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Add example timing tree. 

Signed-off-by: Keith Rothman <537074+litghost@users.noreply.github.com>
This commit is contained in:
Keith Rothman 2019-05-07 12:12:36 -07:00
parent 64798087b1
commit b14952e1da
1 changed files with 28 additions and 0 deletions
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prjxray/timing.py
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@ -28,6 +28,34 @@ and inpins are leafs of the elmore tree. Wires and pass-transistor switches are
nodes in the tree. Wires share their capacitance upstream and downstream using nodes in the tree. Wires share their capacitance upstream and downstream using
a pi-model. a pi-model.
Example timing tree:
+------+
|Outpin|
+--+---+
|
|
v
+--+--+
|Wire |
+--+--+
|
+-----------------+
| |
+--+---+ +-------+------+
|Buffer| |PassTransistor|
+--+---+ +------+-------+
| |
v v
+--+-+ +--+-+
|Wire| |Wire|
+--+-+ +--+-+
| |
v v
+--+--+ +--+--+
|Inpin| |Inpin|
+-----+ +-----+
""" """
import enum import enum
from collections import namedtuple from collections import namedtuple