27 lines
666 B
Python
27 lines
666 B
Python
from migen import *
|
|
from migen.genlib.fifo import SyncFIFO
|
|
|
|
|
|
class Buffer(Module):
|
|
def __init__(self, width=8, depth=128):
|
|
self.din = Signal(width)
|
|
self.i_stb = Signal()
|
|
|
|
self.dout = Signal(width)
|
|
self.o_stb = Signal()
|
|
self.o_ack = Signal()
|
|
|
|
# Underlying data structure
|
|
self.submodules.fifo = SyncFIFO(width, depth)
|
|
|
|
self.comb += [
|
|
# TX path
|
|
self.o_stb.eq(self.fifo.readable),
|
|
self.dout.eq(self.fifo.dout),
|
|
self.fifo.re.eq(self.o_ack),
|
|
|
|
# RX path
|
|
self.fifo.we.eq(self.i_stb),
|
|
self.fifo.din.eq(self.din),
|
|
]
|