# # This file is part of LiteDRAM. # # Copyright (c) 2021 Antmicro # SPDX-License-Identifier: BSD-2-Clause import re import copy import unittest from typing import Mapping from functools import partial from collections import defaultdict from migen import * from litedram.phy.lpddr4.simphy import LPDDR4SimPHY, DoubleRateLPDDR4SimPHY from litedram.phy.lpddr4 import simsoc from litedram.phy.sim_utils import SimLogger import test.phy_common from test.phy_common import DFISequencer, PadChecker # Migen simulator supports reset signals so we could add CRG to start all the signals # in the same time, however the clock signals will still be visible in the VCD dump # and the generators we assign to them will still work before reset. For this reason we # use clocks set up in such a way that we have all the phase aligned clocks start in tick # 1 (not zero), so that we avoid any issues with clock alignment. # # NOTE: On hardware proper reset must be ensured! # # The simulation should start like this: # sys |_-------------- # sys_11_25 |___------------ # sys8x |_----____----__ # sys8x_ddr |_--__--__--__-- # sys8x_90 |___----____---- # sys8x_90_ddr |-__--__--__--__ # # sys8x_90_ddr does not trigger at the simulation start (not an edge), # BUT a generator starts before first edge, so a `yield` is needed to wait until the first # rising edge! run_simulation = partial(test.phy_common.run_simulation, clocks={ "sys": (64, 31), "sys2x": (32, 15), "sys8x": ( 8, 3), "sys8x_ddr": ( 4, 1), "sys8x_90": ( 8, 1), "sys8x_90_ddr": ( 4, 3), }) dfi_data_to_dq = partial(test.phy_common.dfi_data_to_dq, databits=16, nphases=8, burst=16) dq_pattern = partial(test.phy_common.dq_pattern, databits=16, nphases=8, burst=16) class LPDDR4Tests(unittest.TestCase): SYS_CLK_FREQ = 100e6 CMD_LATENCY = 2 def run_test(self, dut, dfi_sequence, pad_checkers: Mapping[str, Mapping[str, str]], pad_generators=None, **kwargs): # pad_checkers: {clock: {sig: values}} dfi = DFISequencer(dfi_sequence) checkers = {clk: PadChecker(dut.pads, pad_signals) for clk, pad_signals in pad_checkers.items()} generators = defaultdict(list) generators["sys"].append(dfi.generator(dut.dfi)) generators["sys"].append(dfi.reader(dut.dfi)) for clock, checker in checkers.items(): generators[clock].append(checker.run()) pad_generators = pad_generators or {} for clock, gens in pad_generators.items(): gens = gens if isinstance(gens, list) else [gens] for gen in gens: generators[clock].append(gen(dut.pads)) run_simulation(dut, generators, **kwargs) PadChecker.assert_ok(self, checkers) dfi.assert_ok(self) def test_lpddr4_cs_phase_0(self): # Test that CS is serialized correctly when sending command on phase 0 latency = '00000000' * self.CMD_LATENCY self.run_test(LPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ), dfi_sequence = [ {0: dict(cs_n=0, cas_n=0, ras_n=1, we_n=1)}, # p0: READ ], pad_checkers = {"sys8x_90": { 'cs': latency + '10100000', }}, ) def test_lpddr4_clk(self): # Test clock serialization, first few cycles are undefined so ignore them latency = 'xxxxxxxx' * self.CMD_LATENCY self.run_test(LPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ), dfi_sequence = [ {3: dict(cs_n=0, cas_n=0, ras_n=1, we_n=1)}, ], pad_checkers = {"sys8x_90_ddr": { 'clk': latency + '01010101' * 3, }}, ) def test_lpddr4_cs_multiple_phases(self): # Test that CS is serialized on different phases and that overlapping commands are handled latency = '00000000' * self.CMD_LATENCY self.run_test(LPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ), dfi_sequence = [ {0: dict(cs_n=0, cas_n=0, ras_n=1, we_n=1)}, {3: dict(cs_n=0, cas_n=0, ras_n=1, we_n=1)}, { 1: dict(cs_n=0, cas_n=0, ras_n=1, we_n=1), 4: dict(cs_n=0, cas_n=0, ras_n=1, we_n=1), # should be ignored }, { 1: dict(cs_n=0, cas_n=0, ras_n=1, we_n=1), 5: dict(cs_n=0, cas_n=0, ras_n=1, we_n=1), # should NOT be ignored }, {6: dict(cs_n=0, cas_n=0, ras_n=1, we_n=1)}, # crosses cycle boundaries {0: dict(cs_n=0, cas_n=0, ras_n=1, we_n=1)}, # should be ignored {2: dict(cs_n=1, cas_n=0, ras_n=1, we_n=1)}, # ignored due to cs_n=1 ], pad_checkers = {"sys8x_90": { 'cs': latency + ''.join([ '10100000', # p0 '00010100', # p3 '01010000', # p1, p4 ignored '01010101', # p1, p5 '00000010', # p6 (cyc 0) '10000000', # p6 (cyc 1), p0 ignored '00000000', # p2 ignored ]) }}, ) def test_lpddr4_ca_sequencing(self): # Test proper serialization of commands to CA pads and that overlapping commands are handled latency = '00000000' * self.CMD_LATENCY read = dict(cs_n=0, cas_n=0, ras_n=1, we_n=1) self.run_test(LPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ), dfi_sequence = [ {0: read, 3: read}, # p3 should be ignored {0: read, 4: read}, {6: read}, {0: read}, # ignored {7: read}, {3: read}, # not ignored ], pad_checkers = {"sys8x_90": { 'cs': latency + '10100000' + '10101010' + '00000010' + '10000000' + '00000001' + '01010100', 'ca0': latency + '00000000' + '00000000' + '00000000' + '00000000' + '00000000' + '00000000', 'ca1': latency + '10100000' + '10101010' + '00000010' + '10000000' + '00000001' + '01010100', 'ca2': latency + '00000000' + '00000000' + '00000000' + '00000000' + '00000000' + '00000000', 'ca3': latency + '0x000000' + '0x000x00' + '0000000x' + '00000000' + '00000000' + 'x000x000', 'ca4': latency + '00100000' + '00100010' + '00000000' + '10000000' + '00000000' + '01000100', 'ca5': latency + '00000000' + '00000000' + '00000000' + '00000000' + '00000000' + '00000000', }}, ) def test_lpddr4_ca_addressing(self): # Test that bank/address for different commands are correctly serialized to CA pads latency = '00000000' * self.CMD_LATENCY read = dict(cs_n=0, cas_n=0, ras_n=1, we_n=1, bank=0b101, address=0b1100110011) # actually invalid because CA[1:0] should always be 0 write_ap = dict(cs_n=0, cas_n=0, ras_n=1, we_n=0, bank=0b111, address=0b10000000000) activate = dict(cs_n=0, cas_n=1, ras_n=0, we_n=1, bank=0b010, address=0b11110000111100001) refresh_ab = dict(cs_n=0, cas_n=0, ras_n=0, we_n=1, bank=0b100, address=0b10000000000) precharge = dict(cs_n=0, cas_n=1, ras_n=0, we_n=0, bank=0b011, address=0) mrw = dict(cs_n=0, cas_n=0, ras_n=0, we_n=0, bank=0b110011, address=0b10101010) # bank=6-bit address, address=8-bit op code zqc_start = dict(cs_n=0, cas_n=1, ras_n=1, we_n=0, bank=0, address=0b1001111) # MPC with ZQCAL START operand zqc_latch = dict(cs_n=0, cas_n=1, ras_n=1, we_n=0, bank=0, address=0b1010001) # MPC with ZQCAL LATCH operand mrr = dict(cs_n=0, cas_n=1, ras_n=1, we_n=0, bank=1, address=0b101101) # 6-bit address (bank=1 selects MRR) for masked_write in [True, False]: with self.subTest(masked_write=masked_write): wr_ca3 = '{}x00'.format('0' if not masked_write else '1') self.run_test(LPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ, masked_write=masked_write), dfi_sequence = [ {0: read, 4: write_ap}, {0: activate, 4: refresh_ab}, {0: precharge, 4: mrw}, {0: zqc_start, 4: zqc_latch}, {0: mrr}, ], pad_checkers = {"sys8x_90": { # note that refresh and precharge have a single command so these go as cmd2 # here MRR CAS-2 is sent with C[8:2] also taken from dfi.address, but this should have no influence # rd wr act ref pre mrw zqcs zqcl mrr 'cs': latency + '1010'+'1010' + '1010'+'0010' + '0010'+'1010' + '0010'+'0010' + '1010'+'0000', 'ca0': latency + '0100'+'0100' + '1011'+'0000' + '0001'+'0100' + '0001'+'0001' + '0101'+'0000', 'ca1': latency + '1010'+'0110' + '0110'+'0000' + '0001'+'1111' + '0001'+'0000' + '1011'+'0000', 'ca2': latency + '0101'+'1100' + '0010'+'0001' + '0000'+'1010' + '0001'+'0000' + '1100'+'0000', 'ca3': latency + '0x01'+wr_ca3 + '1110'+'001x' + '000x'+'0001' + '0001'+'0000' + '1101'+'0000', 'ca4': latency + '0110'+'0010' + '1010'+'000x' + '001x'+'0110' + '0000'+'0001' + '0010'+'0000', 'ca5': latency + '0010'+'0100' + '1001'+'001x' + '000x'+'1101' + '0010'+'0010' + 'x100'+'0000', }}, ) def test_lpddr4_command_overlaps(self): # Test command overlap protection (can happen only if controller violates timings) latency = '00000000' * self.CMD_LATENCY read = dict(cs_n=0, cas_n=0, ras_n=1, we_n=1) dfi_sequence = [ # p2 always ignored: # 1111 # 1111 # 1111 {0: read, 2: read, 6: read}, {}, # p2 or both p2 and p4 ignored, depending on extended_overlaps_check # 1111 # 1111 # 1111 {0: read, 2: read, 4: read}, ] for extended_check in [False, True]: with self.subTest(extended_check=extended_check): phy = LPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ, extended_overlaps_check=extended_check) pads = { False: {'cs': latency + '10100010'+'10000000'+'10100000'}, # last cycle: p2 and p4 ignored True: {'cs': latency + '10100010'+'10000000'+'10101010'}, # last cycle: only p2 ignored }[extended_check] self.run_test(phy, dfi_sequence = dfi_sequence, pad_checkers = {"sys8x_90": pads}, ) def test_lpddr4_command_pads(self): # Test serialization of DFI command pins (cs/cke/odt/reset_n) latency = '00000000' * self.CMD_LATENCY read = dict(cs_n=0, cas_n=0, ras_n=1, we_n=1) self.run_test(LPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ), dfi_sequence = [ { 0: dict(cke=1, odt=1, reset_n=1, **read), 7: dict(cke=0, odt=1, reset_n=1, **read), }, { 3: dict(cke=1, odt=0, reset_n=0, **read), } ], pad_checkers = {"sys8x_90": { 'cs': latency + '10100001' + '01010100', 'cke': latency + '10000000' + '00010000', 'odt': latency + '10000001' + '00000000', 'reset_n': latency + '11111111' + '11101111', }}, ) def test_lpddr4_dq_out(self): # Test serialization of dfi wrdata to DQ pads dut = LPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ) zero = '00000000' * 2 # zero for 1 sysclk clock in sys8x_ddr clock domain dfi_data = { 0: dict(wrdata=0x11112222), 1: dict(wrdata=0x33334444), 2: dict(wrdata=0x55556666), 3: dict(wrdata=0x77778888), 4: dict(wrdata=0x9999aaaa), 5: dict(wrdata=0xbbbbcccc), 6: dict(wrdata=0xddddeeee), 7: dict(wrdata=0xffff0000), } dfi_wrdata_en = {0: dict(wrdata_en=1)} # wrdata_en=1 required on any single phase self.run_test(dut, dfi_sequence = [dfi_wrdata_en, {}, dfi_data], pad_checkers = {"sys8x_90_ddr": { f'dq{i}': (self.CMD_LATENCY+1)*zero + zero + dq_pattern(i, dfi_data, "wrdata") + zero for i in range(16) }}, ) def test_lpddr4_dq_only_1cycle(self): # Test that DQ data is sent to pads only during expected cycle, on other cycles there is no data dut = LPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ) zero = '00000000' * 2 dfi_data = { 0: dict(wrdata=0x11112222), 1: dict(wrdata=0x33334444), 2: dict(wrdata=0x55556666), 3: dict(wrdata=0x77778888), 4: dict(wrdata=0x9999aaaa), 5: dict(wrdata=0xbbbbcccc), 6: dict(wrdata=0xddddeeee), 7: dict(wrdata=0xffff0000), } dfi_wrdata_en = copy.deepcopy(dfi_data) dfi_wrdata_en[0].update(dict(wrdata_en=1)) self.run_test(dut, dfi_sequence = [dfi_wrdata_en, dfi_data, dfi_data], pad_checkers = {"sys8x_90_ddr": { f'dq{i}': (self.CMD_LATENCY+1)*zero + zero + dq_pattern(i, dfi_data, "wrdata") + zero for i in range(16) }}, ) def test_lpddr4_dqs(self): # Test serialization of DQS pattern in relation to DQ data, with proper preamble and postamble zero = '00000000' * 2 self.run_test(LPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ), dfi_sequence = [ {0: dict(wrdata_en=1)}, {}, { # to get 10101010... pattern on dq0 and only 1s on others 0: dict(wrdata=0xfffeffff), 1: dict(wrdata=0xfffeffff), 2: dict(wrdata=0xfffeffff), 3: dict(wrdata=0xfffeffff), 4: dict(wrdata=0xfffeffff), 5: dict(wrdata=0xfffeffff), 6: dict(wrdata=0xfffeffff), 7: dict(wrdata=0xfffeffff), }, ], pad_checkers = { "sys8x_90_ddr": { 'dq0': (self.CMD_LATENCY+1)*zero + '00000000'+'00000000' + '10101010'+'10101010' + '00000000'+'00000000' + zero, 'dq1': (self.CMD_LATENCY+1)*zero + '00000000'+'00000000' + '11111111'+'11111111' + '00000000'+'00000000' + zero, }, "sys8x_ddr": { # preamble, pattern, preamble 'dqs0': (self.CMD_LATENCY+1)*zero + '01010101'+'00000101' + '01010101'+'01010101' + '00010101'+'01010101' + zero, 'dqs1': (self.CMD_LATENCY+1)*zero + '01010101'+'00000101' + '01010101'+'01010101' + '00010101'+'01010101' + zero, } }, ) def test_lpddr4_dmi_no_mask(self): # Test proper output on DMI pads. We don't implement masking now, so nothing should be sent to DMI pads zero = '00000000' * 2 self.run_test(LPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ), dfi_sequence = [ {0: dict(wrdata_en=1)}, {}, { 0: dict(wrdata=0xffffffff), 1: dict(wrdata=0xffffffff), 2: dict(wrdata=0xffffffff), 3: dict(wrdata=0xffffffff), 4: dict(wrdata=0xffffffff), 5: dict(wrdata=0xffffffff), 6: dict(wrdata=0xffffffff), 7: dict(wrdata=0xffffffff), }, ], pad_checkers = { "sys8x_90_ddr": { 'dq0': (self.CMD_LATENCY+1)*zero + zero + '11111111'+'11111111' + 2*zero, }, "sys8x_ddr": { 'dmi0': (self.CMD_LATENCY+1)*zero + (3 + 1)*zero, 'dmi1': (self.CMD_LATENCY+1)*zero + (3 + 1)*zero, } }, ) def test_lpddr4_dq_in_rddata_valid(self): # Test that rddata_valid is set with correct delay read_latency = 9 # settings.read_latency dfi_sequence = [ {0: dict(rddata_en=1)}, # command is issued by MC (appears on next cycle) *[{p: dict(rddata_valid=0) for p in range(8)} for _ in range(read_latency - 1)], # nothing is sent during write latency {p: dict(rddata_valid=1) for p in range(8)}, {}, ] self.run_test(LPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ), dfi_sequence = dfi_sequence, pad_checkers = {}, pad_generators = {}, ) def test_lpddr4_dq_in_rddata(self): # Test that data on DQ pads is deserialized correctly to DFI rddata. # We assume that when there are no commands, PHY will still still deserialize the data, # which is generally true (tristate oe is 0 whenever we are not writing). dfi_data = { 0: dict(rddata=0x11112222), 1: dict(rddata=0x33334444), 2: dict(rddata=0x55556666), 3: dict(rddata=0x77778888), 4: dict(rddata=0x9999aaaa), 5: dict(rddata=0xbbbbcccc), 6: dict(rddata=0xddddeeee), 7: dict(rddata=0xffff0000), } def sim_dq(pads): for _ in range(16 * 1): # wait 1 sysclk cycle yield for cyc in range(16): # send a burst of data on pads for bit in range(16): yield pads.dq_i[bit].eq(int(dq_pattern(bit, dfi_data, "rddata")[cyc])) yield for bit in range(16): yield pads.dq_i[bit].eq(0) yield read_des_delay = 3 # phy.read_des_delay dfi_sequence = [ {}, # wait 1 sysclk cycle *[{} for _ in range(read_des_delay)], dfi_data, {}, ] self.run_test(LPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ), dfi_sequence = dfi_sequence, pad_checkers = {}, pad_generators = { "sys8x_90_ddr": sim_dq, }, ) def test_lpddr4_cmd_write(self): # Test whole WRITE command sequence verifying data on pads and write_latency from MC perspective for masked_write in [True, False]: with self.subTest(masked_write=masked_write): phy = LPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ, masked_write=masked_write) zero = '00000000' * 2 write_latency = phy.settings.write_latency wrphase = phy.settings.wrphase.reset.value dfi_data = { 0: dict(wrdata=0x11112222), 1: dict(wrdata=0x33334444), 2: dict(wrdata=0x55556666), 3: dict(wrdata=0x77778888), 4: dict(wrdata=0x9999aaaa), 5: dict(wrdata=0xbbbbcccc), 6: dict(wrdata=0xddddeeee), 7: dict(wrdata=0xffff0000), } dfi_sequence = [ {wrphase: dict(cs_n=0, cas_n=0, ras_n=1, we_n=0, wrdata_en=1)}, *[{} for _ in range(write_latency - 1)], dfi_data, {}, {}, {}, {}, {}, ] wr_ca3 = "0000{}000".format('0' if not masked_write else '1') self.run_test(phy, dfi_sequence = dfi_sequence, pad_checkers = { "sys8x_90": { "cs": "00000000"*2 + "00001010" + "00000000"*2, "ca0": "00000000"*2 + "00000000" + "00000000"*2, "ca1": "00000000"*2 + "00000010" + "00000000"*2, "ca2": "00000000"*2 + "00001000" + "00000000"*2, "ca3": "00000000"*2 + wr_ca3 + "00000000"*2, "ca4": "00000000"*2 + "00000010" + "00000000"*2, "ca5": "00000000"*2 + "00000000" + "00000000"*2, }, "sys8x_90_ddr": { f'dq{i}': (self.CMD_LATENCY+1)*zero + zero + dq_pattern(i, dfi_data, "wrdata") + zero for i in range(16) }, "sys8x_ddr": { "dqs0": (self.CMD_LATENCY+1)*zero + '01010101'+'00000101' + '01010101'+'01010101' + '00010101'+'01010101' + zero, }, }, ) def test_lpddr4_cmd_read(self): # Test whole READ command sequence simulating DRAM response and verifying read_latency from MC perspective phy = LPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ) zero = '00000000' * 2 read_latency = phy.settings.read_latency rdphase = phy.settings.rdphase.reset.value # FIXME: The data will appear 1 cycle before rddata_valid. This is because we have one more cycle # of read latency that is needed for bitslips to be usable, and here we're not doing read leveling # so the bitslip is configured incorrectly. If we increased cl by 1 in Simulator and did a single # bitslip increment before the test, it should work, but this would unnecessarily complicate the test. dfi_data = { 0: dict(rddata=0x11112222), 1: dict(rddata=0x33334444), 2: dict(rddata=0x55556666), 3: dict(rddata=0x77778888), 4: dict(rddata=0x9999aaaa), 5: dict(rddata=0xbbbbcccc), 6: dict(rddata=0xddddeeee), 7: dict(rddata=0xffff0000), } dfi_data_valid = { 0: dict(rddata_valid=1), 1: dict(rddata_valid=1), 2: dict(rddata_valid=1), 3: dict(rddata_valid=1), 4: dict(rddata_valid=1), 5: dict(rddata_valid=1), 6: dict(rddata_valid=1), 7: dict(rddata_valid=1), } dfi_sequence = [ {rdphase: dict(cs_n=0, cas_n=0, ras_n=1, we_n=1, rddata_en=1)}, *[{} for _ in range(read_latency - 1 - 1)], dfi_data, dfi_data_valid, {}, {}, {}, {}, ] class Simulator: def __init__(self, dfi_data, test_case, cl): self.dfi_data = dfi_data self.read_cmd = False self.test_case = test_case self.cl = cl @passive def cmd_checker(self, pads): # Monitors CA/CS for a READ command read = [ 0b000010, # READ-1 (1) BL=0 0b000000, # READ-1 (2) BA=0, C9=0, AP=0 0b010010, # CAS-2 (1) C8=0 0b000000, # CAS-2 (2) C=0 ] def check_ca(i): err = "{}: CA = 0b{:06b}, expected = 0b{:06b}".format(i, (yield pads.ca), read[i]) self.test_case.assertEqual((yield pads.ca), read[i], msg=err) while True: while not (yield pads.cs): yield yield from check_ca(0) yield yield from check_ca(1) yield self.test_case.assertEqual((yield pads.cs), 1, msg="Found CS on 1st cycle but not on 3rd cycle") yield from check_ca(2) yield yield from check_ca(3) self.read_cmd = True @passive def dq_generator(self, pads): # After a READ command is received, wait CL and send data while True: while not self.read_cmd: yield dfi_data = self.dfi_data.pop(0) for _ in range(2*self.cl + 1): yield self.read_cmd = False for cyc in range(16): for bit in range(16): yield pads.dq_i[bit].eq(int(dq_pattern(bit, dfi_data, "rddata")[cyc])) yield for bit in range(16): yield pads.dq_i[bit].eq(0) @passive def dqs_generator(self, pads): # After a READ command is received, wait CL and send data strobe while True: while not self.read_cmd: yield for _ in range(2*self.cl - 1): # DQS to transmit DQS preamble yield for cyc in range(16 + 1): # send a burst of data on pads for bit in range(2): yield pads.dqs_i[bit].eq(int((cyc + 1) % 2)) yield for bit in range(2): yield pads.dqs_i[bit].eq(0) sim = Simulator([dfi_data], self, cl=14) self.run_test(phy, dfi_sequence = dfi_sequence, pad_checkers = { "sys8x_90": { "cs": "00000000"*2 + rdphase*"0" + "1010" + "00000000"*2, "ca0": "00000000"*2 + rdphase*"0" + "0000" + "00000000"*2, "ca1": "00000000"*2 + rdphase*"0" + "1010" + "00000000"*2, "ca2": "00000000"*2 + rdphase*"0" + "0000" + "00000000"*2, "ca3": "00000000"*2 + rdphase*"0" + "0000" + "00000000"*2, "ca4": "00000000"*2 + rdphase*"0" + "0010" + "00000000"*2, "ca5": "00000000"*2 + rdphase*"0" + "0000" + "00000000"*2, }, "sys8x_90_ddr": { #? f'dq{i}': (self.CMD_LATENCY+2)*zero + zero + dq_pattern(i, dfi_data, "rddata") + zero for i in range(16) }, "sys8x_ddr": { "dqs0": (self.CMD_LATENCY+2)*zero + '00000000'+'00000001' + '01010101'+'01010101' + zero, }, }, pad_generators = { "sys8x_ddr": [sim.dq_generator, sim.dqs_generator], "sys8x_90": sim.cmd_checker, }, ) def test_lpddr4_double_rate_phy_write(self): # Verify that double rate PHY works as normal one with half sys clock more latency phy = DoubleRateLPDDR4SimPHY(sys_clk_freq=self.SYS_CLK_FREQ, serdes_reset_cnt=-1) zero = '00000000' * 2 # DDR half = '0000' # double rate PHY introduces latency of 4 sys8x clocks init_ddr_latency = (self.CMD_LATENCY + 1) * zero + half*2 # half*2 for DDR write_latency = phy.settings.write_latency wrphase = phy.settings.wrphase.reset.value dfi_data = { 0: dict(wrdata=0x11112222), 1: dict(wrdata=0x33334444), 2: dict(wrdata=0x55556666), 3: dict(wrdata=0x77778888), 4: dict(wrdata=0x9999aaaa), 5: dict(wrdata=0xbbbbcccc), 6: dict(wrdata=0xddddeeee), 7: dict(wrdata=0xffff0000), } dfi_sequence = [ {wrphase: dict(cs_n=0, cas_n=0, ras_n=1, we_n=0, wrdata_en=1)}, *[{} for _ in range(write_latency - 1)], dfi_data, {}, {}, {}, {}, {}, ] self.run_test(phy, dfi_sequence = dfi_sequence, pad_checkers = { "sys8x_90": { "cs": half + "00000000"*2 + "00001010" + "00000000"*2, "ca0": half + "00000000"*2 + "00000000" + "00000000"*2, "ca1": half + "00000000"*2 + "00000010" + "00000000"*2, "ca2": half + "00000000"*2 + "00001000" + "00000000"*2, "ca3": half + "00000000"*2 + "00001000" + "00000000"*2, "ca4": half + "00000000"*2 + "00000010" + "00000000"*2, "ca5": half + "00000000"*2 + "00000000" + "00000000"*2, }, "sys8x_90_ddr": { f'dq{i}': init_ddr_latency + zero + dq_pattern(i, dfi_data, "wrdata") + zero for i in range(16) }, "sys8x_ddr": { "dqs0": init_ddr_latency + '01010101'+'00000101' + '01010101'+'01010101' + '00010101'+'01010101' + zero, }, }, ) class VerilatorLPDDR4Tests(unittest.TestCase): # We ignore these 2 warnings, they appear due to the fact that litedram starts # in hardware control mode which holds reset_n=1 all the time. PHY will later # set reset_n=0 once again and then perform proper init sequence. ALLOWED = [ ("WARN", "tINIT1 violated: RESET deasserted too fast"), ("WARN", "tINIT3 violated: CKE set HIGH too fast after RESET being released"), ] def check_logs(self, logs): for match in SimLogger.LOG_PATTERN.finditer(logs): if match.group("level") in ["WARN", "ERROR"]: allowed = any( lvl == match.group("level") and msg in match.group("msg") for lvl, msg in self.ALLOWED ) self.assertTrue(allowed, msg=match.group(0)) def run_test(self, args, **kwargs): import pexpect command = ["python3", simsoc.__file__, *args] timeout = 12 * 60 # give more than enough time p = pexpect.spawn(" ".join(command), timeout=timeout, **kwargs) res = p.expect(["Memtest OK", "Memtest KO"]) self.assertEqual(res, 0, msg="{}\nGot '{}'".format(p.before.decode(), p.after.decode())) self.check_logs(p.before.decode()) def test_lpddr4_sim_x2rate_no_cache(self): # Test simulation with regular delays, intermediate serialization stage, # refresh and no L2 cache (masked write must work) self.run_test([ "--finish-after-memtest", "--log-level", "warn", "--output-dir", "build/test_lpddr4_sim_x2rate_no_cache", "--double-rate-phy", "--l2-size", "0", "--no-refresh", # FIXME: LiteDRAM sends refresh commands when only MRW/MRR are allowed ]) def test_lpddr4_sim_fast(self): # Fast test of simulation with L2 cache (so no data masking is required) self.run_test([ "--finish-after-memtest", "--log-level", "warn", "--output-dir", "build/test_lpddr4_sim_fast", "--disable-delay", "--no-refresh", ])