litex-boards/litex_boards/official/platforms/versa_ecp3.py

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2019-06-10 11:09:51 -04:00
# This file is Copyright (c) 2013 Florent Kermarrec <florent@enjoy-digital.fr>
# License: BSD
from litex.build.generic_platform import *
from litex.build.lattice import LatticePlatform
from litex.build.lattice.programmer import LatticeProgrammer
# IOs ----------------------------------------------------------------------------------------------
_io = [
("clk100", 0, Pins("L5"), IOStandard("LVDS25")),
("rst_n", 0, Pins("A21"), IOStandard("LVCMOS33")),
("user_led", 0, Pins("Y20"), IOStandard("LVCMOS33")),
("user_led", 1, Pins("AA21"), IOStandard("LVCMOS33")),
("user_led", 2, Pins("U18"), IOStandard("LVCMOS33")),
("user_led", 3, Pins("U19"), IOStandard("LVCMOS33")),
("user_led", 4, Pins("W19"), IOStandard("LVCMOS33")),
("user_led", 5, Pins("V19"), IOStandard("LVCMOS33")),
("user_led", 6, Pins("AB20"), IOStandard("LVCMOS33")),
("user_led", 7, Pins("AA20"), IOStandard("LVCMOS33")),
("user_dip_btn", 0, Pins("J7"), IOStandard("LVCMOS15")),
("user_dip_btn", 1, Pins("J6"), IOStandard("LVCMOS15")),
("user_dip_btn", 2, Pins("H2"), IOStandard("LVCMOS15")),
("user_dip_btn", 3, Pins("H3"), IOStandard("LVCMOS15")),
("user_dip_btn", 4, Pins("J3"), IOStandard("LVCMOS15")),
("user_dip_btn", 5, Pins("K3"), IOStandard("LVCMOS15")),
("user_dip_btn", 6, Pins("J2"), IOStandard("LVCMOS15")),
("user_dip_btn", 7, Pins("J1"), IOStandard("LVCMOS15")),
("serial", 0,
Subsignal("tx", Pins("B11"), IOStandard("LVCMOS33")), # X4 IO0
Subsignal("rx", Pins("B12"), IOStandard("LVCMOS33")), # X4 IO1
),
("eth_clocks", 0,
Subsignal("tx", Pins("C12")),
Subsignal("gtx", Pins("M2")),
Subsignal("rx", Pins("L4")),
IOStandard("LVCMOS33")
),
("eth", 0,
Subsignal("rst_n", Pins("L3")),
Subsignal("mdio", Pins("L2")),
Subsignal("mdc", Pins("V4")),
Subsignal("dv", Pins("M1")),
Subsignal("rx_er", Pins("M4")),
Subsignal("rx_data", Pins("M5 N1 N6 P6 T2 R2 P5 P3")),
Subsignal("tx_en", Pins("V3")),
Subsignal("tx_data", Pins("V1 U1 R3 P1 N5 N3 N4 N2")),
Subsignal("col", Pins("R1")),
Subsignal("crs", Pins("P4")),
IOStandard("LVCMOS33")
),
("eth_clocks", 1,
Subsignal("tx", Pins("M21")),
Subsignal("gtx", Pins("M19")),
Subsignal("rx", Pins("N19")),
IOStandard("LVCMOS33")
),
("eth", 1,
Subsignal("rst_n", Pins("R21")),
Subsignal("mdio", Pins("U16")),
Subsignal("mdc", Pins("Y18")),
Subsignal("dv", Pins("U15")),
Subsignal("rx_er", Pins("V20")),
Subsignal("rx_data", Pins("AB17 AA17 R19 V21 T17 R18 W21 Y21")),
Subsignal("tx_en", Pins("V22")),
Subsignal("tx_data", Pins("W22 R16 P17 Y22 T21 U22 P20 U20")),
Subsignal("col", Pins("N18")),
Subsignal("crs", Pins("P19")),
IOStandard("LVCMOS33")
),
]
# Platform -----------------------------------------------------------------------------------------
class Platform(LatticePlatform):
default_clk_name = "clk100"
default_clk_period = 10
def __init__(self):
LatticePlatform.__init__(self, "LFE3-35EA-6FN484C", _io)
def do_finalize(self, fragment):
LatticePlatform.do_finalize(self, fragment)
try:
self.add_period_constraint(self.lookup_request("eth_clocks", 0).rx, 1e9/125e6)
except ConstraintError:
pass
try:
self.add_period_constraint(self.lookup_request("eth_clocks", 1).rx, 1e9/125e6)
except ConstraintError:
pass
def create_programmer(self):
_xcf_template = """
<?xml version='1.0' encoding='utf-8' ?>
<!DOCTYPE ispXCF SYSTEM "IspXCF.dtd" >
<ispXCF version="3.4.1">
<Comment></Comment>
<Chain>
<Comm>JTAG</Comm>
<Device>
<SelectedProg value="TRUE"/>
<Pos>1</Pos>
<Vendor>Lattice</Vendor>
<Family>LatticeECP3</Family>
<Name>LFE3-35EA</Name>
<File>{bitstream_file}</File>
<Operation>Fast Program</Operation>
</Device>
</Chain>
<ProjectOptions>
<Program>SEQUENTIAL</Program>
<Process>ENTIRED CHAIN</Process>
<OperationOverride>No Override</OperationOverride>
<StartTAP>TLR</StartTAP>
<EndTAP>TLR</EndTAP>
<VerifyUsercode value="FALSE"/>
</ProjectOptions>
<CableOptions>
<CableName>USB2</CableName>
<PortAdd>FTUSB-0</PortAdd>
<USBID>Dual RS232-HS A Location 0000 Serial A</USBID>
<JTAGPinSetting>
TRST ABSENT;
ISPEN ABSENT;
</JTAGPinSetting>
</CableOptions>
</ispXCF>
"""
return LatticeProgrammer(_xcf_template)