Python Script Diagramming Packages¶
Several Python packages support diagram generation from simple textual diagram definition scripts.
Rendering SVG Schematic Diagrams from a yosys JSON netlist¶
The netlistsvg package can generate and render an SVG schematic diagram from a netlist.
JSON Source (click here to reveal)
{
"modules": {
"up3down5": {
"ports": {
"clock": {
"direction": "input",
"bits": [ 2 ]
},
"data_in": {
"direction": "input",
"bits": [ 3, 4, 5, 6, 7, 8, 9, 10, 11 ]
},
"up": {
"direction": "input",
"bits": [ 12 ]
},
"down": {
"direction": "input",
"bits": [ 13 ]
},
"carry_out": {
"direction": "output",
"bits": [ 14 ]
},
"borrow_out": {
"direction": "output",
"bits": [ 15 ]
},
"count_out": {
"direction": "output",
"bits": [ 16, 17, 18, 19, 20, 21, 22, 23, 24 ]
},
"parity_out": {
"direction": "output",
"bits": [ 25 ]
}
},
"cells": {
"$add$input.v:17$3": {
"type": "$add",
"port_directions": {
"A": "input",
"B": "input",
"Y": "output"
},
"connections": {
"A": [ 16, 17, 18, 19, 20, 21, 22, 23, 24 ],
"B": [ "1", "1" ],
"Y": [ 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 ]
}
},
"$and$input.v:28$5": {
"type": "$and",
"port_directions": {
"A": "input",
"B": "input",
"Y": "output"
},
"connections": {
"A": [ 12 ],
"B": [ 35 ],
"Y": [ 36 ]
}
},
"$and$input.v:29$6": {
"type": "$and",
"port_directions": {
"A": "input",
"B": "input",
"Y": "output"
},
"connections": {
"A": [ 13 ],
"B": [ 37 ],
"Y": [ 38 ]
}
},
"$procdff$40": {
"type": "$dff",
"port_directions": {
"CLK": "input",
"D": "input",
"Q": "output"
},
"connections": {
"CLK": [ 2 ],
"D": [ 39, 40, 41, 42, 43, 44, 45, 46, 47 ],
"Q": [ 16, 17, 18, 19, 20, 21, 22, 23, 24 ]
}
},
"$procdff$41": {
"type": "$dff",
"port_directions": {
"CLK": "input",
"D": "input",
"Q": "output"
},
"connections": {
"CLK": [ 2 ],
"D": [ 36 ],
"Q": [ 14 ]
}
},
"$procdff$42": {
"type": "$dff",
"port_directions": {
"CLK": "input",
"D": "input",
"Q": "output"
},
"connections": {
"CLK": [ 2 ],
"D": [ 38 ],
"Q": [ 15 ]
}
},
"$procdff$43": {
"type": "$dff",
"port_directions": {
"CLK": "input",
"D": "input",
"Q": "output"
},
"connections": {
"CLK": [ 2 ],
"D": [ 48 ],
"Q": [ 25 ]
}
},
"$procmux$36": {
"type": "$pmux",
"port_directions": {
"A": "input",
"B": "input",
"S": "input",
"Y": "output"
},
"connections": {
"A": [ 16, 17, 18, 19, 20, 21, 22, 23, 24 ],
"B": [ 26, 27, 28, 29, 30, 31, 32, 33, 34, 49, 50, 51, 52, 53, 54, 55, 56, 57, 3, 4, 5, 6, 7, 8, 9, 10, 11 ],
"S": [ 58, 59, 60 ],
"Y": [ 39, 40, 41, 42, 43, 44, 45, 46, 47 ]
}
},
"$procmux$37_CMP0": {
"type": "$eq",
"port_directions": {
"A": "input",
"B": "input",
"Y": "output"
},
"connections": {
"A": [ 13, 12 ],
"B": [ "0", "1" ],
"Y": [ 58 ]
}
},
"$procmux$38_CMP0": {
"type": "$eq",
"port_directions": {
"A": "input",
"B": "input",
"Y": "output"
},
"connections": {
"A": [ 13, 12 ],
"B": [ "1", "0" ],
"Y": [ 59 ]
}
},
"$procmux$39_CMP0": {
"type": "$eq",
"port_directions": {
"A": "input",
"B": "input",
"Y": "output"
},
"connections": {
"A": [ 13, 12 ],
"B": [ "0", "0" ],
"Y": [ 60 ]
}
},
"$reduce_xor$input.v:27$4": {
"type": "$reduce_xor",
"port_directions": {
"A": "input",
"Y": "output"
},
"connections": {
"A": [ 39, 40, 41, 42, 43, 44, 45, 46, 47 ],
"Y": [ 48 ]
}
},
"$sub$input.v:16$2": {
"type": "$sub",
"port_directions": {
"A": "input",
"B": "input",
"Y": "output"
},
"connections": {
"A": [ 16, 17, 18, 19, 20, 21, 22, 23, 24 ],
"B": [ "1", "0", "1" ],
"Y": [ 49, 50, 51, 52, 53, 54, 55, 56, 57, 37 ]
}
}
}
}
}
}
netlist = {
"modules": {
"up3down5": {
"ports": {
"clock": {
"direction": "input",
"bits": [ 2 ]
},
"data_in": {
"direction": "input",
"bits": [ 3, 4, 5, 6, 7, 8, 9, 10, 11 ]
},
"up": {
"direction": "input",
"bits": [ 12 ]
},
"down": {
"direction": "input",
"bits": [ 13 ]
},
"carry_out": {
"direction": "output",
"bits": [ 14 ]
},
"borrow_out": {
"direction": "output",
"bits": [ 15 ]
},
"count_out": {
"direction": "output",
"bits": [ 16, 17, 18, 19, 20, 21, 22, 23, 24 ]
},
"parity_out": {
"direction": "output",
"bits": [ 25 ]
}
},
"cells": {
"$add$input.v:17$3": {
"type": "$add",
"port_directions": {
"A": "input",
"B": "input",
"Y": "output"
},
"connections": {
"A": [ 16, 17, 18, 19, 20, 21, 22, 23, 24 ],
"B": [ "1", "1" ],
"Y": [ 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 ]
}
},
"$and$input.v:28$5": {
"type": "$and",
"port_directions": {
"A": "input",
"B": "input",
"Y": "output"
},
"connections": {
"A": [ 12 ],
"B": [ 35 ],
"Y": [ 36 ]
}
},
"$and$input.v:29$6": {
"type": "$and",
"port_directions": {
"A": "input",
"B": "input",
"Y": "output"
},
"connections": {
"A": [ 13 ],
"B": [ 37 ],
"Y": [ 38 ]
}
},
"$procdff$40": {
"type": "$dff",
"port_directions": {
"CLK": "input",
"D": "input",
"Q": "output"
},
"connections": {
"CLK": [ 2 ],
"D": [ 39, 40, 41, 42, 43, 44, 45, 46, 47 ],
"Q": [ 16, 17, 18, 19, 20, 21, 22, 23, 24 ]
}
},
"$procdff$41": {
"type": "$dff",
"port_directions": {
"CLK": "input",
"D": "input",
"Q": "output"
},
"connections": {
"CLK": [ 2 ],
"D": [ 36 ],
"Q": [ 14 ]
}
},
"$procdff$42": {
"type": "$dff",
"port_directions": {
"CLK": "input",
"D": "input",
"Q": "output"
},
"connections": {
"CLK": [ 2 ],
"D": [ 38 ],
"Q": [ 15 ]
}
},
"$procdff$43": {
"type": "$dff",
"port_directions": {
"CLK": "input",
"D": "input",
"Q": "output"
},
"connections": {
"CLK": [ 2 ],
"D": [ 48 ],
"Q": [ 25 ]
}
},
"$procmux$36": {
"type": "$pmux",
"port_directions": {
"A": "input",
"B": "input",
"S": "input",
"Y": "output"
},
"connections": {
"A": [ 16, 17, 18, 19, 20, 21, 22, 23, 24 ],
"B": [ 26, 27, 28, 29, 30, 31, 32, 33, 34, 49, 50, 51, 52, 53, 54, 55, 56, 57, 3, 4, 5, 6, 7, 8, 9, 10, 11 ],
"S": [ 58, 59, 60 ],
"Y": [ 39, 40, 41, 42, 43, 44, 45, 46, 47 ]
}
},
"$procmux$37_CMP0": {
"type": "$eq",
"port_directions": {
"A": "input",
"B": "input",
"Y": "output"
},
"connections": {
"A": [ 13, 12 ],
"B": [ "0", "1" ],
"Y": [ 58 ]
}
},
"$procmux$38_CMP0": {
"type": "$eq",
"port_directions": {
"A": "input",
"B": "input",
"Y": "output"
},
"connections": {
"A": [ 13, 12 ],
"B": [ "1", "0" ],
"Y": [ 59 ]
}
},
"$procmux$39_CMP0": {
"type": "$eq",
"port_directions": {
"A": "input",
"B": "input",
"Y": "output"
},
"connections": {
"A": [ 13, 12 ],
"B": [ "0", "0" ],
"Y": [ 60 ]
}
},
"$reduce_xor$input.v:27$4": {
"type": "$reduce_xor",
"port_directions": {
"A": "input",
"Y": "output"
},
"connections": {
"A": [ 39, 40, 41, 42, 43, 44, 45, 46, 47 ],
"Y": [ 48 ]
}
},
"$sub$input.v:16$2": {
"type": "$sub",
"port_directions": {
"A": "input",
"B": "input",
"Y": "output"
},
"connections": {
"A": [ 16, 17, 18, 19, 20, 21, 22, 23, 24 ],
"B": [ "1", "0", "1" ],
"Y": [ 49, 50, 51, 52, 53, 54, 55, 56, 57, 37 ]
}
}
}
}
}
}
import json
fn = 'netlist.json'
with open(fn, 'w') as f:
json.dump(netlist, f)
%%capture
fn_svg = "netlist.svg"
# Install the netlistsvg package (requires node)
#!npm install -g netlistsvg
!netlistsvg $fn -o $fn_svg
from IPython.display import SVG
SVG(fn_svg)
