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AbstractBlockageCoverLayers on not flatten memory instance

samung
Hello,

I would like to understand better the AbstractBlockageCoverLayers function in Abstract generator Tool, step Abstract (Blockage).

absSetBinOption("Core" "AbstractBlockageCoverLayers" "M1 M2X M3X ")


Actually, I would like to define some blockages, let's say I have my "memory instance" layout up to MX, so it means the vdd/vss are in MX, but there are some layers from M1 to MX-1 in the "memory instance". 
The access pins are located at the edges of the "memory instance".

I would like to generate an ABSTRACT view as follow : "cover blockage" for M1 to MX-1 and "Detailed Blocakge" for MX.


When I generate the ABSTRACT view, I just have : the MX layer, I don't have the other Metal cover layers.

My input : the "memory instance" layout up to MX (meaning that with Virtuoso Layout Eiditng, i see all the metal layers), but the "memory instance" is not flatten (meaning that it is made of different cells : array_blxxx cell, master control cell ...).


So, do I have to do a flatten of all the "memory instance" cells to be able to generate the different metal cover layers in the ABSTRACT view or is there another way ?

Thanks !!

P.
 
PS :
 
tool version : IC6.1.5-64b.500.9
xxx/cadence_amsams2010.2c_mmsim/lnx/tools/dfII/bin/abstract 
Parents
  • Hello Colin,

    you were right regarding the "Block" attribute. 

    With this setting in the abstract.record :
    absSetBinOption("Block" "AbstractBlockageDetailedLayers" "M3X ")
    absSetBinOption("Block" "AbstractBlockageCoverLayers" "M1 M2X")

    I have my LEF file generated from Abstarct generator Tool with :
    absSetOption("ExportLEFFile" "test2.lef")
    absExportLEF()
     
    OBS
        LAYER M1 ;
          RECT 0 0 34 19.1 ;
        LAYER M2X ;
          RECT 0 0 34 19.1 ;
        LAYER M3X ;
          RECT 0 184.625 34 189.125 ;
          RECT 0 179.425 34 183.925 ;
          ...
          RECT 0 29.005 34 33.505 ;
          RECT 0 22.505 34 27.005 ;
          RECT 0 17.305 34 21.805 ;
      END
     
    NB : of course, i have changed the sizes of the layers in the copy-paste here, to write this request here.
     
    So I have what I want in the LEF, regarding teh OBSTRUCTION with the cover layers. However, the ABSTRACT view, just contain the last metal layer for the power/ground and does'nt contain the cover layers. It has also the PR boundary (this one was already in the input layout view, so I didn't regenerate it). 
     
    Would you know why the 2 views : ABSTRACT and LEF are not consistent regarding the cover layers ?
     
    Thanks a lot !
     
    P. 
Reply
  • Hello Colin,

    you were right regarding the "Block" attribute. 

    With this setting in the abstract.record :
    absSetBinOption("Block" "AbstractBlockageDetailedLayers" "M3X ")
    absSetBinOption("Block" "AbstractBlockageCoverLayers" "M1 M2X")

    I have my LEF file generated from Abstarct generator Tool with :
    absSetOption("ExportLEFFile" "test2.lef")
    absExportLEF()
     
    OBS
        LAYER M1 ;
          RECT 0 0 34 19.1 ;
        LAYER M2X ;
          RECT 0 0 34 19.1 ;
        LAYER M3X ;
          RECT 0 184.625 34 189.125 ;
          RECT 0 179.425 34 183.925 ;
          ...
          RECT 0 29.005 34 33.505 ;
          RECT 0 22.505 34 27.005 ;
          RECT 0 17.305 34 21.805 ;
      END
     
    NB : of course, i have changed the sizes of the layers in the copy-paste here, to write this request here.
     
    So I have what I want in the LEF, regarding teh OBSTRUCTION with the cover layers. However, the ABSTRACT view, just contain the last metal layer for the power/ground and does'nt contain the cover layers. It has also the PR boundary (this one was already in the input layout view, so I didn't regenerate it). 
     
    Would you know why the 2 views : ABSTRACT and LEF are not consistent regarding the cover layers ?
     
    Thanks a lot !
     
    P. 
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