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ucf-to-xdc.adoc

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UCF2XDC converter

The ucf-to-xdc.sh script for Xilinx EDA-tools: that convert ISE-style to Vivado-style constraints (sdc → xdc)

Russian description available here: http://idoka.ru/my-fpga-and-asic-scripts/#_UCF_XDC

usage

Just type:

./ucf-to-xdc.sh FILENAME.ucf

that produce the file FILENAME.xdc in current dir

input file example [ucf]

NET "DDR_DQ[0]"  LOC = "AY12"  |  IOSTANDARD = SSTL15_T_DCI  |  VCCAUX_IO = NORMAL  |  SLEW = FAST;
NET "DDR_DQ[1]"  LOC = "AW12"  |  IOSTANDARD = SSTL15_T_DCI  |  VCCAUX_IO = NORMAL  |  SLEW = FAST;

output file example [xdc]

set_property PACKAGE_PIN AY12         [get_ports DDR_DQ[0]]
set_property IOSTANDARD  SSTL15_T_DCI [get_ports DDR_DQ[0]]
set_property VCCAUX_IO   NORMAL       [get_ports DDR_DQ[0]]
set_property SLEW        FAST         [get_ports DDR_DQ[0]]

set_property PACKAGE_PIN AW12         [get_ports DDR_DQ[1]]
set_property IOSTANDARD  SSTL15_T_DCI [get_ports DDR_DQ[1]]
set_property VCCAUX_IO   NORMAL       [get_ports DDR_DQ[1]]
set_property SLEW        FAST         [get_ports DDR_DQ[1]]

Limitation

This script works only with IO-location and standard constraints

Explanation of working

sed command explanation:

  • /^$/d - remove all empty strings

  • s/[\"=|;]//g - remove any of these symbols: ", =, |, ;

  • s/[\t]*//g - remove all horizontal tabulation symbol

  • s/\ \{1,\}/\ /g - replace several whitespaces by one (i.e.: " " → " ")

  • Formatting output string (parted by several string):

    • s/NET[ ]\(.\)[ ]*.. - extract signal name

    • ..LOC[ ]\([A-Z0-9]\)[ ]*.. - extract pin name

    • ..IOSTANDARD[ ]\([_A-Z0-9]\)[ ]*.. - extract IO-standard

    • ..VCCAUX_IO[ ]\([A-Z]\)[ ]*.. - extract VCCAUX value

    • ..SLEW[ ]\([A-Z]\)/.. - extract slewrate

    • ..set_property PACKAGE_PIN \2 \[get_ports \1\]\n.. - generate location constraint

    • ..set_property IOSTANDARD \3 \[get_ports \1\]\n.. - generate IO-standard constraint

    • ..set_property VCCAUX_IO \4 \[get_ports \1\]\n.. - generate VCCAUX value constraint

    • ..set_property SLEW \5 \[get_ports \1\]\n\n/g - generate slew rate constraint

ToDo

  • a position independent parser of ucf

  • move to new one-string format of xdc, like this:

    set_property -dict {PACKAGE_PIN AY12  IOSTANDARD SSTL15_T_DCI  VCCAUX_IO NORMAL  SLEW FAST} [get_ports DDR_DQ[0]];

Known issues

  • current version of parser ucf is a position dependent; for some ucf needed changing of order of mention key according input ucf