litex/milkymist/asmicon/__init__.py

74 lines
2.4 KiB
Python

from migen.fhdl.structure import *
from migen.bus import dfi, asmibus
from milkymist.asmicon.refresher import *
from milkymist.asmicon.bankmachine import *
from milkymist.asmicon.multiplexer import *
class PhySettings:
def __init__(self, dfi_d, nphases, rdphase, wrphase):
self.dfi_d = dfi_d
self.nphases = nphases
self.rdphase = rdphase
self.wrphase = wrphase
class GeomSettings:
def __init__(self, bank_a, row_a, col_a):
self.bank_a = bank_a
self.row_a = row_a
self.col_a = col_a
self.mux_a = max(row_a, col_a)
class TimingSettings:
def __init__(self, tRP, tRCD, tWR, tREFI, tRFC, CL, rd_delay, slot_time, read_time, write_time):
self.tRP = tRP
self.tRCD = tRCD
self.tWR = tWR
self.tREFI = tREFI
self.tRFC = tRFC
self.CL = CL
self.rd_delay = rd_delay
self.slot_time = slot_time
self.read_time = read_time
self.write_time = write_time
class ASMIcon:
def __init__(self, phy_settings, geom_settings, timing_settings):
self.phy_settings = phy_settings
self.geom_settings = geom_settings
self.timing_settings = timing_settings
self.finalized = False
self.dfi = dfi.Interface(self.geom_settings.mux_a,
self.geom_settings.bank_a,
self.phy_settings.dfi_d,
self.phy_settings.nphases)
burst_length = self.phy_settings.nphases*2
self.address_align = log2_int(burst_length)
aw = self.geom_settings.bank_a + self.geom_settings.row_a + self.geom_settings.col_a - self.address_align
dw = self.phy_settings.dfi_d*self.phy_settings.nphases
self.hub = asmibus.Hub(aw, dw, self.timing_settings.slot_time)
def finalize(self):
if self.finalized:
raise FinalizeError
self.finalized = True
self.hub.finalize()
slots = self.hub.get_slots()
self.refresher = Refresher(self.geom_settings.mux_a, self.geom_settings.bank_a,
self.timing_settings.tRP, self.timing_settings.tREFI, self.timing_settings.tRFC)
self.bank_machines = [BankMachine(self.geom_settings, self.timing_settings, self.address_align, i, slots) for i in range(2**self.geom_settings.bank_a)]
self.multiplexer = Multiplexer(self.phy_settings, self.geom_settings, self.timing_settings,
self.bank_machines, self.refresher,
self.dfi, self.hub)
def get_fragment(self):
if not self.finalized:
raise FinalizeError
return self.hub.get_fragment() + \
self.refresher.get_fragment() + \
sum([bm.get_fragment() for bm in self.bank_machines], Fragment()) + \
self.multiplexer.get_fragment()