nexus: Add ECLK bels

Signed-off-by: gatecat <gatecat@ds0.me>

nexus/constids.inc

@@ -525,6 +525,15 @@ X(SCLKOUT)
 X(ECLK)
 X(CEIN)
 
+X(ECLKDIV)
+X(ECLKDIV_CORE)
+X(ECLKSYNC)
+X(ECLKSYNC_CORE)
+
+X(ECLKIN)
+X(DIVOUT)
+X(ECLKOUT)
+
 X(IDDRX1)
 X(ODDRX1)
 X(TXDATA0)

nexus/fasm.cc

@@ -577,6 +577,15 @@ struct NexusFasmWriter
         write_enum(cell, "DCSMODE", "VCC");
         pop(2);
     }
+    // Write config for ECLKDIV
+    void write_eclkdiv(const CellInfo *cell)
+    {
+        BelId bel = cell->bel;
+        push_bel(bel);
+        write_enum(cell, "ECLK_DIV", "DISABLE");
+        write_enum(cell, "GSR", "DISABLED");
+        pop();
+    }
     // Write config for an OXIDE_EBR cell
     void write_bram(const CellInfo *cell)
     {
@@ -1142,6 +1151,8 @@ struct NexusFasmWriter
                 write_lmmi(ci);
             else if (ci->type == id_CONFIG_CLKRST_CORE)
                 write_cfg_clkrst(ci);
+            else if (ci->type == id_ECLKDIV_CORE)
+                write_eclkdiv(ci);
             blank();
         }
         // Handle DCC route-throughs

nexus/pack.cc

@@ -906,8 +906,9 @@ struct NexusPacker
         for (size_t i = 0; i < std::min<size_t>(clk_fanout.size(), available_globals); i++) {
             NetInfo *net = ctx->nets.at(clk_fanout.at(i).second).get();
             log_info("     promoting clock net '%s'\n", ctx->nameOf(net));
-            insert_buffer(net, id_DCC, "glb_clk", id_CLKI, id_CLKO,
-                          [&](const PortRef &port) { return port.cell->type != id_DCC; });
+            insert_buffer(net, id_DCC, "glb_clk", id_CLKI, id_CLKO, [&](const PortRef &port) {
+                return port.cell->type != id_DCC && !port.port.in(id_ECLK, id_ECLKIN);
+            });
         }
     }
 

nexus/pins.cc

@@ -257,7 +257,18 @@ static const dict<IdString, Arch::CellPinsData> base_cell_pin_data = {
          {
                  {{}, PINSTYLE_DEDI},
          }},
-
+        {id_ECLKDIV_CORE,
+         {
+                 {{id_ECLKIN}, PINSTYLE_DEDI},
+                 {{id_DIVOUT}, PINSTYLE_DEDI},
+                 {{}, PINSTYLE_CIB},
+         }},
+        {id_ECLKSYNC_CORE,
+         {
+                 {{id_ECLKIN}, PINSTYLE_DEDI},
+                 {{id_ECLKOUT}, PINSTYLE_DEDI},
+                 {{}, PINSTYLE_CIB},
+         }},
 };
 } // namespace