fhdl: phase out pads

doc/index.rst

@@ -233,7 +233,6 @@ A "fragment" is a unit of logic, which is composed of:
 * a list of synchronous statements.
 * a list of instances.
 * a list of memories.
-* a set of pads, which are signals intended to be connected to off-chip devices.
 * a list of simulation functions (see :ref:`simulating`).
 
 Fragments can reference arbitrary signals, including signals that are referenced in other fragments. Fragments can be combined using the "+" operator, which returns a new fragment containing the concatenation of each pair of lists.

migen/fhdl/structure.py

@@ -268,7 +268,7 @@ class Memory:
 		self.init = init
 
 class Fragment:
-	def __init__(self, comb=None, sync=None, instances=None, memories=None, pads=set(), sim=None):
+	def __init__(self, comb=None, sync=None, instances=None, memories=None, sim=None):
 		if comb is None: comb = []
 		if sync is None: sync = []
 		if instances is None: instances = []
@@ -278,7 +278,6 @@ class Fragment:
 		self.sync = _sl(sync)
 		self.instances = instances
 		self.memories = memories
-		self.pads = pads
 		self.sim = sim
 	
 	def __add__(self, other):
@@ -286,7 +285,6 @@ class Fragment:
 			self.sync.l + other.sync.l,
 			self.instances + other.instances,
 			self.memories + other.memories,
-			self.pads | other.pads,
 			self.sim + other.sim)
 
 	def call_sim(self, simulator):

migen/fhdl/verilog.py

@@ -244,7 +244,6 @@ def convert(f, ios=set(), name="top",
 	if rst_signal is None:
 		rst_signal = Signal(name_override="sys_rst")
 		ios.add(rst_signal)
-	ios |= f.pads
 
 	ns = build_namespace(list_signals(f) \
 		| list_inst_ios(f, True, True, True) \