def convert_yosys_json(device,
yosys_json,
top,
work_library='work',
verbose=False):
""" Converts Yosys Netlist JSON to FPGA interchange logical netlist. """
primitives = device.get_primitive_library()
primitive_cells = primitives.get_master_cell_list()
primitive_lib = {}
for lib_name, lib in primitives.libraries.items():
for cell in lib.cells.values():
primitive_lib[cell.name] = lib_name
consts = device.get_constants()
name = top
property_map = {}
top_module = yosys_json['modules'][top]
if 'attributes' in top_module:
property_map.update(top_module['attributes'])
top_instance_name = top
top_instance = CellInstance(
property_map=property_map, view='netlist', cell_name=top)
libraries = {
work_library: Library(work_library),
}
cells_used_in_top = find_all_cell_types_from_module(
top, yosys_json['modules'], primitive_cells)
cells_used_in_top.add(top)
module_errors = {}
for module_name, module_data in yosys_json['modules'].items():
if module_name not in cells_used_in_top:
if verbose:
print('Skipping {} because it is an unused cell type'.format(
module_name))
continue
if module_name in primitive_cells:
if verbose:
print('Skipping {} because it is a library cell'.format(
module_name))
continue
convert_cell(device, module_name, module_data, work_library, libraries,
yosys_json['modules'], verbose, module_errors, consts)
netlist = LogicalNetlist(
name=name,
property_map=property_map,
top_instance_name=top_instance_name,
top_instance=top_instance,
libraries=libraries)
required_cells = set()
for lib_name, lib in netlist.libraries.items():
for cell in lib.cells.values():
for cell_instance in cell.cell_instances.values():
required_cells.add(cell_instance.cell_name)
required_cells -= set(netlist.get_master_cell_list().keys())
for required_cell in sorted(required_cells):
if required_cell not in primitive_cells:
if required_cell in module_errors:
raise RuntimeError(module_errors[required_cell])
else:
raise RuntimeError(
'Failed to find cell type {}'.format(required_cell))
lib_name = primitive_lib[required_cell]
if lib_name not in libraries:
libraries[lib_name] = Library(lib_name)
prim_cell = primitive_cells[required_cell]
# Blackbox macro content, we only care about the primitive ports - the macro content is obtained from the chipdb
prim_cell.cell_instances.clear()
prim_cell.nets.clear()
netlist.libraries[lib_name].add_cell(prim_cell)
return netlist
def output_interchange(top, capnp_folder, part, f_logical, f_physical, f_xdc):
""" Output FPGA interchange from top level Module class object.
top (Module) - Top level module.
capnp_folder (str) - Path to the interchange capnp folder
part (str) - Part for physical netlist.
f_logical (file-like) - File to output logical_netlist.Netlist.
f_physical (file-like) - File to output physical_netlist.PhysNetlist.
"""
interchange = Interchange(capnp_folder)
hdi_primitives = Library('hdi_primitives')
work = Library('work')
libraries = {hdi_primitives.name: hdi_primitives, work.name: work}
top_cell = Cell(top.name)
# Create source cells for constant nets. They are required to have some
# name, so give them one.
#
# TODO: Iterate net names on this? This feels wrong/weird. Need to
# handle net name collisions?
constant_nets = {
0: "GLOBAL_LOGIC0",
1: "GLOBAL_LOGIC1",
}
top_cell.add_cell_instance(name='VCC', cell_name="VCC")
top_cell.add_net(constant_nets[1])
top_cell.connect_net_to_instance(
net_name=constant_nets[1], instance_name='VCC', port="P")
top_cell.add_cell_instance(name='GND', cell_name="GND")
top_cell.add_net(constant_nets[0])
top_cell.connect_net_to_instance(
net_name=constant_nets[0], instance_name='GND', port="G")
# Parse top level port names, and convert to bussed ports as needed.
create_top_level_ports(top_cell, top, top.root_in, Direction.Input)
create_top_level_ports(top_cell, top, top.root_out, Direction.Output)
create_top_level_ports(top_cell, top, top.root_inout, Direction.Inout)
for wire, width in make_bus(top.wires):
wire = unescape_verilog_name(wire)
if width is None:
top_cell.add_net(name=wire)
else:
for idx in range(width + 1):
top_cell.add_net(name='{}[{}]'.format(wire, idx))
# Update/create wire_name_net_map from the BELs.
for site in top.sites:
for bel in site.bels:
bel.make_net_map(top=top, net_map=top.wire_name_net_map)
for sink_wire, source_wire in top.wire_assigns.yield_wires():
net_name = flatten_wires(source_wire, top.wire_assigns,
top.wire_name_net_map)
if sink_wire in top.wire_name_net_map:
assert top.wire_name_net_map[sink_wire] == net_name
else:
top.wire_name_net_map[sink_wire] = net_name
# Create a list of each primative instances to later build up a primative
# model library.
hdi_primitives_cells = {}
# Create cells instances from each bel in the design.
for site in top.sites:
for bel in sorted(site.bels, key=lambda bel: bel.priority):
bel.output_interchange(
top_cell=top_cell,
top=top,
net_map=top.wire_name_net_map,
constant_nets=constant_nets,
)
if bel.parent_cell is not None:
continue
if bel.module not in hdi_primitives_cells:
hdi_primitives_cells[bel.module] = []
hdi_primitives_cells[bel.module].append(bel)
# Add top level cell to the work cell library.
work.add_cell(top_cell)
# Construct library cells based on data from top module.
for cellname in hdi_primitives_cells:
instances = hdi_primitives_cells[cellname]
cell = Cell(cellname)
ports = {}
for instance in instances:
_, connections, port_is_output = instance.create_connections(top)
for port in connections:
if port_is_output[port]:
# The current model doesn't handle IO at all, so add
# special cases for IO ports in the library.
if cellname.startswith('IOBUF') and port == "IO":
direction = Direction.Inout
else:
direction = Direction.Output
else:
direction = Direction.Input
width = connections[port].bus_width()
if port in instance.port_width:
if width is not None:
assert width <= instance.port_width[port], port
width = instance.port_width[port]
if port in ports:
port_dir, port_width = ports[port]
assert port_dir == direction, (port, direction, port_dir,
port_width)
if width is not None:
assert port_width <= width
if width > port_width:
ports[port] = (direction, width)
else:
assert port_width is None
else:
ports[port] = (direction, width)
# Add instances of unconnected ports (as needed).
for port, direction in instance.port_direction.items():
width = instance.port_width[port]
if direction == "output":
direction = Direction.Output
elif direction == "inout":
direction = Direction.Inout
else:
assert direction == "input", direction
direction = Direction.Input
if port in ports:
assert (direction, width) == ports[port]
else:
ports[port] = (direction, width)
for port, (direction, width) in ports.items():
if width is not None:
cell.add_bus_port(port, direction, start=width - 1, end=0)
else:
cell.add_port(port, direction)
hdi_primitives.add_cell(cell)
# Make sure VCC and GND primatives are in the library.
if "VCC" not in hdi_primitives.cells:
cell = Cell("VCC")
cell.add_port("P", Direction.Output)
hdi_primitives.add_cell(cell)
if "GND" not in hdi_primitives.cells:
cell = Cell("GND")
cell.add_port("G", Direction.Output)
hdi_primitives.add_cell(cell)
# Logical netlist is complete, output to file now!
logical_netlist = LogicalNetlist(
name=top.name,
property_map={},
top_instance_name=top.name,
top_instance=CellInstance(
cell_name=top.name, view='netlist', property_map={}),
libraries=libraries,
).convert_to_capnp(interchange)
write_capnp_file(logical_netlist, f_logical)
physical_netlist = PhysicalNetlist(part=part)
site_type_pins = {}
# Convert sites and bels into placement directives and physical nets.
net_stubs = {}
sub_cell_nets = {}
for site in top.sites:
physical_netlist.add_site_instance(site.site.name, site.site_type())
for bel in site.bels:
if bel.site is None or (bel.bel is None
and len(bel.physical_bels) == 0):
continue
cell_instance = unescape_verilog_name(bel.get_cell(top))
# bel.physical_bels is used to represent a transformation that
# happens from the library cell (e.g. LUT6_2) into lower
# primatives (LUT6_2 -> (LUT6, LUT5)).
#
# Rather than implement generic transformation support, for now
# models implement the transformation by adding physical bels to
# generate the correct placement constraints.
#
# TODO: Revisit this in the future?
if len(bel.physical_bels) == 0:
# Straight forward case, 1 logical Cell -> 1 physical Bel
placement = Placement(
cell_type=bel.module,
cell_name=cell_instance,
site=bel.site,
bel=bel.bel,
)
for (bel_name,
bel_pin), cell_pin in bel.bel_pins_to_cell_pins.items():
placement.add_bel_pin_to_cell_pin(
bel_pin=bel_pin,
cell_pin=cell_pin,
bel=bel_name,
)
physical_netlist.placements.append(placement)
else:
# Transformation cases, create a placement constraint for
# each bel in the physical_bels list.
#
# These represent a cell within the primative, hence the "/"
# when constructing the cell name.
for phys_bel in bel.physical_bels:
placement = Placement(
cell_type=phys_bel.module,
cell_name=cell_instance + '/' + phys_bel.name,
site=bel.site,
bel=phys_bel.bel,
)
for (bel_name, bel_pin
), cell_pin in phys_bel.bel_pins_to_cell_pins.items():
placement.add_bel_pin_to_cell_pin(
bel_pin=bel_pin,
cell_pin=cell_pin,
bel=bel_name,
)
physical_netlist.placements.append(placement)
# Convert site routing to PhysicalNetlist objects (PhysicalBelPin,
# PhysicalSitePin, PhysicalSitePip).
#
# Note: Calling output_site_routing must be done before
# output_interchange_nets to ensure that Bel.final_net_names gets
# populated, as that is computed during Site.output_site_routing.
new_nets = site.output_site_routing(
top=top,
parent_cell=top_cell,
net_map=top.wire_name_net_map,
constant_nets=constant_nets,
sub_cell_nets=sub_cell_nets)
for site_pin, site_type_pin in site.site_type_pins.items():
site_type_pins[site.site.name, site_pin] = site_type_pin
# Extend net stubs with the site routing.
for net_name in new_nets:
if net_name not in net_stubs:
net_stubs[net_name] = []
net_stubs[net_name].extend(new_nets[net_name])
# Convert top level routing nets to pip lists and to relevant nets
for net_name, pips in top.output_interchange_nets(
constant_nets=constant_nets):
if net_name not in net_stubs:
net_stubs[net_name] = []
for tile, wire0, wire1 in pips:
# TODO: Better handling of bipips?
net_stubs[net_name].append(
PhysicalPipForStitching(
tile=tile, wire0=wire0, wire1=wire1, forward=False))
net_to_type = {}
for val, net_name in constant_nets.items():
if val == 0:
net_to_type[net_name] = PhysicalNetType.Gnd
else:
assert val == 1
net_to_type[net_name] = PhysicalNetType.Vcc
cursor = top.conn.cursor()
for net_name in net_stubs:
sources = []
stubs = net_stubs[net_name]
sources, stubs = stitch_stubs(net_stubs[net_name], cursor,
site_type_pins)
physical_netlist.add_physical_net(
net_name=sub_cell_nets.get(net_name, net_name),
sources=sources,
stubs=stubs,
net_type=net_to_type.get(net_name, PhysicalNetType.Signal))
phys_netlist_capnp = physical_netlist.convert_to_capnp(interchange)
write_capnp_file(phys_netlist_capnp, f_physical)
for l in top.output_extra_tcl():
print(l, file=f_xdc)
def example_logical_netlist():
hdi_primitives = Library('hdi_primitives')
cell = Cell('FDRE')
cell.add_port('D', Direction.Input)
cell.add_port('C', Direction.Input)
cell.add_port('CE', Direction.Input)
cell.add_port('R', Direction.Input)
cell.add_port('Q', Direction.Output)
hdi_primitives.add_cell(cell)
cell = Cell('IBUF')
cell.add_port('I', Direction.Input)
cell.add_port('O', Direction.Output)
hdi_primitives.add_cell(cell)
cell = Cell('OBUF')
cell.add_port('I', Direction.Input)
cell.add_port('O', Direction.Output)
hdi_primitives.add_cell(cell)
cell = Cell('BUFG')
cell.add_port('I', Direction.Input)
cell.add_port('O', Direction.Output)
hdi_primitives.add_cell(cell)
cell = Cell('VCC')
cell.add_port('P', Direction.Output)
hdi_primitives.add_cell(cell)
cell = Cell('GND')
cell.add_port('G', Direction.Output)
hdi_primitives.add_cell(cell)
top = Cell('top')
top.add_port('i', Direction.Input)
top.add_port('clk', Direction.Input)
top.add_port('o', Direction.Output)
top.add_cell_instance('ibuf', 'IBUF')
top.add_cell_instance('obuf', 'OBUF')
top.add_cell_instance('clk_ibuf', 'IBUF')
top.add_cell_instance('clk_buf', 'BUFG')
top.add_cell_instance('ff', 'FDRE')
top.add_cell_instance('VCC', 'VCC')
top.add_cell_instance('GND', 'GND')
top.add_net('i')
top.connect_net_to_cell_port('i', 'i')
top.connect_net_to_instance('i', 'ibuf', 'I')
top.add_net('i_buf')
top.connect_net_to_instance('i_buf', 'ibuf', 'O')
top.connect_net_to_instance('i_buf', 'ff', 'D')
top.add_net('o_buf')
top.connect_net_to_instance('o_buf', 'ff', 'Q')
top.connect_net_to_instance('o_buf', 'obuf', 'I')
top.add_net('o')
top.connect_net_to_instance('o', 'obuf', 'O')
top.connect_net_to_cell_port('o', 'o')
top.add_net('clk')
top.connect_net_to_cell_port('clk', 'clk')
top.connect_net_to_instance('clk', 'clk_ibuf', 'I')
top.add_net('clk_ibuf')
top.connect_net_to_instance('clk_ibuf', 'clk_ibuf', 'O')
top.connect_net_to_instance('clk_ibuf', 'clk_buf', 'I')
top.add_net('clk_buf')
top.connect_net_to_instance('clk_buf', 'clk_buf', 'O')
top.connect_net_to_instance('clk_buf', 'ff', 'C')
top.add_net('GLOBAL_LOGIC1')
top.connect_net_to_instance('GLOBAL_LOGIC1', 'VCC', 'P')
top.connect_net_to_instance('GLOBAL_LOGIC1', 'ff', 'CE')
top.add_net('GLOBAL_LOGIC0')
top.connect_net_to_instance('GLOBAL_LOGIC0', 'GND', 'G')
top.connect_net_to_instance('GLOBAL_LOGIC0', 'ff', 'R')
work = Library('work')
work.add_cell(top)
logical_netlist = LogicalNetlist(name='top',
top_instance_name='top',
top_instance=CellInstance(
cell_name='top',
view='netlist',
property_map={},
),
property_map={},
libraries={
'work': work,
'hdi_primitives': hdi_primitives,
})
return logical_netlist