hardening.md

Hardening the multi project harness

The strategy is:

• harden each submodule with a config like this one for ws2812

  • the key config is set ::env(DESIGN_IS_CORE) 0 which makes sure that metal5 is not used for routing

• copy all the gds and lef files to multi_project_harness/macros

  • this is done with update_macros.sh

• harden top level macro that includes all the subprojects

  • copy [multi_project_harness.v] to the openlane src/ directory
  • use this config
  • have to modify multi_project_harness.v to add:
    • `include blackbox.v
    • `define MPRJ_IO_PADS 38

• copy this gds and lef file to the caravel user project directory and run the caravel makefile to add the macro

  • don't know how to do this part
  • make in caravel/openlane
  • current is 1800 x 1800 um but mostly empty space

Current results for top level macro

with auto placing macros

    tritonRoute_violations :                  180
          Short_violations :                  170
         MetSpc_violations :                   10
        OffGrid_violations :                    0
        MinHole_violations :                    0
          Other_violations :                    0
          Magic_violations :                 1126
        antenna_violations :                  110
          lvs_total_errors :                  102

with hand placed macros

    tritonRoute_violations :                    3
          Short_violations :                    3
         MetSpc_violations :                    0
        OffGrid_violations :                    0
        MinHole_violations :                    0
          Other_violations :                    0
          Magic_violations :                  922
        antenna_violations :                  102
          lvs_total_errors :                    3

slightly wider spaced macros

    tritonRoute_violations :                    0
          Short_violations :                    0
         MetSpc_violations :                    0
        OffGrid_violations :                    0
        MinHole_violations :                    0
          Other_violations :                    0
          Magic_violations :                  501
        antenna_violations :                  105
          lvs_total_errors :                    0

Magic violations:

Metal3 > 3um spacing to unrelated m3 < 0.4um (met3.3d)
All nwells must contain metal-connected N+ taps (nwell.4)
Metal1 > 3um spacing to unrelated m1 < 0.28um (met1.3b)
Metal2 > 3um spacing to unrelated m2 < 0.28um (met2.3b)

Current results for submodules

All the DRC errors reported are of the type

• All nwells must contain metal-connected N+ taps (nwell.4)
• Min area of metal1 holes > 0.14um^2 (met1.7)

ws2812

    tritonRoute_violations :                    0
          Short_violations :                    0
         MetSpc_violations :                    0
        OffGrid_violations :                    0
        MinHole_violations :                    0
          Other_violations :                    0
          Magic_violations :                   13
        antenna_violations :                    4
          lvs_total_errors :                    0

vga_clock

    tritonRoute_violations :                    0
          Short_violations :                    0
         MetSpc_violations :                    0
        OffGrid_violations :                    0
        MinHole_violations :                    0
          Other_violations :                    0
          Magic_violations :                   10
        antenna_violations :                    0
          lvs_total_errors :                    0

seven_segment_seconds

    tritonRoute_violations :                    0
          Short_violations :                    0
         MetSpc_violations :                    0
        OffGrid_violations :                    0
        MinHole_violations :                    0
          Other_violations :                    0
          Magic_violations :                    6
        antenna_violations :                    0
          lvs_total_errors :                    0

spinet5

    tritonRoute_violations :                    0
          Short_violations :                    0
         MetSpc_violations :                    0
        OffGrid_violations :                    0
        MinHole_violations :                    0
          Other_violations :                    0
          Magic_violations :                   32
        antenna_violations :                    1
          lvs_total_errors :                    0

asic_freq

    tritonRoute_violations :                    0
          Short_violations :                    0
         MetSpc_violations :                    0
        OffGrid_violations :                    0
        MinHole_violations :                    0
          Other_violations :                    0
          Magic_violations :                   37
        antenna_violations :                    6
          lvs_total_errors :                    0

watch_hhmm

    tritonRoute_violations :                    0
          Short_violations :                    0
         MetSpc_violations :                    0
        OffGrid_violations :                    0
        MinHole_violations :                    0
          Other_violations :                    0
          Magic_violations :                    5
        antenna_violations :                    0
          lvs_total_errors :                    0