mirror of
https://github.com/rdolbeau/NuBusFPGA.git
synced 2024-12-23 01:30:32 +00:00
Move Vex to a 128-bit Wishbone, and add a bypass to access a dedicated memory port with a 128-bits datapath. Speeds up scrolling quite nicely.
This commit is contained in:
parent
d9c21e7abb
commit
94cd6a9411
File diff suppressed because it is too large
Load Diff
@ -5,6 +5,9 @@ from litex.soc.interconnect.csr import *
|
||||
|
||||
from litex.soc.interconnect import wishbone
|
||||
|
||||
from litedram.common import LiteDRAMNativePort
|
||||
from litedram.frontend.wishbone import LiteDRAMWishbone2Native
|
||||
|
||||
class GoblinAccel(Module): # AutoCSR ?
|
||||
def __init__(self, soc):
|
||||
platform = soc.platform
|
||||
@ -157,12 +160,92 @@ class GoblinAccel(Module): # AutoCSR ?
|
||||
]
|
||||
|
||||
#led0 = platform.request("user_led", 0)
|
||||
#self.comb += led0.eq(~local_reset)
|
||||
|
||||
#self.comb += led0.eq(~local_reset) # Vex connection to the primary bus
|
||||
self.ibus = ibus = wishbone.Interface()
|
||||
self.dbus = dbus = wishbone.Interface()
|
||||
#self.dbus = dbus = wishbone.Interface()
|
||||
vex_reset = Signal()
|
||||
|
||||
dbus_raw = wishbone.Interface(data_width=128, adr_width=28) # wide interface from the Vex, master
|
||||
dbus_sys = wishbone.Interface(data_width=128, adr_width=28) # wide interface to system wishbone
|
||||
dbus_mem = wishbone.Interface(data_width=128, adr_width=28) # wide interface for direct memory access
|
||||
self.dbus = dbus_sys
|
||||
|
||||
#masters = {}
|
||||
#masters["VexRiscv_AccelFB"] = dbus_raw
|
||||
|
||||
##slaves["VexSystemAccess"] = dbus
|
||||
##regions["VexSystemAccess"] = SoCRegion(origin=soc.mem_map.get("goblin_bt", None), size=0x00100000, cached=False)
|
||||
##slaves["VexMemoryAccess"] = dbus_mem
|
||||
##regions["VexSystemAccess"] = SoCRegion(origin=soc.mem_map.get("main_ram", None), size=0x10000000, cached=True)
|
||||
|
||||
#function_VexSystemAccess = lambda x: (x[24:28] != 0x8)
|
||||
#function_VexMemoryAccess = lambda x: (x[24:28] == 0x8)
|
||||
##function_VexSystemAccess = lambda x: (True)
|
||||
##function_VexMemoryAccess = lambda x: (False)
|
||||
|
||||
#slaves = [
|
||||
# (function_VexSystemAccess, dbus_sys),
|
||||
# (function_VexMemoryAccess, dbus_mem),
|
||||
#]
|
||||
|
||||
#self.submodules.crossbar = wishbone.Crossbar(
|
||||
# masters = masters.values(),
|
||||
# slaves = slaves,
|
||||
# register = False,
|
||||
# timeout_cycles = None
|
||||
#)
|
||||
#self.submodules.shared = wishbone.InterconnectShared(
|
||||
# masters = masters.values(),
|
||||
# slaves = slaves,
|
||||
# register = False,
|
||||
# timeout_cycles = None
|
||||
#)
|
||||
|
||||
self.comb += [
|
||||
If((dbus_raw.adr[24:28] == 0x8),
|
||||
dbus_sys.cyc.eq(0),
|
||||
dbus_sys.stb.eq(0),
|
||||
dbus_mem.cyc.eq(dbus_raw.cyc),
|
||||
dbus_mem.stb.eq(dbus_raw.stb),
|
||||
|
||||
dbus_raw.ack.eq(dbus_mem.ack),
|
||||
dbus_raw.err.eq(dbus_mem.err),
|
||||
dbus_raw.dat_r.eq(dbus_mem.dat_r),
|
||||
).Else(
|
||||
dbus_sys.cyc.eq(dbus_raw.cyc),
|
||||
dbus_sys.stb.eq(dbus_raw.stb),
|
||||
dbus_mem.cyc.eq(0),
|
||||
dbus_mem.stb.eq(0),
|
||||
|
||||
dbus_raw.ack.eq(dbus_sys.ack),
|
||||
dbus_raw.err.eq(dbus_sys.err),
|
||||
dbus_raw.dat_r.eq(dbus_sys.dat_r),
|
||||
),
|
||||
dbus_sys.dat_w.eq(dbus_raw.dat_w),
|
||||
dbus_mem.dat_w.eq(dbus_raw.dat_w),
|
||||
dbus_sys.we.eq(dbus_raw.we),
|
||||
dbus_mem.we.eq(dbus_raw.we),
|
||||
dbus_sys.adr.eq(dbus_raw.adr),
|
||||
dbus_mem.adr.eq(dbus_raw.adr),
|
||||
dbus_sys.sel.eq(dbus_raw.sel),
|
||||
dbus_mem.sel.eq(dbus_raw.sel),
|
||||
dbus_sys.cti.eq(dbus_raw.cti),
|
||||
dbus_mem.cti.eq(dbus_raw.cti),
|
||||
dbus_sys.bte.eq(dbus_raw.bte),
|
||||
dbus_mem.bte.eq(dbus_raw.bte),
|
||||
]
|
||||
|
||||
# now connect the memory
|
||||
|
||||
# memory port
|
||||
port = soc.sdram.crossbar.get_port()
|
||||
assert(port.data_width == 128)
|
||||
self.submodules.wb2native = LiteDRAMWishbone2Native(
|
||||
wishbone = dbus_mem,
|
||||
port = port,
|
||||
base_address = soc.bus.regions["main_ram"].origin
|
||||
)
|
||||
|
||||
self.comb += vex_reset.eq(ResetSignal("sys") | local_reset)
|
||||
self.specials += Instance(self.get_netlist_name(),
|
||||
i_clk = ClockSignal("sys"),
|
||||
@ -178,17 +261,17 @@ class GoblinAccel(Module): # AutoCSR ?
|
||||
i_iBusWishbone_ERR = ibus.err,
|
||||
o_iBusWishbone_CTI = ibus.cti,
|
||||
o_iBusWishbone_BTE = ibus.bte,
|
||||
o_dBusWishbone_CYC = dbus.cyc,
|
||||
o_dBusWishbone_STB = dbus.stb,
|
||||
i_dBusWishbone_ACK = dbus.ack,
|
||||
o_dBusWishbone_WE = dbus.we,
|
||||
o_dBusWishbone_ADR = dbus.adr,
|
||||
i_dBusWishbone_DAT_MISO = dbus.dat_r,
|
||||
o_dBusWishbone_DAT_MOSI = dbus.dat_w,
|
||||
o_dBusWishbone_SEL = dbus.sel,
|
||||
i_dBusWishbone_ERR = dbus.err,
|
||||
o_dBusWishbone_CTI = dbus.cti,
|
||||
o_dBusWishbone_BTE = dbus.bte,)
|
||||
o_dBusWishbone_CYC = dbus_raw.cyc,
|
||||
o_dBusWishbone_STB = dbus_raw.stb,
|
||||
i_dBusWishbone_ACK = dbus_raw.ack,
|
||||
o_dBusWishbone_WE = dbus_raw.we,
|
||||
o_dBusWishbone_ADR = dbus_raw.adr,
|
||||
i_dBusWishbone_DAT_MISO = dbus_raw.dat_r,
|
||||
o_dBusWishbone_DAT_MOSI = dbus_raw.dat_w,
|
||||
o_dBusWishbone_SEL = dbus_raw.sel,
|
||||
i_dBusWishbone_ERR = dbus_raw.err,
|
||||
o_dBusWishbone_CTI = dbus_raw.cti,
|
||||
o_dBusWishbone_BTE = dbus_raw.bte,)
|
||||
|
||||
self.add_sources(platform)
|
||||
|
||||
|
@ -320,7 +320,7 @@ class NuBusFPGA(SoCCore):
|
||||
self.submodules.wishbone_master_nubus = WishboneDomainCrossingMaster(platform=self.platform, slave=wishbone_master_sys, cd_master="nubus", cd_slave="sys")
|
||||
nubus_writemaster_sys = wishbone.Interface(data_width=self.bus.data_width)
|
||||
wishbone_slave_nubus = wishbone.Interface(data_width=self.bus.data_width)
|
||||
self.submodules.wishbone_slave_sys = WishboneDomainCrossingMaster(platform=self.platform, slave=wishbone_slave_nubus, cd_master="sys", cd_slave="nubus")
|
||||
self.submodules.wishbone_slave_sys = WishboneDomainCrossingMaster(platform=self.platform, slave=wishbone_slave_nubus, cd_master="sys", cd_slave="nubus", force_delay=6) # force delay needed to avoid back-to-back transaction running into issue https://github.com/alexforencich/verilog-wishbone/issues/4
|
||||
self.submodules.nubus = nubus_full.NuBus(platform=platform,
|
||||
wb_read=self.wishbone_master_nubus,
|
||||
wb_write=nubus_writemaster_sys,
|
||||
|
Loading…
Reference in New Issue
Block a user