open-source-silicon.dev

<@U017FJJJ8P2> I tried running your design here with some modified options, but not enough RAM ... `yosys`  ended up OOM'd when rewriting the verilog. :confused:

With diode insertion strategy 0 you get 1000's of violations though, so not a chance this would work. I tried my custom script on it, it gets that down to 20, 2/3 of them probably being "fine" and ~ 7 needing manual tweaks.

Yeah, it stresses my 16G machine. It will only route at very low density, giving long routes and shitty timing. I'm srhinking the design by 1/3, too much complexity. Using 8 stage pipe instead of 12. We'll see how that goes.

```set script_dir [file dirname [file normalize [info script]]]

set ::env(DESIGN_NAME) user_project_example

set ::env(VERILOG_FILES) "\
   $script_dir/../../verilog/rtl/defines.v \
   $script_dir/../../verilog/rtl/user_proj_example.v"

set ::env(BASE_SDC_FILE) \
   "$script_dir/../../verilog/rtl/user_proj_example.sdc"

set ::env(CLOCK_PORT) "wb_clk_i"
set ::env(CLOCK_NET) "wb_clk_i user_clock2"
set ::env(CLOCK_PERIOD) "20"

set ::env(FP_SIZING) absolute
set ::env(DIE_AREA) "0 0 2900 3500"
set ::env(DESIGN_IS_CORE) 0

set ::env(FP_PIN_ORDER_CFG) $script_dir/pin_order.cfg
set ::env(PL_TARGET_DENSITY) 0.30

set ::env(DIODE_INSERTION_STRATEGY) 0

# Need to fix a FastRoute bug for this to work, but it's good
# for a sense of "isolation"
set ::env(MAGIC_ZEROIZE_ORIGIN) 0

set ::env(ROUTING_CORES) 8```


That's the config I was using and it was routing just fine.  I removed a bunch of options that where either doing nothing or that I didn't see as good idea and bumped density to 0.3  since 0.22 is really low.

Even with diodes added. (diodes using my custom script, not using default openlane)

Then, I'm totally baffled! What tool and pdk releases are you using?

Seeing a bunch of these. Are they significant?
```ABC: Node 20729 has dup fanin 20728.
ABC: Node 20731 has dup fanin 19943.
ABC: Node 20731 has dup fanin 20730.
ABC: Node 20731 has dup fanin 19943.
ABC: Node 20731 has dup fanin 20730.
ABC: Node 20733 has dup fanin 19953.```
