build/xx/toolchains: allows override clock naming

litex/build/altera/platform.py

@@ -44,8 +44,8 @@ def get_verilog(self, *args, special_overrides=dict(), **kwargs):
     def build(self, *args, **kwargs):
         return self.toolchain.build(self, *args, **kwargs)
 
-    def add_period_constraint(self, clk, period, keep=False):
-        self.toolchain.add_period_constraint(self, clk, period, keep=False)
+    def add_period_constraint(self, clk, period, keep=False, name=None):
+        self.toolchain.add_period_constraint(self, clk, period, keep=keep, name=name)
 
     def add_false_path_constraint(self, from_, to):
         if hasattr(from_, "p"):

litex/build/altera/quartus.py

@@ -89,17 +89,20 @@ def build_timing_constraints(self, vns):
         sdc = []
 
         # Clock constraints
-        for clk, period in sorted(self.clocks.items(), key=lambda x: x[0].duid):
+        for clk, [period, name] in sorted(self.clocks.items(), key=lambda x: x[0].duid):
             is_port = False
             for sig, pins, others, resname in self.named_sc:
                 if sig == vns.get_name(clk):
                     is_port = True
+            clk_sig = self._vns.get_name(clk)
+            if name is None:
+                name = clk_sig
             if is_port:
-                tpl = "create_clock -name {clk} -period {period} [get_ports {{{clk}}}]"
-                sdc.append(tpl.format(clk=vns.get_name(clk), period=str(period)))
+                tpl = "create_clock -name {name} -period {period} [get_ports {{{clk}}}]"
+                sdc.append(tpl.format(name=name, clk=clk_sig, period=str(period)))
             else:
-                tpl = "create_clock -name {clk} -period {period} [get_nets {{{clk}}}]"
-                sdc.append(tpl.format(clk=vns.get_name(clk), period=str(period)))
+                tpl = "create_clock -name {name} -period {period} [get_nets {{{clk}}}]"
+                sdc.append(tpl.format(name=name, clk=clk_sig, period=str(period)))
 
         # Enable automatical constraint generation for PLLs
         sdc.append("derive_pll_clocks -use_net_name")

litex/build/anlogic/anlogic.py

@@ -62,8 +62,11 @@ def build_io_constraints(self):
 
     def build_timing_constraints(self, vns):
         sdc = []
-        for clk, period in sorted(self.clocks.items(), key=lambda x: x[0].duid):
-            sdc.append(f"create_clock -name {vns.get_name(clk)} -period {str(period)} [get_ports {{{vns.get_name(clk)}}}]")
+        for clk, [period, name] in sorted(self.clocks.items(), key=lambda x: x[0].duid):
+            clk_sig = self._vns.get_name(clk)
+            if name is None:
+                name = clk_sig
+            sdc.append(f"create_clock -name {name} -period {str(period)} [get_ports {{{clk_sig}}}]")
         tools.write_to_file("top.sdc", "\n".join(sdc))
         return ("top.sdc", "SDC")
 

litex/build/efinix/efinity.py

@@ -63,17 +63,22 @@ def build_timing_constraints(self, vns):
         sdc = []
 
         # Clock constraints
-        for clk, period in sorted(self.clocks.items(), key=lambda x: x[0].duid):
+        for clk, [period, name] in sorted(self.clocks.items(), key=lambda x: x[0].duid):
             is_port = False
             for sig, pins, others, resname in self.named_sc:
                 if sig == self._vns.get_name(clk):
                     is_port = True
+
+            clk_sig = self._vns.get_name(clk)
+            if name is None:
+                name = clk_sig
+
             if is_port:
-                tpl = "create_clock -name {clk} -period {period} [get_ports {{{clk}}}]"
-                sdc.append(tpl.format(clk=self._vns.get_name(clk), period=str(period)))
+                tpl = "create_clock -name {name} -period {period} [get_ports {{{clk}}}]"
+                sdc.append(tpl.format(name=name, clk=clk_sig, period=str(period)))
             else:
-                tpl = "create_clock -name {clk} -period {period} [get_nets {{{clk}}}]"
-                sdc.append(tpl.format(clk=self._vns.get_name(clk), period=str(period)))
+                tpl = "create_clock -name {name} -period {period} [get_nets {{{clk}}}]"
+                sdc.append(tpl.format(name=name, clk=clk_sig, period=str(period)))
 
         # False path constraints
         for from_, to in sorted(self.false_paths, key=lambda x: (x[0].duid, x[1].duid)):

litex/build/generic_platform.py

@@ -366,8 +366,8 @@ def request_remaining(self, *args, **kwargs):
     def lookup_request(self, *args, **kwargs):
         return self.constraint_manager.lookup_request(*args, **kwargs)
 
-    def add_period_constraint(self, clk, period, keep=True):
-        self.toolchain.add_period_constraint(self, clk, period, keep=keep)
+    def add_period_constraint(self, clk, period, keep=True, name=None):
+        self.toolchain.add_period_constraint(self, clk, period, keep=keep, name=name)
 
     def add_false_path_constraint(self, from_, to):
         raise NotImplementedError

litex/build/generic_toolchain.py

@@ -162,7 +162,7 @@ def build(self, platform, fragment,
 
         return v_output.ns
 
-    def add_period_constraint(self, platform, clk, period, keep=True):
+    def add_period_constraint(self, platform, clk, period, keep=True, name=None):
         if clk is None:
             return
         if hasattr(clk, "p"):
@@ -171,10 +171,10 @@ def add_period_constraint(self, platform, clk, period, keep=True):
             clk.attr.add("keep")
         period = math.floor(period*1e3)/1e3 # Round to lowest picosecond.
         if clk in self.clocks:
-            if period != self.clocks[clk]:
+            if period != self.clocks[clk][0]:
                 raise ValueError("Clock already constrained to {:.2f}ns, new constraint to {:.2f}ns"
                     .format(self.clocks[clk], period))
-        self.clocks[clk] = period
+        self.clocks[clk] = [period, name]
 
     def add_false_path_constraint(self, platform, from_, to, keep=True):
         if keep:

litex/build/gowin/gowin.py

@@ -89,8 +89,11 @@ def build_io_constraints(self):
 
     def build_timing_constraints(self, vns):
         sdc = []
-        for clk, period in sorted(self.clocks.items(), key=lambda x: x[0].duid):
-            sdc.append(f"create_clock -name {vns.get_name(clk)} -period {str(period)} [get_ports {{{vns.get_name(clk)}}}]")
+        for clk, [period, name] in sorted(self.clocks.items(), key=lambda x: x[0].duid):
+            clk_sig = self._vns.get_name(clk)
+            if name is None:
+                name = clk_sig
+            sdc.append(f"create_clock -name {name} -period {str(period)} [get_ports {{{clk_sig}}}]")
         tools.write_to_file(f"{self._build_name}.sdc", "\n".join(sdc))
         return (f"{self._build_name}.sdc", "SDC")
 

litex/build/lattice/diamond.py

@@ -84,7 +84,7 @@ def build_io_constraints(self):
             lpf.append("\n".join(self.named_pc))
 
         # Note: .lpf is only used post-synthesis, Synplify constraints clocks by default to 200MHz.
-        for clk, period in self.clocks.items():
+        for clk, [period, _] in self.clocks.items():
             clk_name = self._vns.get_name(clk)
             lpf.append("FREQUENCY {} \"{}\" {} MHz;".format(
                 "PORT" if clk_name in [name for name, _, _, _ in self.named_sc] else "NET",

litex/build/lattice/icestorm.py

@@ -67,7 +67,7 @@ def build_io_constraints(self):
 
     def build_timing_constraints(self, vns):
         r = ""
-        for clk, period in self.clocks.items():
+        for clk, [period, _] in self.clocks.items():
             r += """ctx.addClock("{}", {})\n""".format(vns.get_name(clk), 1e3/period)
         tools.write_to_file(self._build_name + "_pre_pack.py", r)
         return (self._build_name + "_pre_pack.py", "PY")

litex/build/lattice/radiant.py

@@ -56,13 +56,15 @@ def _build_pdc(named_sc, named_pc, clocks, vns, build_name):
         pdc.append("\n".join(named_pc))
 
     # Note: .pdc is only used post-synthesis, Synplify constraints clocks by default to 200MHz.
-    for clk, period in clocks.items():
-        clk_name = vns.get_name(clk)
+    for clk, [period, clk_name] in clocks.items():
+        clk_sig = vns.get_name(clk)
+        if clk_name is None:
+            clk_name = clk_sig
         pdc.append("create_clock -period {} -name {} [{} {}];".format(
             str(period),
             clk_name,
-            "get_ports" if clk_name in [name for name, _, _, _ in named_sc] else "get_nets",
-            clk_name
+            "get_ports" if clk_sig in [name for name, _, _, _ in named_sc] else "get_nets",
+            clk_sig
             ))
 
     tools.write_to_file(build_name + ".pdc", "\n".join(pdc))

litex/build/lattice/trellis.py

@@ -145,7 +145,7 @@ def nextpnr_ecp5_parse_device(self, device):
         "lfe5um5g-85f": "um5g-85k",
     }
 
-    def add_period_constraint(self, platform, clk, period):
+    def add_period_constraint(self, platform, clk, period, name=None):
         if clk is None:
             return
         if hasattr(clk, "p"):

litex/build/microsemi/libero_soc.py

@@ -187,10 +187,13 @@ def build_project(self):
     def build_timing_constraints(self, vns):
         sdc = []
 
-        for clk, period in sorted(self.clocks.items(), key=lambda x: x[0].duid):
+        for clk, [period, name] in sorted(self.clocks.items(), key=lambda x: x[0].duid):
+            clk_sig = self._vns.get_name(clk)
+            if name is None:
+                name = clk_sig
             sdc.append(
-                "create_clock -name {clk} -period " + str(period) +
-                " [get_nets {clk}]".format(clk=vns.get_name(clk)))
+                "create_clock -name {name} -period " + str(period) +
+                " [get_nets {clk}]".format(name=name, clk=clk_sig))
         for from_, to in sorted(self.false_paths,
                                 key=lambda x: (x[0].duid, x[1].duid)):
             sdc.append(

litex/build/osfpga/osfpga.py

@@ -35,8 +35,11 @@ def build_io_constraints(self):
 
     def build_timing_constraints(self, vns):
         sdc = []
-        for clk, period in sorted(self.clocks.items(), key=lambda x: x[0].duid):
-            sdc.append(f"create_clock -name {vns.get_name(clk)} -period {str(period)} [get_ports {{{vns.get_name(clk)}}}]")
+        for clk, [period, name] in sorted(self.clocks.items(), key=lambda x: x[0].duid):
+            clk_sig = self._vns.get_name(clk)
+            if name is None:
+                name = clk_sig
+            sdc.append(f"create_clock -name {name} -period {str(period)} [get_ports {{{clk_sig}}}]")
         with open(f"{self._build_name}.sdc", "w") as f:
             f.write("\n".join(sdc))
         return (self._build_name + ".sdc", "SDC")

litex/build/xilinx/f4pga.py

@@ -69,7 +69,7 @@ def build_io_constraints(self):
 
     def build_timing_constraints(self, vns):
         self.platform.add_platform_command(_xdc_separator("Clock constraints"))
-        for clk, period in sorted(self.clocks.items(), key=lambda x: x[0].duid):
+        for clk, [period, name] in sorted(self.clocks.items(), key=lambda x: x[0].duid):
             self.platform.add_platform_command(
                 "create_clock -period " + str(period) +
                 " {clk}", clk=clk)

litex/build/xilinx/ise.py

@@ -205,7 +205,7 @@ def run_script(self, script):
     # constraints and other constraints otherwise it will be unable to trace
     # them through clock objects like DCM and PLL objects.
 
-    def add_period_constraint(self, platform, clk, period, keep=True):
+    def add_period_constraint(self, platform, clk, period, keep=True, name=None):
         if clk is None:
             return
         if hasattr(clk, "p"):

litex/build/xilinx/vivado.py

@@ -169,10 +169,13 @@ def get_clk_type(clk):
                 False :  "nets",
                 True  : "ports",
             }[hasattr(clk, "port")]
-        for clk, period in sorted(self.clocks.items(), key=lambda x: x[0].duid):
+        for clk, [period, name] in sorted(self.clocks.items(), key=lambda x: x[0].duid):
+            clk_sig = self._vns.get_name(clk)
+            if name is None:
+                name = clk_sig
             self.platform.add_platform_command(
-                "create_clock -name {clk} -period " + str(period) +
-                " [get_" + get_clk_type(clk) + " {clk}]", clk=clk)
+                "create_clock -name {name} -period " + str(period) +
+                " [get_" + get_clk_type(clk) + " {clk}]", name=name, clk=clk)
         for _from, _to in sorted(self.false_paths, key=lambda x: (x[0].duid, x[1].duid)):
             self.platform.add_platform_command(
                 "set_clock_groups "