xschemrc

#### xschemrc system configuration file

#### values may be overridden by user's ~/.xschem/xschemrc configuration file
#### or by project-local ./xschemrc

###########################################################################
#### XSCHEM INSTALLATION DIRECTORY: XSCHEM_SHAREDIR
###########################################################################
#### Normally there is no reason to set this variable if using standard
#### installation. Location of files is set at compile time but may be overridden
#### with following line:
# set XSCHEM_SHAREDIR $env(HOME)/share/xschem

###########################################################################
#### XSCHEM SYSTEM-WIDE DESIGN LIBRARY PATHS: XSCHEM_LIBRARY_PATH
###########################################################################
#### If unset xschem starts with XSCHEM_LIBRARY_PATH set to the default, typically:
# ${HOME}/.xschem/xschem_library
# <install_root>/share/xschem/xschem_library/devices
# <install_root>/share/doc/xschem/examples
# <install_root>/share/doc/xschem/ngspice
# <install_root>/share/doc/xschem/logic
# <install_root>/share/doc/xschem/xschem_simulator
# <install_root>/share/doc/xschem/binto7seg
# <install_root>/share/doc/xschem/pcb
# <install_root>/share/doc/xschem/rom8k

#### Flush any previous definition
set XSCHEM_LIBRARY_PATH {}
#### include standard xschem devices library
append XSCHEM_LIBRARY_PATH :${XSCHEM_SHAREDIR}/xschem_library/devices
append XSCHEM_LIBRARY_PATH :${XSCHEM_SHAREDIR}/xschem_library
## include directory where this xschemrc file is located
append XSCHEM_LIBRARY_PATH :[file dirname [file normalize [info script]]]
#### add ~/.xschem/xschem_library (USER_CONF_DIR is normally ~/.xschem)
append XSCHEM_LIBRARY_PATH :$USER_CONF_DIR/xschem_library 

###########################################################################
#### SET CUSTOM COLORS FOR XSCHEM LIBRARIES MATCHING CERTAIN PATTERNS
###########################################################################
#### each line contains a dircolor(pattern) followed by a color
#### color can be an ordinary name (grey, brown, blue) or a hex code {#77aaff}
#### hex code must be enclosed in braces
array unset dircolor
set dircolor(sky130_fd_pr$) blue
set dircolor(sky130_tests$) blue
set dircolor(xschem_sky130$) blue
set dircolor(xschem_library$) red
set dircolor(devices$) red

###########################################################################
#### WINDOW TO OPEN ON STARTUP: XSCHEM_START_WINDOW
###########################################################################
#### Start without a design if no filename given on command line:
#### To avoid absolute paths, use a path that is relative to one of the
#### XSCHEM_LIBRARY_PATH directories. Default: empty
set XSCHEM_START_WINDOW {sky130_tests/top.sch}

###########################################################################
#### DIRECTORY WHERE SIMULATIONS, NETLIST AND SIMULATOR OUTPUTS ARE PLACED
###########################################################################
#### If unset $USER_CONF_DIR/simulations is assumed (normally ~/.xschem/simulations) 
# set netlist_dir $env(HOME)/.xschem/simulations
#### if this is set to '1' netlists and simulations will go into a simulation/ folder
#### inside the directory containing the top level schematic. Default: not set (0)
# set local_netlist_dir 1

###########################################################################
#### NETLIST AND HIERARCHICAL PRINT EXCLUDE PATTERNS
###########################################################################
#### xschem_libs is a list of patterns of cells to exclude from netlisting.
#### Matching is done as regular expression on full cell path
#### Example:
#### set xschem_libs { {/cmoslib/} {/analoglib/.*pass} buffer }
#### in this case all schematic cells of directory cmoslib and cells containing
#### /analoglib/...pass and buffer will be excluded from netlisting
#### default value: empty
# set xschem_libs {}
#### noprint_libs is a list with same rules as for xschem_libs. This
#### variable controls hierarchical print
#### default value: empty
# set noprint_libs {}
#### nolist_libs is a list with same rules as for xschem_libs. This
#### variable controls cell listing in procedure list_hierarchy.
#### default value: empty
# set nolist_libs {}

###########################################################################
#### CHANGE DEFAULT [] WITH SOME OTHER CHARACTERS FOR BUSSED SIGNALS 
#### IN SPICE NETLISTS (EXAMPLE: DATA[7] --> DATA<7>) 
###########################################################################
#### default: empty (use xschem default, [ ])
# set bus_replacement_char {<>}
#### for XSPICE: replace square brackets as the are used for XSPICE vector nodes.
# set bus_replacement_char {__} 

###########################################################################
#### SOME DEFAULT BEHAVIOR
###########################################################################
#### Allowed values:  spice, verilog, vhdl, tedax, default: spice
# set netlist_type spice

#### Some netlisting options (these are the defaults)
# set verilog_2001 1

#### to use a fixed line width set change_lw to 0 and set some value to line_width
#### these are the defaults
# set line_width 0
# set change_lw 1

#### allow color postscript and svg exports. Default: 1, enable color
# set color_ps 1

#### set paper size: name, height, width. Sizes in 1/72 of an inch (typographical points)
#### default: {a4 842 595}
# set ps_paper_size {a4 842 595}
# set ps_paper_size {letter 792 612}

#### initial size of xschem window you can specify also position with (wxh+x+y)
#### this is the default:
# set initial_geometry {900x600}
set initial_geometry {1280x695+0+0}

#### if set to 0, when zooming out allow the viewport do drift toward the mouse position,
#### allowing to move away by zooming / unzooming with mouse wheel
#### default setting: 0
# set unzoom_nodrift 0

#### if set to 1 full zoom will center the drawing instead of anhoring to lower
#### left corner. Default: 0
set zoom_full_center 1

#### if set to 1 allow to place multiple components with same name.
#### Warning: this is normally not allowed in any simulation netlist.
#### default: 0, do not allow place multiple elements with same name (refdes)
# set disable_unique_names 0

#### if set to 1 continue drawing lines / wires after click
#### default: 0
# set persistent_command 1

#### if set to 1 a wire is inserted when separating components that are
#### connected by pins. Default: not enabled (0)
# set connect_by_kissing 1

#### if set to 1 automatically join/trim wires while editing
#### this may slow down on rally big designs. Can be disabled via menu 
#### default: 0
# set autotrim_wires 0

#### set widget scaling (mainly for font display), this is useful on 4K displays
#### default: unset (tk uses its default) > 1.0 ==> bigger 
# set tk_scaling 1.7

#### use the tclreadline package if available , Default: 1 (enabled).
# set use_tclreadline 1

#### disable some symbol layers. Default: none, all layers are visible.
# set enable_layer(5) 0 ;# example to disable pin red boxes

#### enable to scale grid point size as done with lines at close zoom, default: 0
# set big_grid_points 0

#### enable grouping contiguous bits of bus slices in net->pin instance
#### assignments for verilog netlists. Default: disabled (0)
# set verilog_bitblast 0

#### allow searching the full search path for schematics associated to symbols
#### instead of looking only in symbol directory. Default: disabled (0).
# set search_schematic 0

#### focus the schematic window if mouse goes over it, even if a dialog box
#### is displayed, without needing to click.
#### This allows to move/zoom/pan the schematic while editing attributes.
#### Clicking in the schematic window usually closes the dialog box or starts
#### editing a new component if clicking on a new component.
#### default: enabled (1)
# set autofocus_mainwindow 1

#### replace selected text in text widgets when pasting from clipboard
#### default: enabled (1)
# set text_replace_selection 0

#### set component browser always above drawing canvas.
#### default: enabled (1)
# set component_browser_on_top 0

#### set graph line with multiplier with respect to xschem actual line width
#### default: 2.0
# set graph_linewidth_mult 2.0

###########################################################################
#### EXPORT FORMAT TRANSLATORS, PNG AND PDF
###########################################################################
#### command to translate xpm to png; (assumes command takes source 
#### and dest file as arguments, example: gm convert plot.xpm plot.png)
#### default: {gm convert}
#### Windows ghostscript uses gswin64c
# set to_png {gswin64c -sDEVICE=png16m -o}
# set to_png {gm convert}

#### command to translate ps to pdf; (assumes command takes source
#### and dest file as arguments, example: ps2pdf plot.ps plot.pdf)
#### default: ps2pdf
#### Windows ghostscript uses gswin64c
# set to_pdf {gswin64c -sDEVICE=pdfwrite -o}
# set to_pdf ps2pdf
set to_pdf {ps2pdf -dAutoRotatePages=/None}

###########################################################################
#### UNDO: SAVE ON DISK OR KEEP IN MEMORY
###########################################################################
#### Alloved: 'disk'or 'memory'. 
#### Saving undo on disk is safer but slower on extremely big schematics.
#### In most cases you won't notice any delay. Undo on disk allows previous
#### state recovery in case of crashes. In-memory undo is extremely fast
#### but should a crash occur everything is lost.
#### It is highly recommended to keep undo on disk.
#### Default: disk
# set undo_type disk

###########################################################################
#### CUSTOM GRID / SNAP VALUE SETTINGS
###########################################################################
#### Warning: changing these values will likely break compatibility
#### with existing symbol libraries. Defaults: grid 20, snap 10.
# set cadgrid 20
# set cadsnap 10

###########################################################################
#### CUSTOM COLORS  MAY BE DEFINED HERE
###########################################################################
#  set cadlayers 22
#  set light_colors {
#   "#ffffff" "#0044ee" "#aaaaaa" "#222222" "#229900"
#   "#bb2200" "#00ccee" "#ff0000" "#888800" "#00aaaa"
#   "#880088" "#00ff00" "#0000cc" "#666600" "#557755"
#   "#aa2222" "#7ccc40" "#00ffcc" "#ce0097" "#d2d46b"
#   "#ef6158" "#fdb200" }

#  set dark_colors {
#   "#000000" "#00ccee" "#3f3f3f" "#cccccc" "#88dd00"
#   "#bb2200" "#00ccee" "#ff0000" "#ffff00" "#ffffff"
#   "#ff00ff" "#00ff00" "#0000cc" "#aaaa00" "#aaccaa"
#   "#ff7777" "#bfff81" "#00ffcc" "#ce0097" "#d2d46b"
#   "#ef6158" "#fdb200" }

###########################################################################
#### CAIRO STUFF
###########################################################################
#### Scale all fonts by this number
# set cairo_font_scale 1.0

#### default for following two is 0.85 (xscale) and 0.88 (yscale) to 
#### match cairo font spacing
# set nocairo_font_xscale 1.0
#### set nocairo_font_yscale 1.0

#### Scale line spacing by this number
# set cairo_font_line_spacing 1.0

#### Specify a font
# set cairo_font_name {Sans-Serif}
# set svg_font_name {Sans-Serif}

#### Lift up text by some zoom-corrected pixels for
#### better compatibility wrt no cairo version.
#### Useful values in the range [-1, 3]
# set cairo_vert_correct 0
# set nocairo_vert_correct 0

###########################################################################
#### KEYBINDINGS
###########################################################################
#### General format for specifying a replacement for a keybind
#### Replace Ctrl-q with Escape (so you wont kill the program)
# set replace_key(Control-q) Escape

#### swap w and W keybinds; Always specify Shift for capital letters
# set replace_key(Shift-W) Key-w
# set replace_key(Key-w) Shift-W

###########################################################################
#### TERMINAL
###########################################################################
#### default for linux: xterm
# set terminal {xterm -geometry 100x35 -fn 9x15 -bg black -fg white -cr white -ms white }
#### lxterminal is not OK since it will not inherit env vars: 
#### In order to reduce memory usage and increase the performance, all instances
#### of the lxterminal are sharing a single process. LXTerminal is part of LXDE

###########################################################################
#### EDITOR
###########################################################################
#### editor must not detach from launching shell (-f mandatory for gvim)
#### default for linux: gvim -f
# set editor {gvim -f -geometry 90x28}
# set editor { xterm -geometry 100x40 -e nano }
# set editor { xterm -geometry 100x40 -e pico }

#### For Windows
# set editor {notepad.exe}

###########################################################################
#### SHOW ERC INFO WINDOW (erc errors, warnings etc)
###########################################################################
#### default: 0 (can be enabled by menu)
# set show_infowindow 0

###########################################################################
#### ALWAYS SHOW ERC INFO WINDOW AFTER NETLIST
###########################################################################
#### default: 0 
# set show_infowindow_after_netlist 0

###########################################################################
#### TCP CONNECTION WITH GAW
###########################################################################
#### set gaw address for socket connection: {host port}
#### default: set to localhost, port 2020
# set gaw_tcp_address {localhost 2020}

###########################################################################
#### XSCHEM LISTEN TO TCP PORT
###########################################################################
#### set xschem listening port; default: not enabled
# set xschem_listen_port 2021

###########################################################################
#### BESPICE WAVE SOCKET CONNECTION
###########################################################################
#### set bespice wave listening port; default: not enabled
set bespice_listen_port 2022

###########################################################################
#### TCL FILES TO LOAD AT STARTUP
###########################################################################
#### list of tcl files to preload.
set tcl_files {}
# lappend tcl_files ${XSCHEM_SHAREDIR}/ngspice_backannotate.tcl
# lappend tcl_files ${XSCHEM_SHAREDIR}/change_index.tcl
# lappend tcl_files ....

###########################################################################
#### WEB URL DOWNLOAD HELPER APPLICATION
###########################################################################
#### used to download files from web: default: {curl -f -s -O -J}
# set download_url_helper {curl -f -s -O -J}
# set download_url_helper {wget -N --quiet --content-disposition}

###########################################################################
#### XSCHEM TOOLBAR
###########################################################################
#### default: not enabled.
set toolbar_visible 1
# set toolbar_horiz   1

###########################################################################
#### TABBED WINDOWS
###########################################################################
# default: not enabled. Interface can be changed runtime if only one window 
# or tab is open.
set tabbed_interface 1

###########################################################################
#### CASE INSENSITIVE SYMBOL LOOKUP
###########################################################################
## this option might be useful on filesystems that are case insensitive and
## on designs ported from windows where case of file names does not matter.
## if this option is set symbol lookup will be case insensitive,
## so a symbol reference 'AMPLI.SYM' will match with 'ampli.sym' or
## Amply.sym on disk. File system must be case insensitive for this to work,
## like FAT32 or NTFS.
## Do not set this option if you don't know what you are doing.
## Default: not enabled (0)
# set case_insensitive 1

###########################################################################
#### HIDE GRAPHS IF NO SPICE DATA LOADED
###########################################################################
## if enabled graphs will be hidden if no data is loaded.
## default: not enabled (0)
# set hide_empty_graphs 0

###########################################################################
#### SHOW HIDDEN TEXTS
###########################################################################
## This option shows text objects even if they have attribute 'hide=true' set
## default: 0 (not set) 
# set show_hidden_texts 1

###########################################################################
#### USE CTRL MODIFIER TO OPERATE ON GRAPHS WITH MOUSE & KEYBOARD
###########################################################################
#### if enabled forces to hold Control key pressed to operate on graphs
#### to prevent "graph event stealing to schematic"
#### Default: 0 (not set)
# set graph_use_ctrl_key 1

###########################################################################
#### LIVE BACKANNOTATION OF DATA AT CURSOR 2 (B) POSITION
###########################################################################
## if enabled will backannotate values in schematic at cursor 'b' position
## in graph. Default: enabled (1)
set live_cursor2_backannotate 1

###########################################################################
#### SKYWATER PDK SPECIFIC VARIABLES
###########################################################################

## check if env var PDK_ROOT exists, and use it for building open_pdks paths
if { [info exists env(PDK_ROOT)] && $env(PDK_ROOT) ne {} } {
  ## found variable, set tcl PDK_ROOT var
  if {![file isdir $env(PDK_ROOT)]} {
    puts stderr "Warning: PDK_ROOT environment variable is set but path not found on the system."
  }
  set PDK_ROOT $env(PDK_ROOT)
} else {
  ## not existing or empty. 
  puts stderr "Warning: PDK_ROOT env. var. not found or empty, trying to find an open_pdks install"
  if {[file isdir /usr/share/pdk]} {set PDK_ROOT /usr/share/pdk
  } elseif {[file isdir /usr/local/share/pdk]} {set PDK_ROOT /usr/local/share/pdk
  } elseif {[file isdir $env(HOME)/share/pdk]} {set PDK_ROOT $env(HOME)/share/pdk
  } else {
    puts stderr {No open_pdks installation found, set PDK_ROOT env. var. and restart xschem}
  }
}

if {[info exists PDK_ROOT]} {
  ## get process variant
  if {[info exists env(PDK)]} {
    set PDK $env(PDK)
  } else {
    set PDK sky130A
  }
  # set SKYWATER_MODELS ${PDK_ROOT}/${PDK}/libs.tech/ngspice
  set SKYWATER_MODELS ${PDK_ROOT}/${PDK}/libs.tech/combined
  set SKYWATER_STDCELLS ${PDK_ROOT}/${PDK}/libs.ref/sky130_fd_sc_hd/spice
  puts stderr "open_pdks installation: using $PDK_ROOT"
  puts stderr "SKYWATER_MODELS: $SKYWATER_MODELS"
  puts stderr "SKYWATER_STDCELLS: $SKYWATER_STDCELLS"
}

# sky130 mosfets dimension checks
proc fet_drc {instance symbol model w l {nf 1}} {
  set res {}
  # puts "$instance $model $symbol w=$w l=$l nf=$nf"
  if { [string is double $w] && [string is double $l] && [string is integer $nf]} {
    # not *_nf.sym devices: get single finger width
    if {![regexp {fet.*_nf\.sym$} $symbol]} {
      set w [expr { double($w) / double($nf)}]
    }
    switch -regexp $model {
      {[np]fet_01v8$} {
        if { $w < 0.42 } {
          append res "${instance} ($model): finger width is too small, w / nf = $w" \n
        }
        if { $l < 0.15 } {
          append res "${instance} ($model): length is too small, l = $l" \n
        }
      }
      {pfet_01v8_lvt$} {
        if { $w < 0.42 } {
          append res "${instance} ($model): finger width is too small, w / nf = $w" \n
        }
        if { $l < 0.35 } {
          append res "${instance} ($model): length is too small, l = $l" \n
        }
      }
      {nfet_01v8_lvt$} {
        if { $w < 0.42 } {
          append res "${instance} ($model): finger width is too small, w / nf = $w" \n
        }
        if { $l < 0.15 } {
          append res "${instance} ($model): length is too small, l = $l" \n
        }
      }
      {[np]fet_g5v0d10v5$} {
        if { $w < 0.42 } {
          append res "${instance} ($model): finger width is too small, w / nf = $w" \n
        }
        if { $l < 0.5 } {
          append res "${instance} ($model): length is too small, l = $l" \n
        }
      }
      {pfet_g5v0d16v0$} {
        if { $w < 5 } {
          append res "${instance} ($model): finger width is too small, w / nf = $w" \n
        }
        if { $l < 0.66 } {
          append res "${instance} ($model): length is too small, l = $l" \n
        }
      }
      {nfet_g5v0d16v0$} {
        if { $w < 5 } {
          append res "${instance} ($model): finger width is too small, w / nf = $w" \n
        }
        if { $l < 0.7 } {
          append res "${instance} ($model): length is too small, l = $l" \n
        }
      }
    } ;# switch
  }
  return $res
}