litex/top.py

161 lines
4.1 KiB
Python

from fractions import Fraction
from math import ceil
from migen.fhdl.structure import *
from migen.fhdl import verilog, autofragment
from migen.bus import wishbone, wishbone2asmi, csr, wishbone2csr, dfi
from milkymist import m1crg, lm32, norflash, uart, s6ddrphy, dfii, asmicon, \
identifier, timer, minimac3, framebuffer, asmiprobe
from cmacros import get_macros
from constraints import Constraints
MHz = 1000000
clk_freq = (83 + Fraction(1, 3))*MHz
sram_size = 4096 # in bytes
l2_size = 8192 # in bytes
clk_period_ns = 1000000000/clk_freq
def ns(t, margin=True):
if margin:
t += clk_period_ns/2
return ceil(t/clk_period_ns)
sdram_phy = asmicon.PhySettings(
dfi_d=64,
nphases=2,
rdphase=0,
wrphase=1
)
sdram_geom = asmicon.GeomSettings(
bank_a=2,
row_a=13,
col_a=10
)
sdram_timing = asmicon.TimingSettings(
tRP=ns(15),
tRCD=ns(15),
tWR=ns(15),
tREFI=ns(7800, False),
tRFC=ns(70),
CL=3,
rd_delay=4,
read_time=32,
write_time=16
)
csr_macros = get_macros("common/csrbase.h")
def csr_offset(name):
base = int(csr_macros[name + "_BASE"], 0)
assert((base >= 0xe0000000) and (base <= 0xe0010000))
return (base - 0xe0000000)//0x800
interrupt_macros = get_macros("common/interrupt.h")
def interrupt_n(name):
return int(interrupt_macros[name + "_INTERRUPT"], 0)
version = get_macros("common/version.h")["VERSION"][1:-1]
def get():
#
# ASMI
#
asmicon0 = asmicon.ASMIcon(sdram_phy, sdram_geom, sdram_timing)
asmiport_wb = asmicon0.hub.get_port()
asmiport_fb = asmicon0.hub.get_port(2)
asmicon0.finalize()
#
# DFI
#
ddrphy0 = s6ddrphy.S6DDRPHY(sdram_geom.mux_a, sdram_geom.bank_a, sdram_phy.dfi_d)
dfii0 = dfii.DFIInjector(csr_offset("DFII"),
sdram_geom.mux_a, sdram_geom.bank_a, sdram_phy.dfi_d, sdram_phy.nphases)
dficon0 = dfi.Interconnect(dfii0.master, ddrphy0.dfi)
dficon1 = dfi.Interconnect(asmicon0.dfi, dfii0.slave)
#
# WISHBONE
#
cpu0 = lm32.LM32()
norflash0 = norflash.NorFlash(25, 12)
sram0 = wishbone.SRAM(sram_size)
minimac0 = minimac3.MiniMAC(csr_offset("MINIMAC"))
wishbone2asmi0 = wishbone2asmi.WB2ASMI(l2_size//4, asmiport_wb)
wishbone2csr0 = wishbone2csr.WB2CSR()
# norflash 0x00000000 (shadow @0x80000000)
# SRAM/debug 0x10000000 (shadow @0x90000000)
# USB 0x20000000 (shadow @0xa0000000)
# Ethernet 0x30000000 (shadow @0xb0000000)
# SDRAM 0x40000000 (shadow @0xc0000000)
# CSR bridge 0x60000000 (shadow @0xe0000000)
wishbonecon0 = wishbone.InterconnectShared(
[
cpu0.ibus,
cpu0.dbus
], [
(lambda a: a[26:29] == 0, norflash0.bus),
(lambda a: a[26:29] == 1, sram0.bus),
(lambda a: a[26:29] == 3, minimac0.membus),
(lambda a: a[27:29] == 2, wishbone2asmi0.wishbone),
(lambda a: a[27:29] == 3, wishbone2csr0.wishbone)
],
register=True)
#
# CSR
#
uart0 = uart.UART(csr_offset("UART"), clk_freq, baud=115200)
identifier0 = identifier.Identifier(csr_offset("ID"), 0x4D31, version, int(clk_freq))
timer0 = timer.Timer(csr_offset("TIMER0"))
fb0 = framebuffer.Framebuffer(csr_offset("FB"), asmiport_fb)
asmiprobe0 = asmiprobe.ASMIprobe(csr_offset("ASMIPROBE"), asmicon0.hub)
csrcon0 = csr.Interconnect(wishbone2csr0.csr, [
uart0.bank.bus,
dfii0.bank.bus,
identifier0.bank.bus,
timer0.bank.bus,
minimac0.bank.bus,
fb0.bank.bus,
asmiprobe0.bank.bus
])
#
# Interrupts
#
interrupts = Fragment([
cpu0.interrupt[interrupt_n("UART")].eq(uart0.events.irq),
cpu0.interrupt[interrupt_n("TIMER0")].eq(timer0.events.irq),
cpu0.interrupt[interrupt_n("MINIMAC")].eq(minimac0.events.irq)
])
#
# Housekeeping
#
crg0 = m1crg.M1CRG(50*MHz, clk_freq)
ddrphy_strobes = Fragment([
ddrphy0.clk4x_wr_strb.eq(crg0.clk4x_wr_strb),
ddrphy0.clk4x_rd_strb.eq(crg0.clk4x_rd_strb)
])
frag = autofragment.from_local() \
+ interrupts \
+ ddrphy_strobes
cst = Constraints(crg0, norflash0, uart0, ddrphy0, minimac0, fb0)
src_verilog, vns = verilog.convert(frag,
cst.get_ios(),
name="soc",
clock_domains={
"sys": crg0.cd_sys,
"sys2x_270": crg0.cd_sys2x_270,
"sys4x_wr": crg0.cd_sys4x_wr,
"sys4x_rd": crg0.cd_sys4x_rd,
"vga": crg0.cd_vga
},
return_ns=True)
src_ucf = cst.get_ucf(vns)
return (src_verilog, src_ucf)