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vendor.lattice_machxo*: add MachXO3L support.

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Gwenhael Goavec-Merou 2020-06-21 19:24:47 +02:00 committed by GitHub
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commit 0aef5f4d48
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2 changed files with 12 additions and 7 deletions
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1
README.md
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@ -43,6 +43,7 @@ nMigen can be used to target any FPGA or ASIC process that accepts behavioral Ve
* Lattice iCE40 (toolchains: **Yosys+nextpnr**, LSE-iCECube2, Synplify-iCECube2); * Lattice iCE40 (toolchains: **Yosys+nextpnr**, LSE-iCECube2, Synplify-iCECube2);
* Lattice MachXO2 (toolchains: Diamond); * Lattice MachXO2 (toolchains: Diamond);
* Lattice MachXO3L (toolchains: Diamond);
* Lattice ECP5 (toolchains: **Yosys+nextpnr**, Diamond); * Lattice ECP5 (toolchains: **Yosys+nextpnr**, Diamond);
* Xilinx Spartan 3A (toolchains: ISE); * Xilinx Spartan 3A (toolchains: ISE);
* Xilinx Spartan 6 (toolchains: ISE); * Xilinx Spartan 6 (toolchains: ISE);

18
nmigen/vendor/lattice_machxo2.py → nmigen/vendor/lattice_machxo_2_3l.py vendored
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@ -4,10 +4,11 @@ from ..hdl import *
from ..build import * from ..build import *
__all__ = ["LatticeMachXO2Platform"] __all__ = ["LatticeMachXO2Platform", "LatticeMachXO3LPlatform"]
# MachXO2 and MachXO3L primitives are the same. Handle both using
class LatticeMachXO2Platform(TemplatedPlatform): # one class and expose user-aliases for convenience.
class LatticeMachXO2Or3LPlatform(TemplatedPlatform):
""" """
Required tools: Required tools:
* ``pnmainc`` * ``pnmainc``
@ -131,7 +132,7 @@ class LatticeMachXO2Platform(TemplatedPlatform):
] ]
def create_missing_domain(self, name): def create_missing_domain(self, name):
# Lattice MachXO2 devices have two global set/reset signals: PUR, which is driven at # Lattice MachXO2/MachXO3L devices have two global set/reset signals: PUR, which is driven at
# startup by the configuration logic and unconditionally resets every storage element, # startup by the configuration logic and unconditionally resets every storage element,
# and GSR, which is driven by user logic and each storage element may be configured as # and GSR, which is driven by user logic and each storage element may be configured as
# affected or unaffected by GSR. PUR is purely asynchronous, so even though it is # affected or unaffected by GSR. PUR is purely asynchronous, so even though it is
@ -148,8 +149,8 @@ class LatticeMachXO2Platform(TemplatedPlatform):
gsr0 = Signal() gsr0 = Signal()
gsr1 = Signal() gsr1 = Signal()
m = Module() m = Module()
# There is no end-of-startup signal on MachXO2, but PUR is released after IOB enable, # There is no end-of-startup signal on MachXO2/MachXO3L, but PUR is released after IOB
# so a simple reset synchronizer (with PUR as the asynchronous reset) does the job. # enable, so a simple reset synchronizer (with PUR as the asynchronous reset) does the job.
m.submodules += [ m.submodules += [
Instance("FD1S3AX", p_GSR="DISABLED", i_CK=clk_i, i_D=~rst_i, o_Q=gsr0), Instance("FD1S3AX", p_GSR="DISABLED", i_CK=clk_i, i_D=~rst_i, o_Q=gsr0),
Instance("FD1S3AX", p_GSR="DISABLED", i_CK=clk_i, i_D=gsr0, o_Q=gsr1), Instance("FD1S3AX", p_GSR="DISABLED", i_CK=clk_i, i_D=gsr0, o_Q=gsr1),
@ -393,4 +394,7 @@ class LatticeMachXO2Platform(TemplatedPlatform):
) )
return m return m
# CDC primitives are not currently specialized for MachXO2. # CDC primitives are not currently specialized for MachXO2/MachXO3L.
LatticeMachXO2Platform = LatticeMachXO2Or3LPlatform
LatticeMachXO3LPlatform = LatticeMachXO2Or3LPlatform