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Finish new VCG testing. 

Reversed VCG graph edge directions.
Channel tracks get added left to right or top down like
normal left edge algorithm examples.
This commit is contained in:
Matt Guthaus 2018-09-11 13:43:47 -07:00
parent fcc4a75295
commit 5e34233479
2 changed files with 23 additions and 33 deletions
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50
compiler/base/hierarchy_layout.py
View File

@ -721,8 +721,6 @@ class layout(lef.lef):
try to minimize the number of tracks -- instead, it picks an order to avoid the vertical try to minimize the number of tracks -- instead, it picks an order to avoid the vertical
conflicts between pins. conflicts between pins.
""" """
local_debug = True
def remove_net_from_graph(pin, g): def remove_net_from_graph(pin, g):
# Remove the pin from the keys # Remove the pin from the keys
g.pop(pin,None) g.pop(pin,None)
@ -747,11 +745,11 @@ class layout(lef.lef):
def vcg_pin_overlap(pin1, pin2, vertical): def vcg_pin_overlap(pin1, pin2, vertical):
# Check for vertical overlap of the two pins # Check for vertical overlap of the two pins
# Pin 1 must be in the "LEFT" set and overlap the right # Pin 1 must be in the "TOP" set
x_overlap = pin1.lx() < pin2.lx() and abs(pin1.center().x-pin2.center().x)<pitch x_overlap = pin1.by() > pin2.by() and abs(pin1.center().x-pin2.center().x)<pitch
# Pin 1 must be in the "TOP" set and overlap the bottom # Pin 1 must be in the "LET" set
y_overlap = pin1.by() > pin2.by() and abs(pin1.center().y-pin2.center().y)<pitch y_overlap = pin1.lx() < pin2.lx() and abs(pin1.center().y-pin2.center().y)<pitch
return (not vertical and x_overlap) or (vertical and y_overlap) return (not vertical and x_overlap) or (vertical and y_overlap)
@ -773,50 +771,42 @@ class layout(lef.lef):
# Create names for the nets for the graphs # Create names for the nets for the graphs
nets = {} nets = {}
index = 0 index = 0
print(route_map) #print(route_map)
for pin_connections in route_map: for pin_connections in route_map:
net_name = "n{}".format(index) net_name = "n{}".format(index)
print("N",net_name)
index += 1 index += 1
nets[net_name] = [] nets[net_name] = []
for pin_name in pin_connections: for pin_name in pin_connections:
pin = all_pins[pin_name] pin = all_pins[pin_name]
nets[net_name].append(pin) nets[net_name].append(pin)
if local_debug:
import pprint
pprint.pprint(nets)
# Find the vertical pin conflicts # Find the vertical pin conflicts
# FIXME: O(n^2) but who cares for now # FIXME: O(n^2) but who cares for now
for net_name1 in nets: for net_name1 in nets:
print("NET1:",net_name1)
vcg[net_name1]=[] vcg[net_name1]=[]
for net_name2 in nets: for net_name2 in nets:
print("NET2:",net_name2)
# Skip yourself # Skip yourself
if net_name1 == net_name2: if net_name1 == net_name2:
continue continue
if vcg_pins_overlap(nets[net_name1], nets[net_name2], vertical): if vcg_pins_overlap(nets[net_name1], nets[net_name2], vertical):
try: try:
vcg[net_name1].append(net_name2) vcg[net_name2].append(net_name1)
except: except:
vcg[net_name1] = [net_name2] vcg[net_name2] = [net_name1]
#FIXME: What if we have a cycle? #FIXME: What if we have a cycle?
# This is the starting offset of the first trunk # The starting offset is the first trunk at the top or left
if vertical: # so we must offset from the lower left of the channel placement
half_minwidth = 0.5*drc["minwidth_{}".format(layer_stack[2])] # in the case of vertical tracks
offset = offset + vector(half_minwidth,0) if not vertical:
else: # This will start from top down
half_minwidth = 0.5*drc["minwidth_{}".format(layer_stack[0])] offset = offset + vector(0,len(nets)*pitch)
offset = offset + vector(0,half_minwidth)
# list of routes to do # list of routes to do
while vcg: while vcg:
if local_debug: #from pprint import pformat
from pprint import pformat #print("VCG:\n",pformat(vcg))
print("VCG:\n",pformat(vcg))
# get a route from conflict graph with empty fanout set # get a route from conflict graph with empty fanout set
net_name=None net_name=None
for net_name,conflicts in vcg.items(): for net_name,conflicts in vcg.items():
@ -827,22 +817,22 @@ class layout(lef.lef):
# FIXME: We don't support cyclic VCGs right now. # FIXME: We don't support cyclic VCGs right now.
debug.error("Cyclic VCG in channel router.",-1) debug.error("Cyclic VCG in channel router.",-1)
if local_debug:
print("Routing:",net_name,pin_connections)
# These are the pins we'll have to connect # These are the pins we'll have to connect
pin_list = nets[net_name] pin_list = nets[net_name]
#print("Routing:",net_name,[x.name for x in pin_list])
# Remove the net from other constriants in the VCG # Remove the net from other constriants in the VCG
vcg=remove_net_from_graph(net_name, vcg) vcg=remove_net_from_graph(net_name, vcg)
# Add the trunk route and move up to next track # Add the trunk routes from the bottom up or right to left
if vertical: if vertical:
self.add_vertical_trunk_route(pin_list, offset, layer_stack, pitch) self.add_vertical_trunk_route(pin_list, offset, layer_stack, pitch)
offset += vector(pitch,0) offset -= vector(pitch,0)
else: else:
self.add_horizontal_trunk_route(pin_list, offset, layer_stack, pitch) self.add_horizontal_trunk_route(pin_list, offset, layer_stack, pitch)
offset += vector(0,pitch) offset -= vector(0,pitch)
def create_vertical_channel_route(self, route_map, left_inst, right_inst, offset, def create_vertical_channel_route(self, route_map, left_inst, right_inst, offset,

4
compiler/tests/20_sram_1bank_test.py
View File

@ -23,8 +23,8 @@ class sram_1bank_test(openram_test):
c.words_per_row=1 c.words_per_row=1
debug.info(1, "Single bank, no column mux with control logic") debug.info(1, "Single bank, no column mux with control logic")
#a = sram(c, "sram1") a = sram(c, "sram1")
#self.local_check(a, final_verification=True) self.local_check(a, final_verification=True)
c.num_words=32 c.num_words=32
c.words_per_row=2 c.words_per_row=2