get_pblocks in RapidWright

[coherent17]

Hi RapidWright Experts,

Is there a way to retrieve pblock information directly in RapidWright? I couldn't find a method like List<PBlock> design.getPblocks(). Should pblock information be set manually within RapidWright, or is it possible to extract this information directly from a DCP?

Thank you for your help!

[clavin-xlnx]

This is a great question. Typically, RapidWright relies on the pblock shape to be provided via a String. However, it is possible with a bit of work to extract it from the XDC constraints stored in the DCP. RapidWright does not have a Tcl interpreter or Tcl-specific parsing capabilities (yet). However, if the pblock specification commands are consistent, you could extract them like this:

package com.xilinx.rapidwright.examples;

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import com.xilinx.rapidwright.design.ConstraintGroup;
import com.xilinx.rapidwright.design.Design;
import com.xilinx.rapidwright.design.blocks.PBlock;

public class ExtractPBlock {

    public static void main(String[] args) {
        Design d = Design.readCheckpoint("test/RapidWrightDCP/microblazeAndILA_3pblocks.dcp");
        Map<String, PBlock> pblocks = new HashMap<>();
        for (ConstraintGroup cg : ConstraintGroup.values()) {
            for (String tclLine : d.getXDCConstraints(cg)) {
                if (tclLine.contains("resize_pblock")) {
//                    resize_pblock [get_pblocks pblock_base_mb_i] -add {CLOCKREGION_X1Y1:CLOCKREGION_X1Y1}
//                    resize_pblock [get_pblocks pblock_dbg_hub] -add {CLOCKREGION_X0Y1:CLOCKREGION_X0Y1}
//                    resize_pblock [get_pblocks pblock_u_ila_0] -add {CLOCKREGION_X2Y1:CLOCKREGION_X2Y1}
                    String name = tclLine.substring(tclLine.indexOf("[get_pblocks ") + 13,
                            tclLine.indexOf("]"));
                    String range = tclLine.substring(tclLine.indexOf("{") + 1, tclLine.indexOf("}"));
                    pblocks.put(name, new PBlock(d.getDevice(), range));
                }
            }
        }

        for (Entry<String, PBlock> e : pblocks.entrySet()) {
            System.out.println(e.getKey() + "=" + e.getValue());
        }
    }
}

[coherent17]

Hi,

Thanks for the clear example!