litex/misoc/interconnect/wishbone2lasmi.py

50 lines
1.2 KiB
Python

from migen import *
from migen.genlib.fsm import FSM, NextState
class WB2LASMI(Module):
def __init__(self, wishbone, lasmim):
###
# Control FSM
self.submodules.fsm = fsm = FSM(reset_state="IDLE")
fsm.act("IDLE",
If(wishbone.cyc & wishbone.stb,
NextState("REQUEST")
)
)
fsm.act("REQUEST",
lasmim.stb.eq(1),
lasmim.we.eq(wishbone.we),
If(lasmim.req_ack,
If(wishbone.we,
NextState("WRITE_DATA")
).Else(
NextState("READ_DATA")
)
)
)
fsm.act("WRITE_DATA",
If(lasmim.dat_w_ack,
lasmim.dat_we.eq(wishbone.sel),
wishbone.ack.eq(1),
NextState("IDLE")
)
)
fsm.act("READ_DATA",
If(lasmim.dat_r_ack,
wishbone.ack.eq(1),
NextState("IDLE")
)
)
# Address / Datapath
self.comb += [
lasmim.adr.eq(wishbone.adr),
If(lasmim.dat_w_ack,
lasmim.dat_w.eq(wishbone.dat_w),
),
wishbone.dat_r.eq(lasmim.dat_r)
]