Merge pull request #934 from Pinata-Consulting/fix-io-alignment-2

Fix io alignment for mock-array-big

Author: maliberty

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

@@ -6,7 +6,7 @@ export SDC_FILE      = designs/asap7/mock-array-big/constraints.sdc
 
 export PLATFORM               = asap7
 
-export PLACE_DENSITY          = 0.40
+export PLACE_DENSITY          = 0.50
 export CORE_AREA = $(shell python3 designs/asap7/mock-array-big/ce_core_area.py)
 export DIE_AREA = $(shell python3 designs/asap7/mock-array-big/ce_die_area.py)
 

flow/designs/asap7/mock-array-big/ce_core_area.py

@@ -1,3 +1,5 @@
 import config
 
-print(f'1 1 {config.element_width - 1} {config.element_height - 1}')
+margin = config.routing_pitch * 10
+
+print(f'{margin} {margin} {config.pitch - margin} {config.pitch - margin}')

flow/designs/asap7/mock-array-big/ce_die_area.py

@@ -1,3 +1,3 @@
 import config
 
-print(f'0 0 {config.element_width} {config.element_height}')
+print(f'0 0 {config.pitch} {config.pitch}')

flow/designs/asap7/mock-array-big/config.py

@@ -3,23 +3,25 @@
 
 rows = int(os.environ.get("MOCK_ARRAY_HEIGHT", "8"))
 cols = int(os.environ.get("MOCK_ARRAY_WIDTH", "8"))
-pitch_scale = int(os.environ.get("MOCK_ARRAY_PITCH_SCALE", "10"))
+pitch_scale = int(os.environ.get("MOCK_ARRAY_PITCH_SCALE", "2"))
 
+# Routing pitches for relevant metal layers.
+#  For x, this is M5; for y, this is M4.
+#  Pitches are specified in OpenROAD-flow-scripts/flow/platforms/asap7/lef/asap7_tech_1x_201209.lef.
+#  For asap7, x and y pitch is the same.
+routing_pitch = 0.048
 
-# from platforms/asap7/openRoad/make_tracks.tcl, smallest common x_pitch and y_pitch
-# denominator
-lowest_common_grid_denominator = 0.576
+# 0.048 * 125 = 6, which is a nice round number to work with
+pitch = routing_pitch * 125 * pitch_scale
+margin = routing_pitch * 125 * 2
+core_offset_x = margin
+core_offset_y = margin
+die_offset_x = core_offset_x + margin
+die_offset_y = core_offset_y + margin
 
-power_x_pitch = 4 * lowest_common_grid_denominator
-power_y_pitch = 4 * lowest_common_grid_denominator
-y_pitch = (power_y_pitch * pitch_scale)
-x_pitch = (power_x_pitch * pitch_scale)
-offset_x = power_x_pitch * 4
-offset_y = power_y_pitch * 4
-margin = 4 * lowest_common_grid_denominator
+pitch_and_margin = pitch + margin
 
-element_width = x_pitch - power_x_pitch * 4
-element_height = y_pitch - power_y_pitch * 4
-
-height = rows * y_pitch + offset_y
-width = cols * x_pitch + offset_x
+core_width = cols * pitch_and_margin + core_offset_x
+core_height = rows * pitch_and_margin + core_offset_y
+die_width = core_width + margin * 2
+die_height = core_height + margin * 2

flow/designs/asap7/mock-array-big/core_area.py

@@ -1,6 +1,6 @@
 import config
 
-x = config.margin
-y = config.margin
+x = config.core_offset_x
+y = config.core_offset_y
 
-print(f'{y} {x} {x+config.width} {y+config.height}')
+print(f'{x} {y} {x+config.core_width} {y+config.core_height}')

flow/designs/asap7/mock-array-big/die_area.py

@@ -1,3 +1,3 @@
 import config
 
-print(f'0 0 {config.width + 2*config.margin} {config.height + 2*config.margin}')
+print(f'0 0 {config.die_width} {config.die_height}')

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

@@ -1,6 +1,6 @@
 # fish out values from single source of truth: config.py
-set vals [regexp -all -inline {\S+} [exec sh -c {cd designs/asap7/mock-array-big && python3 -c "import config;print(f'{config.rows} {config.cols} {config.x_pitch} {config.offset_x} {config.y_pitch} {config.offset_y}')"}]]
-lassign $vals rows cols x_pitch offset_x y_pitch offset_y
+set vals [regexp -all -inline {\S+} [exec sh -c {cd designs/asap7/mock-array-big && python3 -c "import config;print(f'{config.rows} {config.cols} {config.pitch_and_margin} {config.die_offset_x} {config.die_offset_y}')"}]]
+lassign $vals rows cols pitch_and_margin die_offset_x die_offset_y
 
 set block [ord::get_db_block]
 set units [$block getDefUnits]
@@ -9,10 +9,10 @@ for {set row 0} {$row < $rows} {incr row} {
   for {set col 0} {$col < $cols} {incr col} {
     set inst [$block findInst [format "ces_%d_%d" $row $col]]
     $inst setOrient R0
-    set x [expr round([expr {$offset_x + $col * $x_pitch}] * $units)]
-    set y [expr round([expr {$offset_y + $row * $y_pitch}] * $units)]
+    set x [expr round([expr {$die_offset_x + $col * $pitch_and_margin}] * $units)]
+    set y [expr round([expr {$die_offset_y + $row * $pitch_and_margin}] * $units)]
 
-    $inst setOrigin $x $y 
+    $inst setOrigin $x $y
     $inst setPlacementStatus FIRM
   }
 }