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32-device, 8-bit CSR bus

This commit is contained in:
Sebastien Bourdeauducq 2011-12-17 15:54:49 +01:00
parent 6f8a6db40a
commit 1a845d4553
2 changed files with 6 additions and 6 deletions
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6
migen/bank/csrgen.py
View File

@ -13,7 +13,7 @@ class Bank:
comb = [] comb = []
sync = [] sync = []
comb.append(self._sel.eq(self.interface.a_i[10:] == Constant(self.address, BV(4)))) comb.append(self._sel.eq(self.interface.a_i[9:] == Constant(self.address, BV(5))))
nregs = len(self.description) nregs = len(self.description)
nbits = bits_for(nregs-1) nbits = bits_for(nregs-1)
@ -53,10 +53,10 @@ class Bank:
else: else:
brcases.append([Constant(i, BV(nbits)), self.interface.d_o.eq(brs[0])]) brcases.append([Constant(i, BV(nbits)), self.interface.d_o.eq(brs[0])])
if brcases: if brcases:
sync.append(self.interface.d_o.eq(Constant(0, BV(32)))) sync.append(self.interface.d_o.eq(Constant(0, BV(8))))
sync.append(If(self._sel, Case(self.interface.a_i[:nbits], *brcases))) sync.append(If(self._sel, Case(self.interface.a_i[:nbits], *brcases)))
else: else:
comb.append(self.interface.d_o.eq(Constant(0, BV(32)))) comb.append(self.interface.d_o.eq(Constant(0, BV(8))))
# Device access # Device access
for reg in self.description: for reg in self.description:

6
migen/bus/csr.py
View File

@ -4,8 +4,8 @@ from migen.bus.simple import Simple
_desc = [ _desc = [
(True, "a", 14), (True, "a", 14),
(True, "we", 1), (True, "we", 1),
(True, "d", 32), (True, "d", 8),
(False, "d", 32) (False, "d", 8)
] ]
class Master(Simple): class Master(Simple):
@ -23,7 +23,7 @@ class Interconnect:
def get_fragment(self): def get_fragment(self):
comb = [] comb = []
rb = Constant(0, BV(32)) rb = Constant(0, BV(8))
for slave in self.slaves: for slave in self.slaves:
comb.append(slave.a_i.eq(self.master.a_o)) comb.append(slave.a_i.eq(self.master.a_o))
comb.append(slave.we_i.eq(self.master.we_o)) comb.append(slave.we_i.eq(self.master.we_o))