Add logo & shuttle ID as chip art

cfg/sky130.yaml

@@ -106,3 +106,5 @@ tt:
         9:  1192120
         10:  976120
         11:  760120
+  logo:
+    size: 100000

formal/tt_connectivity.sby

@@ -8,7 +8,7 @@ smtbmc
 
 [script]
 read -noverific
-read -sv tt_formal.v tt_top.v tt_mux.v tt_ctrl.v tt_prim_buf.v tt_prim_dfrbp.v tt_prim_diode.v tt_prim_inv.v tt_prim_mux2.v tt_prim_mux4.v tt_prim_tbuf_pol.v tt_prim_tbuf.v tt_prim_tie.v tt_prim_zbuf.v tt_um_formal.v tt_user_module_connectivity.v
+read -sv -noblackbox tt_formal.v tt_top.v tt_mux.v tt_ctrl.v tt_logo_top.v tt_logo_bottom.v tt_prim_buf.v tt_prim_dfrbp.v tt_prim_diode.v tt_prim_inv.v tt_prim_mux2.v tt_prim_mux4.v tt_prim_tbuf_pol.v tt_prim_tbuf.v tt_prim_tie.v tt_prim_zbuf.v tt_um_formal.v tt_user_module_connectivity.v
 
 # convert tribuf to logic
 prep -top tt_formal; flatten; tribuf -logic
@@ -19,6 +19,8 @@ tt_formal.v
 ../rtl/tt_top.v
 ../rtl/tt_mux.v
 ../rtl/tt_ctrl.v
+../rtl/tt_logo_top.v
+../rtl/tt_logo_bottom.v
 ../rtl/prim_generic/tt_prim_buf.v
 ../rtl/prim_generic/tt_prim_dfrbp.v
 ../rtl/prim_generic/tt_prim_diode.v

formal/tt_tristate.sby

@@ -7,7 +7,7 @@ depth 10
 smtbmc
 
 [script]
-read -sv -noblackbox tt_top.v tt_mux.v tt_ctrl.v tt_prim_buf.v tt_prim_dfrbp.v tt_prim_diode.v tt_prim_inv.v tt_prim_mux2.v tt_prim_mux4.v tt_prim_tbuf_pol.v tt_prim_tbuf.v tt_prim_tie.v tt_prim_zbuf.v tt_um_test.v tt_user_module_tristate.v
+read -sv -noblackbox tt_top.v tt_mux.v tt_ctrl.v tt_logo_top.v tt_logo_bottom.v tt_prim_buf.v tt_prim_dfrbp.v tt_prim_diode.v tt_prim_inv.v tt_prim_mux2.v tt_prim_mux4.v tt_prim_tbuf_pol.v tt_prim_tbuf.v tt_prim_tie.v tt_prim_zbuf.v tt_um_test.v tt_user_module_tristate.v
 
 prep -top tt_top
 
@@ -19,6 +19,8 @@ flatten; tribuf -formal
 ../rtl/tt_top.v
 ../rtl/tt_mux.v
 ../rtl/tt_ctrl.v
+../rtl/tt_logo_top.v
+../rtl/tt_logo_bottom.v
 ../rtl/prim_generic/tt_prim_buf.v
 ../rtl/prim_generic/tt_prim_dfrbp.v
 ../rtl/prim_generic/tt_prim_diode.v

ol2/tt_top/build.py

@@ -129,7 +129,7 @@ class TopFlow(SequentialFlow):
 			}
 			if m.mod_name.startswith('tt_um_'):
 				user_modules.append(m.mod_name)
-			elif m.mod_name.startswith('tt_pg_') or m.mod_name.startswith('tt_asw_'):
+			elif m.mod_name.startswith('tt_pg_') or m.mod_name.startswith('tt_asw_') or m.mod_name.startswith('tt_logo_'):
 				macros[m.mod_name].update({
 					'nl': f'dir::verilog/{m.mod_name:s}.v',
 				})
@@ -229,6 +229,7 @@ class TopFlow(SequentialFlow):
 		# LVS
 		"MAGIC_DEF_LABELS" : False,
 		"MAGIC_EXT_SHORT_RESISTOR" : True, # Fixes LVS failures when more than two pins are connected to the same net
+		"LVS_FLATTEN_CELLS": ["tt_logo_top", "tt_logo_bottom"],
 	}
 
 	# Update PDN config

py/tt/elements.py

@@ -528,6 +528,20 @@ def _render(self, dwg):
 			))
 
 
+class Logo(LayoutElement):
+
+	def __init__(self, layout, variant):
+		# Set mod_name
+		self.mod_name = f'tt_logo_{variant:s}'
+
+		# Super
+		super().__init__(
+			layout,
+			layout.glb.logo.width,
+			layout.glb.logo.height,
+		)
+
+
 class Top(LayoutElement):
 	"""
 	Top level grid aligned area containing all TT elements
@@ -592,6 +606,13 @@ def __init__(self, layout, placer):
 
 		self.add_child(ctrl, Point(ctrl_x, ctrl_y), 'N', name='ctrl_I')
 
+		# Add Logo & Shuttle ID
+		logo_top = Logo(layout, 'top')
+		self.add_child(logo_top, Point(layout.glb.logo.pos_x, layout.glb.logo.top_pos_y), 'N', name='logo_top_I')
+
+		logo_bottom = Logo(layout, 'bottom')
+		self.add_child(logo_bottom, Point(layout.glb.logo.pos_x, layout.glb.logo.bottom_pos_y), 'N', name='logo_bottom_I')
+
 
 class Die(LayoutElement):
 	"""

py/tt/layout.py

@@ -74,6 +74,7 @@ def global_layout(self):
 		glb.ctrl   = ConfigNode()
 		glb.pg_vdd = ConfigNode()
 		glb.pg_vaa = ConfigNode()
+		glb.logo   = ConfigNode()
 
 		# Size of the various busses
 		self.vspine = ConfigNode({
@@ -164,6 +165,14 @@ def global_layout(self):
 		glb.pg_vaa.width  = self.cfg.pdk.pwrgate.vaa.width
 		glb.pg_vaa.offset = self._align_x(glb.pg_vaa.width, ceil=True) + glb.margin.x
 
+		# Logo & Shuttle ID
+		glb.logo.width        = self.cfg.tt.logo.size
+		glb.logo.height       = self.cfg.tt.logo.size
+		glb.logo.pos_x        = (glb.top.width - glb.logo.width) // 2
+		glb.logo.top_pos_y    = glb.top.height - glb.logo.height - glb.margin.y
+		glb.logo.bottom_pos_y = glb.margin.y
+
+
 	def _ply_len(self, ply):
 		return sum([x[1] or 1 for x in block_ply])
 

rtl/tt_logo_bottom.v

@@ -0,0 +1,4 @@
+`default_nettype none
+
+module tt_logo_bottom ();
+endmodule

rtl/tt_logo_top.v

@@ -0,0 +1,4 @@
+`default_nettype none
+
+module tt_logo_top ();
+endmodule

rtl/tt_top.v

@@ -277,4 +277,14 @@ module tt_top #(
 		end
 	end
 
+
+	// Logo & Shuttle ID
+	// -----------------
+
+	(* blackbox, keep *)
+	tt_logo_top logo_top_I ();
+
+	(* blackbox, keep *)
+	tt_logo_bottom logo_bottom_I ();
+
 endmodule // tt_top