Inter-site routing issues when routing DCP containing Processor System Reset block (proc_sys_reset)

[chrmarlyn]

Hello again RapidWright devs!

I have run into an issue when trying to perform inter-site routing on a DCP containing Xilinx’s Processor System Reset block (proc_sys_reset). The DCP was generated from the Vivado example project Versal CPM QDMA EP Design (Part based) from the built-in project catalogue, and the board that’s used is the xcvp1202-vsva2783-3HP-e-S. I am working with Vivado 2025.1.

I have tried the following combinations of intra- and inter-site routing (on both the master and 2025.1.2 branch) and gotten three different error messages:

1. Routing each site individually using SiteInsts and routeSite() + routing the whole design with RWRoute.routeDesignFullNonTimingDriven(), resulting in the following error:

  File "RWRoute.java", line 2392, in com.xilinx.rapidwright.rwroute.RWRoute.routeDesignFullNonTimingDriven
Exception: Java Exception

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "c:\route_test.py", line 22, in <module>
    rwr = RWRoute.routeDesignFullNonTimingDriven(design)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
java.lang.java.lang.RuntimeException: java.lang.RuntimeException: ERROR: Net on SLICE_X57Y104/FFF.D'soc_vip_i/rst_versal_cips_0_199M/U0/EXT_LPF/asr_d1' is not an alias of 'GLOBAL_LOGIC0'

2. Routing each site individually using SiteInsts and routeSite() + doing partial routing with PartialRouter.routeDesignPartialNonTimingDriven(design, unrouted), also results in an error:

Traceback (most recent call last):
  File "PartialRouter.java", line 778, in com.xilinx.rapidwright.rwroute.PartialRouter.routeDesignPartialNonTimingDriven
Exception: Java Exception

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:\route_test.py", line 26, in <module>
    PartialRouter.routeDesignPartialNonTimingDriven(design, unrouted)
java.lang.java.lang.NullPointerException: java.lang.NullPointerException: Cannot invoke "com.xilinx.rapidwright.device.Node.getIntentCode()" because "endNode" is null

3. Attempting to intra-site-route with design.routeSites(), which throws the following error:

Traceback (most recent call last):
  File "com.xilinx.rapidwright.design.Design.java", line 0, in com.xilinx.rapidwright.design.Design.routeSites
Exception: Java Exception

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:\route_test.py", line 19, in <module>
    design.routeSites()
java.lang.java.lang.RuntimeException: java.lang.RuntimeException: ERROR: Unable to route soc_vip_i/axi_noc_0/inst/MC0_ddrc/inst/noc_ddr4_phy/inst/BANK_WRAPPER_INST0/FIFO_EMPTY[3] in site XPHY_X3Y0

If you have a moment to look into this, I’d really appreciate your help as it seems there might be a bug.

Here is my code and the relevant files:
vp120_test_placed.zip

import rapidwright

from com.xilinx.rapidwright.design import Design
from com.xilinx.rapidwright.rwroute import RWRoute, PartialRouter

design = Design.readCheckpoint(r"C:\vp120_test_placed.dcp", r"C:\vp120_test_placed.edn")

sites = ["SLICE_X72Y2", "SLICE_X73Y3"]

# Intra-site routing per site
for site in sites:
     si = design.getSiteInstFromSiteName(site)
     print(si)
     si.routeSite()

# Intra-site routing, routes entire design
# design.routeSites()

# Inter-site routing with RWRoute
# rwr = RWRoute.routeDesignFullNonTimingDriven(design)

# Inter-site routing with PartialRouter
unrouted = PartialRouter.getUnroutedPins(design)
PartialRouter.routeDesignPartialNonTimingDriven(design, unrouted)

Thanks in advance!

[clavin-xlnx]

Thanks @chrmarlyn for the test case. I was able to successfully load this design into Vivado 2025.1 and route the design. However, RWRoute in RapidWright has a number of issues that we need to resolve before it can route this design on its own. Although it is not working yet (give us some time), I don't believe there is a need to run anything but RWRoute.routeDesignNonTimingDriven(). You should not need to run any intra-site routing as that is already done by the placer.

For now, I would recommend you simply route this design in Vivado while we work on getting this working in RapidWright.

[chrmarlyn]

Hi again @clavin-xlnx !

Thank you so much for the clarification. I'll have Vivado do the routing for now then. Also, thanks for the tip regarding RWRoute. Your help is appreciated as always!