Modified for use with pinmux, will probably change the class name later.
"""
-from random import randint
-from math import ceil, floor
+from random import randint, shuffle
+#from math import ceil, floor
from nmigen import Elaboratable, Module, Signal, Record, Array, Cat
from nmigen.hdl.rec import Layout
from nmigen.utils import log2_int
from nmigen.cli import rtlil
-from soc.minerva.wishbone import make_wb_layout
+#from soc.minerva.wishbone import make_wb_layout
from nmutil.util import wrap
-from soc.bus.test.wb_rw import wb_read, wb_write
+#from soc.bus.test.wb_rw import wb_read, wb_write
from nmutil.gtkw import write_gtkw
cxxsim = False
if cxxsim:
- from nmigen.sim.cxxsim import Simulator, Settle
+ from nmigen.sim.cxxsim import Simulator, Settle, Delay
else:
- from nmigen.sim import Simulator, Settle
+ from nmigen.sim import Simulator, Settle, Delay
io_layout = (("i", 1),
("oe", 1),
("o", 1)
)
+# This block produces an N-to-1 mux with N 3-bit bank ports and one pad port.
+# The bank ports are intended to be wired to peripheral functions,
+# while the pad port will connect to the I/O pad.
+# Each port has o/oe/i signals, and the bank signal is used to select
+# between the bank ports.
class IOMuxBlockSingle(Elaboratable):
- def __init__(self):
+ def __init__(self, n_banks=4):
print("1-bit IO Mux Block")
- self.n_banks = 4
+ self.n_banks = n_banks
self.bank = Signal(log2_int(self.n_banks))
temp = []
for i in range(self.n_banks):
- temp_str = "bank{}".format(i)
- temp.append(Record(name=temp_str, layout=io_layout))
+ name = "bank%d" % i
+ temp.append(Record(name=name, layout=io_layout))
self.bank_ports = Array(temp)
self.out_port = Record(name="IO", layout=io_layout)
- #self.b0 = Record(name="b0", layout=io_layout)
- #self.b1 = Record(name="b1", layout=io_layout)
-
def elaborate(self, platform):
m = Module()
comb, sync = m.d.comb, m.d.sync
bank = self.bank
bank_ports = self.bank_ports
- #b0 = self.b0
- #b1 = self.b1
out_port = self.out_port
- sync += out_port.o.eq(bank_ports[0].o)
- sync += out_port.oe.eq(bank_ports[0].oe)
- sync += bank_ports[0].i.eq(out_port.i)
-
# Connect IO Pad output port to one of the peripheral IOs
# Connect peripheral inputs to the IO pad input
+ comb += self.out_port.o.eq(self.bank_ports[bank].o)
+ comb += self.out_port.oe.eq(self.bank_ports[bank].oe)
+
+ comb += self.bank_ports[bank].i.eq(self.out_port.i)
- bank_range = range(self.n_banks)
- # const
- BANK0_WB = 0
- BANK1_P1 = 1
- BANK2_P2 = 2
- BANK3_P3 = 3
-
- with m.Switch(bank):
- with m.Case(BANK0_WB):
- self.connect_bank_to_io(sync, BANK0_WB)
- with m.Case(BANK1_P1):
- self.connect_bank_to_io(sync, BANK1_P1)
- with m.Case(BANK2_P2):
- self.connect_bank_to_io(sync, BANK2_P2)
- with m.Case(BANK3_P3):
- self.connect_bank_to_io(sync, BANK3_P3)
return m
def connect_bank_to_io(self, domain, bank_arg):
domain += self.out_port.oe.eq(self.bank_ports[bank_arg].oe)
domain += self.bank_ports[bank_arg].i.eq(self.out_port.i)
- temp_list = list(range(self.n_banks))
- temp_list.pop(temp_list.index(bank_arg))
- print("Banks with input hardwired to 0: {}".format(temp_list))
- for j in range(len(temp_list)):
- unused_bank = temp_list[j]
- domain += self.bank_ports[unused_bank].i.eq(0)
-
def __iter__(self):
""" Get member signals for Verilog form. """
for field in self.out_port.fields.values():
yield field
- for bank in range(len(self.bank_ports)):
+ for bank in range(self.n_banks):
for field in self.bank_ports[bank].fields.values():
yield field
yield self.bank
def ports(self):
return list(self)
+# Method to test a particular bank port
+# when rand_order is True, previous and consecutive banks are
+# random (but NOT equal to given bank)
+def test_single_bank(dut, bank, rand_order=True, delay=1e-6):
+ if rand_order:
+ print("Randomising the prev and next banks")
+ prev_bank=bank
+ while(prev_bank == bank):
+ prev_bank = randint(0, dut.n_banks-1)
+ next_bank=bank
+ while(next_bank == bank):
+ next_bank = randint(0, dut.n_banks-1)
+ else:
+ # Set the prev and next banks as consecutive banks
+ if bank == 0:
+ prev_bank = dut.n_banks - 1
+ else:
+ prev_bank = bank - 1
+
+ if bank == dut.n_banks:
+ next_bank = 0
+ else:
+ next_bank = bank + 1
+
+ print("Prev=%d, Given=%d, Next=%d" % (prev_bank, bank, next_bank))
+
+ # Clear o/oe, delay, set port i
+ # Set to previous bank, delay
+ # Assert bank i == 0
+ # Set to desired bank
+ # Assert bank i == 1
+ # Set o/oe, delay
+ # Assert o, oe == 1
+ # Set to next bank, delay
+ # Assert bank i == 0
+ yield dut.bank_ports[bank].o.eq(0)
+ yield Delay(delay)
+ yield dut.bank_ports[bank].oe.eq(0)
+ yield Delay(delay)
+ yield dut.out_port.i.eq(1)
+ yield Delay(delay)
+
+ yield dut.bank.eq(prev_bank)
+ yield Delay(delay)
+
+ test_i = yield dut.bank_ports[bank].i
+ assert(test_i == 0)
+
+ yield dut.bank.eq(bank)
+ yield Delay(delay)
+
+ test_o = yield dut.out_port.o
+ test_oe = yield dut.out_port.oe
+ test_i = yield dut.bank_ports[bank].i
+ assert(test_o == 0)
+ assert(test_oe == 0)
+ assert(test_i == 1)
+
+ yield dut.bank_ports[bank].o.eq(1)
+ yield Delay(delay)
+ yield dut.bank_ports[bank].oe.eq(1)
+ yield Delay(delay)
+
+ test_o = yield dut.out_port.o
+ test_oe = yield dut.out_port.oe
+ assert(test_o == 1)
+ assert(test_oe == 1)
+
+ yield dut.bank.eq(next_bank)
+ yield Delay(delay)
+
+ test_i = yield dut.bank_ports[bank].i
+ assert(test_i == 0)
+
+def test_iomux(dut, rand_order=True):
+ print("------START----------------------")
+ #print(dir(dut.bank_ports[0]))
+ #print(dut.bank_ports[0].fields)
+
+ # Produce a test list of bank values
+ test_bank_vec = list(range(0, dut.n_banks))
+ #print(test_bank_vec)
+ # Randomise for wider testing
+ if rand_order:
+ shuffle(test_bank_vec)
+ #print(test_bank_vec)
+ for i in range(dut.n_banks):
+ yield from test_single_bank(dut, test_bank_vec[i], rand_order)
+
+ print("Finished the 1-bit IO mux block test!")
+
def gen_gtkw_doc(module_name, n_banks, filename):
# GTKWave doc generation
style = {
# Create a trace list, each block expected to be a tuple()
traces = []
for bank in range(0, n_banks):
- temp_traces = ('Bank{}'.format(bank), [
- ('bank{}__i'.format(bank), 'in'),
- ('bank{}__o'.format(bank), 'out'),
- ('bank{}__oe'.format(bank), 'out')
+ temp_traces = ('Bank%d' % bank, [
+ ('bank%d__i' % bank, 'in'),
+ ('bank%d__o' % bank, 'out'),
+ ('bank%d__oe' % bank, 'out')
])
traces.append(temp_traces)
temp_traces = ('Misc', [
- ('clk'),
- ('bank[1:0]', 'in')
+ ('bank[%d:0]' % ((n_banks-1).bit_length()-1), 'in')
])
traces.append(temp_traces)
temp_traces = ('IO port to pad', [
write_gtkw(filename+".gtkw", filename+".vcd", traces, style,
module=module_name)
-def sim_iomux():
- filename = "test_pinmux" # Doesn't include extension
- dut = IOMuxBlockSingle()
+def sim_iomux(rand_order=True):
+ filename = "test_iomux" # Doesn't include extension
+ n_banks = 8
+ dut = IOMuxBlockSingle(n_banks)
vl = rtlil.convert(dut, ports=dut.ports())
with open(filename+".il", "w") as f:
f.write(vl)
m.submodules.pinmux = dut
sim = Simulator(m)
- sim.add_clock(1e-6)
- sim.add_sync_process(wrap(test_iomux(dut)))
+ sim.add_process(wrap(test_iomux(dut, rand_order)))
sim_writer = sim.write_vcd(filename+".vcd")
with sim_writer:
sim.run()
gen_gtkw_doc("top.pinmux", dut.n_banks, filename)
-def test_iomux(dut):
- print("------START----------------------")
- #print(dir(dut.bank_ports[0]))
- #print(dut.bank_ports[0].fields)
-
- # TODO: turn into methods
- yield dut.bank_ports[0].o.eq(1)
- yield dut.bank.eq(0)
- yield
- yield dut.bank_ports[0].o.eq(1)
- yield
- yield dut.bank_ports[1].o.eq(1)
- yield
- yield dut.bank_ports[0].oe.eq(1)
- yield
- yield dut.bank.eq(1)
- yield
-
- yield dut.bank_ports[0].o.eq(0)
- yield
- yield dut.bank_ports[1].o.eq(0)
- yield
- yield dut.bank_ports[1].oe.eq(1)
- yield
- yield dut.bank.eq(0)
- yield
-
- yield dut.bank.eq(1)
- yield
- yield dut.bank_ports[1].o.eq(1)
- yield
- yield dut.bank_ports[2].o.eq(1)
- yield
- yield dut.bank_ports[1].oe.eq(1)
- yield
- yield dut.bank.eq(2)
- yield
-
- yield dut.bank_ports[1].o.eq(0)
- yield
- yield dut.bank_ports[2].o.eq(0)
- yield
- yield dut.bank_ports[2].oe.eq(1)
- yield
- yield dut.bank.eq(0)
- yield
- print("Finished the 1-bit IO mux block test!")
if __name__ == '__main__':
- sim_iomux()
+ sim_iomux(rand_order=True)
projects / pinmux.git / blobdiff