5.2. Create H-Tree Connectivity pattern

This example demonstrate how to genrate different connection pattern for routing global signals. By default this library support basic fishbone and HTree patterns, which can be extended to create desired connectivity usng transformations like rotate, transalate, margin, merge, scale and sample

Output

from spydrnet_physical.util import ConnectionPattern

WIDTH = 33
WIDTH_F = 33
HEIGHT = 33
p_manager = ConnectionPattern(WIDTH, HEIGHT)
htree_pattern = p_manager.connections
htree_pattern.cursor = (int(WIDTH/2)+1, 0)
htree_pattern.move_y(steps=int(WIDTH/2)+1)
htree_pattern.merge(p_manager.get_htree(WIDTH))

while WIDTH > 6:
    for x in range(int(WIDTH/4)+1, WIDTH_F, int(WIDTH/2)):
        for y in range(int(WIDTH/4)+1, WIDTH_F, int(WIDTH/2)):
            htree_pattern.merge(p_manager.get_htree(
                int(WIDTH/2)).translate(x-int(WIDTH/4), y-int(WIDTH/4)))
    WIDTH = int(WIDTH/2)+1

svg = p_manager.render_pattern(title="HTree Pattern")

# Highlight the clock sink point
for y in range(2, WIDTH_F, 2):
    for x in range(2, WIDTH_F, 2):
        p_manager.svg_main.add(svg.rect(
            color="red", opacity="0.1",
            insert=(x*20 - 10, y*20 - 10),
            size=(20, 20)))
svg.saveas("_htree_pattern.svg", pretty=True, indent=4)