1 circuit/schematic? 

    by the way, thanks for the advice guys.

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