Merge pull request #1220 from Pinata-Consulting/mock-array-route-by-abutment

Mock array route by abutment

Author: maliberty

flow/designs/asap7/mock-array/config.mk

@@ -51,3 +51,6 @@ export DETAILED_ROUTE_ARGS   = -bottom_routing_layer M2 -top_routing_layer M7 -s
 # same information to other stages in the flow.
 export MIN_ROUTING_LAYER = M2
 export MAX_ROUTING_LAYER = M7
+
+# works with 28 or more iterations as of writing, so give it a few more.
+export GLOBAL_ROUTE_ARGS=-congestion_iterations 40 -verbose

flow/designs/asap7/mock-array/constraints.sdc

@@ -13,3 +13,5 @@ set non_clock_inputs [lsearch -inline -all -not -exact [all_inputs] $clk_port]
 
 set_input_delay  [expr $clk_period * $clk_io_pct] -clock $clk_name $non_clock_inputs 
 set_output_delay [expr $clk_period * $clk_io_pct] -clock $clk_name [all_outputs]
+
+set_dont_touch [get_nets ces_*_*]

flow/designs/asap7/mock-array/defaults.mk

@@ -3,12 +3,12 @@
 # current unit is configured as 2.16 which is on the routing grid for M5
 
 # table of Elements - (rows cols width height pitch_x pitch_y)
-export MOCK_ARRAY_TABLE         ?= 8 8 20 20 25 25
+export MOCK_ARRAY_TABLE         ?= 8 8 20 20 20 22
 
 # Element'd data width
 export MOCK_ARRAY_DATAWIDTH     ?= 64
 
 # Must be zero for routing by abutment
-export MACRO_BLOCKAGE_HALO      ?= 0.5
+export MACRO_BLOCKAGE_HALO      ?= 0
 
 export MOCK_ARRAY_SCALE         ?= 45

flow/designs/asap7/mock-array/macro-placement.tcl

@@ -9,8 +9,16 @@ for {set row 0} {$row < $rows} {incr row} {
   for {set col 0} {$col < $cols} {incr col} {
     set inst [$block findInst [format "ces_%d_%d" $row $col]]
 
-    set x [expr int((($array_offset_x + (($placement_grid_x * $pitch_x) * $col)) * $units))]
-    set y [expr int((($array_offset_y + (($placement_grid_y * $pitch_y) * $row)) * $units))]
+    set x [expr round((($array_offset_x + (($placement_grid_x * $pitch_x) * $col)) * $units))]
+    set y [expr round((($array_offset_y + (($placement_grid_y * $pitch_y) * $row)) * $units))]
+
+    # belt and suspenders check... ASAP7 macro placement must be aligned to 0.048um
+    if {$x % 48 != 0} {
+        error "x=$x is not divisible by 48"
+    }
+    if {$y % 48 != 0} {
+        error "y=$y is not divisible by 48"
+    }
 
     $inst setOrient R0
     $inst setOrigin $x $y