hdl.mem: remove WritePort(priority=) argument.

The write port priority in Yosys is derived directly from the order
in which the ports are declared in the Verilog frontend. It is being
removed for several reasons:
  1. It is not clear if it works correctly for all cases (FFRAM,
     LUTRAM, BRAM).
  2. Although it is roundtripped via Verilog with correct simulation
     semantics, the resulting code has a high chance of being
     interpreted incorrectly by Xilinx tools.
  3. It cannot be roundtripped via FIRRTL, which is an alternative
     backend that is an interesting future option. (FIRRTL leaves
     write collision completely undefined.)
  3. It is a niche feature that, if it is needed, can be completely
     replaced using an explicit comparator, priority encoder, and
     write enable gating circuit. (This is what Xilinx recommends
     for handling this case.)

In the future we should extend nMigen's formal verification to assert
that a write collision does not happen.

nmigen/hdl/mem.py

@@ -132,7 +132,7 @@ def elaborate(self, platform):
 
 
 class WritePort(Elaboratable):
-    def __init__(self, memory, *, domain="sync", priority=0, granularity=None):
+    def __init__(self, memory, *, domain="sync", granularity=None):
         if granularity is None:
             granularity = memory.width
         if not isinstance(granularity, int) or granularity < 0:
@@ -147,7 +147,6 @@ def __init__(self, memory, *, domain="sync", priority=0, granularity=None):
 
         self.memory       = memory
         self.domain       = domain
-        self.priority     = priority
         self.granularity  = granularity
 
         self.addr = Signal.range(memory.depth,
@@ -164,7 +163,7 @@ def elaborate(self, platform):
             p_WIDTH=self.data.width,
             p_CLK_ENABLE=1,
             p_CLK_POLARITY=1,
-            p_PRIORITY=self.priority,
+            p_PRIORITY=0,
             i_CLK=ClockSignal(self.domain),
             i_EN=Cat(Repl(en_bit, self.granularity) for en_bit in self.en),
             i_ADDR=self.addr,

nmigen/test/test_hdl_mem.py

@@ -83,7 +83,6 @@ def test_write_port(self):
         wrport = mem.write_port()
         self.assertEqual(wrport.memory, mem)
         self.assertEqual(wrport.domain, "sync")
-        self.assertEqual(wrport.priority, 0)
         self.assertEqual(wrport.granularity, 8)
         self.assertEqual(len(wrport.addr), 2)
         self.assertEqual(len(wrport.data), 8)
@@ -94,7 +93,6 @@ def test_write_port_granularity(self):
         wrport = mem.write_port(granularity=2)
         self.assertEqual(wrport.memory, mem)
         self.assertEqual(wrport.domain, "sync")
-        self.assertEqual(wrport.priority, 0)
         self.assertEqual(wrport.granularity, 2)
         self.assertEqual(len(wrport.addr), 2)
         self.assertEqual(len(wrport.data), 8)