Ayaz Akram has submitted this change. (
https://gem5-review.googlesource.com/c/public/gem5/+/68257?usp=email )
Change subject: mem: Add a DDR5 memory interface
......................................................................
mem: Add a DDR5 memory interface
This change adds a single DDR5 memory inteface.
A DDR5 DIMM contains two physical channels. Therefore,
two instances of this interface should be used to model
a DDR5 DIMM. The configuration includes 3 different speed
bins models. The configuration is tested with different
types of memory traffic using the traffic generator and shows
performance similar to what is observed in existing
literature [1]. One of the key features of DDR5
"same bank refresh" is yet not supported in gem5, but is
expected to improve the performance of the DDR5 model.
[1] Exploration of DDR5 with the Open-Source Simulator DRAMSys.
Change-Id: I5856a10c8dcd92dbecc7fd4dcea0f674b2412dd7
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/68257
Maintainer: Jason Lowe-Power <power...@gmail.com>
Reviewed-by: Jason Lowe-Power <power...@gmail.com>
Tested-by: kokoro <noreply+kok...@google.com>
---
M src/mem/DRAMInterface.py
M src/python/SConscript
M src/python/gem5/components/memory/__init__.py
A src/python/gem5/components/memory/dram_interfaces/ddr5.py
M src/python/gem5/components/memory/single_channel.py
5 files changed, 588 insertions(+), 7 deletions(-)
Approvals:
Jason Lowe-Power: Looks good to me, approved; Looks good to me, approved
kokoro: Regressions pass
diff --git a/src/mem/DRAMInterface.py b/src/mem/DRAMInterface.py
index 9c041e5..dea62a6 100644
--- a/src/mem/DRAMInterface.py
+++ b/src/mem/DRAMInterface.py
@@ -41,6 +41,7 @@
from m5.objects.MemCtrl import MemCtrl
from m5.objects.MemInterface import *
+
# Enum for the page policy, either open, open_adaptive, close, or
# close_adaptive.
class PageManage(Enum):
@@ -1179,7 +1180,6 @@
# on HBM gen2 specifications. 4H stack, 8Gb per die and total capacity
# of 4GiB.
class HBM_2000_4H_1x64(DRAMInterface):
-
# 64-bit interface for a single pseudo channel
device_bus_width = 64
@@ -1256,6 +1256,268 @@
two_cycle_activate = True
+# A single DDR5-4400 32bit channel (4x8 configuration)
+# A DDR5 DIMM is made up of two (32 bit) channels.
+# Following configuration is modeling only a single 32bit channel.
+# Timings are based on Micron data sheet:
+# https://media-www.micron.com/-/media/client/global/
+# documents/products/data-sheet/dram/ddr5/ddr5_sdram_core.pdf
+# Configuration: 4Gbx8 devices (32Gb addressing)
+# Maximum bandwidth of DDR5_4400_4x8 (4400 MT/s) can be 17.6GB/s
+class DDR5_4400_4x8(DRAMInterface):
+ # size of a single device
+ device_size = "512MiB"
+
+ # single channel of 32bit width
+ # requires 8-bit wide 4 devices
+ device_bus_width = 8
+
+ # DDR5 is a BL16 device
+ burst_length = 16
+
+ # Each device has a page (row buffer) size of 256B
+ # Four devices lead to a page size of 1KB
+ device_rowbuffer_size = "256B"
+
+ # 4Gbx8 configuration
+ devices_per_rank = 4
+
+ ranks_per_channel = 1
+
+ # 4Gbx8 configuration of DDR5 has 8 bank groups,
+ # 4 banks per bank group and 32 banks in total
+ bank_groups_per_rank = 8
+ banks_per_rank = 32
+
+ write_buffer_size = 64
+ read_buffer_size = 64
+
+ # For 4400 MT/s
+ tCK = "0.454ns"
+
+ # 16 beats across an x32 interface translates to 8 clocks @ 2200 MHz
+ tBURST = "3.632ns"
+
+ # For 4400 MT/s, the number is max(8nCK, 5ns)
+ tCCD_L = "5ns"
+
+ # page 389 of the data sheet
+ tRCD = "14.545ns"
+ tCL = "14.545ns"
+ # tCWL = tCL - 2(nCK)
+ tCWL = "13.637ns"
+ tRP = "14.545ns"
+ tRAS = "32ns"
+
+ # RRD_S (different bank group) : 8nCK
+ tRRD = "3.632ns"
+
+ # RRD_L (same bank group) is MAX(8nCK, 5ns) for 1KB page
+ tRRD_L = "5ns"
+
+ # tFAW for 1KB page is MAX(32nCK, 14.545ns)
+ tXAW = "14.545ns"
+ activation_limit = 4
+
+ # Note: could not find the rank to rank delay
+ # from the datasheet, but, since we are modeling
+ # a single rank device, it should not matter.
+ # Using the DDR4 number as default (i.e. ~2tCK)
+ tCS = "1ns"
+
+ # tRFC (Normal) for 16Gb device is 295ns
+ tRFC = "295ns"
+
+ tPPD = "0.908ns" # 2nCK
+ tWR = "30ns"
+
+ # Rd/Wr turnaround timings
+ ###################################################################
+ # Note: gem5 adds tBURST separately while calculting rd--rd/wr or
+ # wr--wr/rd delays so we can ignore tBURST factor from the following
+ # equations while calculating the final value of the timing parameter
+ ####################################################################
+ # From the datasheet
+ # (1) tCCD_L_RTW =
+ # CL - CWL + RBL/2 + 2 tCK - (Read DQS offset) + (tRPST - 0.5 tCK) +
tWPRE
+ # where CWL = CL-2, RBL/2 = tBURST, Read DQS offset = 1ck, tRPST =
1.5tCK
+ # Therefore, tCCD_L_RTW =
+ # (14.545 - 13.637) + (2*0.454) - 0.454 +
+ # ((1.5*0.454)-(0.5*0.454) + (1.5*0.454) = 2.497ns
+
+ # (2) tCCD_S_RTW =
+ # CL - CWL + RBL/2 + 2 tCK - (Read DQS offset) + (tRPST - 0.5 tCK) +
tWPRE
+ # Therefore, tCCD_S_RTW = tCCD_L_RTW = 2.497ns
+
+ # (3) tCCD_L_WTR =
+ # CWL + WBL/2 + max(16nCK,10ns)
+ # where WBL/2 = tBURST
+ # Therefore,
+ # tCCD_L_WTR = 13.637+10 = 23.637ns
+
+ # (4) tCCD_S_WTR =
+ # CWL + WBL/2 + max(4nCK,2.5ns)
+ # where WBL/2 = tBURST
+ # Therefore,
+ # tCCD_S_WTR = 13.637+2.5 = 16.137ns
+
+ tRTW = "2.497ns"
+ tWTR_L = "23.637ns"
+ tWTR = "16.137ns"
+
+ # tRTP : max(12nCK, 7.5ns)
+ tRTP = "7.5ns"
+
+ # <=85C, half for >85C
+ tREFI = "3.9us"
+
+ # active powerdown and precharge powerdown exit time max(7.5ns, 8nCK)
+ tXP = "7.5ns"
+
+ # self refresh exit time
+ # According to the datasheet tXS = tRFC = 295ns (normal Refresh mode)
+ tXS = "295ns"
+
+ page_policy = "close_adaptive"
+
+ # Power related parameters
+ # Reference: https://media-www.micron.com/-/media/client/global/
+ # documents/products/data-sheet/dram/ddr5/16gb_ddr5_sdram_diereva.pdf
+ # Using the values for DDR5-4800
+ # DDR5 has one voltage domain, so all the
+ # CurrentVariable2 params should not be used or set to 0
+ IDD0 = "122mA"
+ # Using the value of IDD2P
+ IDD2P0 = "88mA"
+ IDD2N = "92mA"
+ # Using the value of IDD3P
+ IDD3P0 = "140mA"
+ IDD3N = "142mA"
+ IDD4W = "479mA"
+ IDD4R = "530mA"
+ # IDD5B - 277, IDD5C -- 135mA, IDD5F -- 262mA in the datasheet
+ IDD5 = "277mA"
+ # IDD6N
+ IDD6 = "102mA"
+
+ VDD = "1.1V"
+
+
+# Maximum bandwidth of DDR5_6400_4x8 (6400 MT/s) can be 25.6GB/s
+class DDR5_6400_4x8(DDR5_4400_4x8):
+ # For 6400 MT/s
+ tCK = "0.312ns"
+
+ # 16 beats across an x32 interface translates to 8 clocks @ 3200 MHz
+ tBURST = "2.496ns"
+
+ tRCD = "14.375ns"
+ tCL = "14.375ns"
+ # tCWL = tCL - 2(nCK)
+ tCWL = "13.751ns"
+ tRP = "14.375ns"
+
+ # RRD_S (different bank group) : 8nCK
+ tRRD = "2.496ns"
+
+ # RRD_L (same bank group) is MAX(8nCK, 5ns) for 1KB page
+ tRRD_L = "5ns"
+
+ # tFAW for 1KB page is MAX(32 CK, 10.00ns)
+ tXAW = "10ns"
+
+ # Rd/Wr turnaround timings
+ ###################################################################
+ # Note: gem5 adds tBURST separately while calculting rd--rd/wr or
+ # wr--wr/rd delays so we can ignore tBURST factor from the following
+ # equations while calculating the final value of the timing parameter
+ ####################################################################
+ # From the datasheet
+ # (1) tCCD_L_RTW =
+ # CL - CWL + RBL/2 + 2 tCK - (Read DQS offset) + (tRPST - 0.5 tCK) +
tWPRE
+ # where CWL = CL-2, RBL/2 = tBURST, Read DQS offset = 1ck, tRPST =
1.5tCK
+ # Therefore, tCCD_L_RTW =
+ # (14.375 - 13.751) + (2*0.312) - 0.312 + ((1.5*0.312)-(0.5*0.312)
+ # + (1.5*0.312) = 1.716ns
+
+ # (2) tCCD_S_RTW =
+ # CL - CWL + RBL/2 + 2 tCK - (Read DQS offset) + (tRPST - 0.5 tCK) +
tWPRE
+ # Therefore, tCCD_S_RTW = tCCD_L_RTW = 1.716ns
+
+ # (3) tCCD_L_WTR =
+ # CWL + WBL/2 + max(16nCK,10ns)
+ # where WBL/2 = tBURST
+ # Therefore,
+ # tCCD_L_WTR = 13.751+10 = 23.751ns
+
+ # (4) tCCD_S_WTR =
+ # CWL + WBL/2 + max(4nCK,2.5ns)
+ # where WBL/2 = tBURST
+ # Therefore,
+ # tCCD_S_WTR = 13.751+2.5 = 16.251ns
+
+ tRTW = "1.716ns"
+ tWTR_L = "23.751ns"
+ tWTR = "16.251ns"
+
+
+# Maximum bandwidth of DDR5_8400_4x8 (8400 MT/s) can be 33.6GB/s
+# Most of the timing parameters for DDR5_8400_4x8 are TBD in
+# the datasheet referred above.
+# The TBD parameters are extrapolated from the speed bins mentioned above.
+class DDR5_8400_4x8(DDR5_4400_4x8):
+ # For 8400 MT/s
+ tCK = "0.238ns"
+
+ # 16 beats across an x32 interface translates to 8 clocks @ 4200 MHz
+ tBURST = "1.904ns"
+
+ tRCD = "14.285ns"
+ tCL = "14.285ns"
+ tCWL = "13.809ns"
+ tRP = "14.285ns"
+
+ # RRD_S (different bank group) : 8nCK
+ tRRD = "1.904ns"
+
+ # tFAW for 1KB page is MAX(32 CK, 10.00ns)
+ tXAW = "10ns"
+
+ # Rd/Wr turnaround timings
+ ###################################################################
+ # Note: gem5 adds tBURST separately while calculting rd--rd/wr or
+ # wr--wr/rd delays so we can ignore tBURST factor from the following
+ # equations while calculating the final value of the timing parameter
+ ####################################################################
+ # From the datasheet
+ # (1) tCCD_L_RTW =
+ # CL - CWL + RBL/2 + 2 tCK - (Read DQS offset) + (tRPST - 0.5 tCK) +
tWPRE
+ # where CWL = CL-2, RBL/2 = tBURST, Read DQS offset = 1ck, tRPST =
1.5tCK
+ # Therefore, tCCD_L_RTW =
+ # (14.285 - 13.809) + (2*0.238) - 0.238 + ((1.5*0.238)-(0.5*0.238)
+ # + (1.5*0.238) = 1.309ns
+
+ # (2) tCCD_S_RTW =
+ # CL - CWL + RBL/2 + 2 tCK - (Read DQS offset) + (tRPST - 0.5 tCK) +
tWPRE
+ # Therefore, tCCD_S_RTW = tCCD_L_RTW = 1.309ns
+
+ # (3) tCCD_L_WTR =
+ # CWL + WBL/2 + max(16nCK,10ns)
+ # where WBL/2 = tBURST
+ # Therefore,
+ # tCCD_L_WTR =13.809+10 = 23.809ns
+
+ # (4) tCCD_S_WTR =
+ # CWL + WBL/2 + max(4nCK,2.5ns)
+ # where WBL/2 = tBURST
+ # Therefore,
+ # tCCD_S_WTR = 13.809+2.5 = 16.309ns
+
+ tRTW = "1.309ns"
+ tWTR_L = "23.809ns"
+ tWTR = "16.309ns"
+
+
# A single LPDDR5 x16 interface (one command/address bus)
# for a single x16 channel with default timings based on
# initial JEDEC specification
@@ -1263,7 +1525,6 @@
# Configuring for 16-bank mode with bank-group architecture
# burst of 32, which means bursts can be interleaved
class LPDDR5_5500_1x16_BG_BL32(DRAMInterface):
-
# Increase buffer size to account for more bank resources
read_buffer_size = 64
@@ -1390,7 +1651,6 @@
# Starting with 5.5Gbps data rates and 8Gbit die
# Configuring for 16-bank mode with bank-group architecture, burst of 16
class LPDDR5_5500_1x16_BG_BL16(LPDDR5_5500_1x16_BG_BL32):
-
# LPDDR5 is a BL16 or BL32 device
# With BG mode, BL16 and BL32 are supported
# Use BL16 for smaller access granularity
@@ -1412,7 +1672,6 @@
# Starting with 5.5Gbps data rates and 8Gbit die
# Configuring for 8-bank mode, burst of 32
class LPDDR5_5500_1x16_8B_BL32(LPDDR5_5500_1x16_BG_BL32):
-
# 4KiB page with 8B mode
device_rowbuffer_size = "4KiB"
@@ -1452,7 +1711,6 @@
# Configuring for 16-bank mode with bank-group architecture
# burst of 32, which means bursts can be interleaved
class LPDDR5_6400_1x16_BG_BL32(LPDDR5_5500_1x16_BG_BL32):
-
# 5.5Gb/s DDR with 4:1 WCK:CK ratio for 687.5 MHz CK
tCK = "1.25ns"
@@ -1497,7 +1755,6 @@
# 6.4Gbps data rates and 8Gbit die
# Configuring for 16-bank mode with bank-group architecture, burst of 16
class LPDDR5_6400_1x16_BG_BL16(LPDDR5_6400_1x16_BG_BL32):
-
# LPDDR5 is a BL16 or BL32 device
# With BG mode, BL16 and BL32 are supported
# Use BL16 for smaller access granularity
@@ -1519,7 +1776,6 @@
# 6.4Gbps data rates and 8Gbit die
# Configuring for 8-bank mode, burst of 32
class LPDDR5_6400_1x16_8B_BL32(LPDDR5_6400_1x16_BG_BL32):
-
# 4KiB page with 8B mode
device_rowbuffer_size = "4KiB"
diff --git a/src/python/SConscript b/src/python/SConscript
index 3b00b34..e261bfa 100644
--- a/src/python/SConscript
+++ b/src/python/SConscript
@@ -186,6 +186,8 @@
PySource('gem5.components.memory.dram_interfaces',
'gem5/components/memory/dram_interfaces/ddr4.py')
PySource('gem5.components.memory.dram_interfaces',
+ 'gem5/components/memory/dram_interfaces/ddr5.py')
+PySource('gem5.components.memory.dram_interfaces',
'gem5/components/memory/dram_interfaces/gddr.py')
PySource('gem5.components.memory.dram_interfaces',
'gem5/components/memory/dram_interfaces/hbm.py')
diff --git a/src/python/gem5/components/memory/__init__.py
b/src/python/gem5/components/memory/__init__.py
index 8a7b5ef..546d5d9 100644
--- a/src/python/gem5/components/memory/__init__.py
+++ b/src/python/gem5/components/memory/__init__.py
@@ -29,6 +29,9 @@
from .single_channel import SingleChannelDDR4_2400
from .single_channel import SingleChannelHBM
from .single_channel import SingleChannelLPDDR3_1600
+from .single_channel import DIMM_DDR5_4400
+from .single_channel import DIMM_DDR5_6400
+from .single_channel import DIMM_DDR5_8400
from .multi_channel import DualChannelDDR3_1600
from .multi_channel import DualChannelDDR3_2133
from .multi_channel import DualChannelDDR4_2400
diff --git a/src/python/gem5/components/memory/dram_interfaces/ddr5.py
b/src/python/gem5/components/memory/dram_interfaces/ddr5.py
new file mode 100644
index 0000000..1ffd7f8
--- /dev/null
+++ b/src/python/gem5/components/memory/dram_interfaces/ddr5.py
@@ -0,0 +1,292 @@
+# Copyright (c) 2023 The Regents of the University of California
+# All Rights Reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met: redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer;
+# redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution;
+# neither the name of the copyright holders nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Interfaces for DDR5 memories
+"""
+
+from m5.objects import DRAMInterface
+
+
+# A single DDR5-4400 32bit channel (4x8 configuration)
+# A DDR5 DIMM is made up of two (32 bit) channels.
+# Following configuration is modeling only a single 32bit channel.
+# Timings are based on Micron data sheet:
+# https://media-www.micron.com/-/media/client/global/
+# documents/products/data-sheet/dram/ddr5/ddr5_sdram_core.pdf
+# Configuration: 4Gbx8 devices (32Gb addressing)
+# Maximum bandwidth of DDR5_4400_4x8 (4400 MT/s) can be 17.6GB/s
+class DDR5_4400_4x8(DRAMInterface):
+ # size of a single device
+ device_size = "512MiB"
+
+ # single channel of 32bit width
+ # requires 8-bit wide 4 devices
+ device_bus_width = 8
+
+ # DDR5 is a BL16 device
+ burst_length = 16
+
+ # Each device has a page (row buffer) size of 256B
+ # Four devices lead to a page size of 1KB
+ device_rowbuffer_size = "256B"
+
+ # 4Gbx8 configuration
+ devices_per_rank = 4
+
+ ranks_per_channel = 1
+
+ # 4Gbx8 configuration of DDR5 has 8 bank groups,
+ # 4 banks per bank group and 32 banks in total
+ bank_groups_per_rank = 8
+ banks_per_rank = 32
+
+ write_buffer_size = 64
+ read_buffer_size = 64
+
+ # For 4400 MT/s
+ tCK = "0.454ns"
+
+ # 16 beats across an x32 interface translates to 8 clocks @ 2200 MHz
+ tBURST = "3.632ns"
+
+ # For 4400 MT/s, the number is max(8nCK, 5ns)
+ tCCD_L = "5ns"
+
+ # page 389 of the data sheet
+ tRCD = "14.545ns"
+ tCL = "14.545ns"
+ # tCWL = tCL - 2(nCK)
+ tCWL = "13.637ns"
+ tRP = "14.545ns"
+ tRAS = "32ns"
+
+ # RRD_S (different bank group) : 8nCK
+ tRRD = "3.632ns"
+
+ # RRD_L (same bank group) is MAX(8nCK, 5ns) for 1KB page
+ tRRD_L = "5ns"
+
+ # tFAW for 1KB page is MAX(32nCK, 14.545ns)
+ tXAW = "14.545ns"
+ activation_limit = 4
+
+ # Note: could not find the rank to rank delay
+ # from the datasheet, but, since we are modeling
+ # a single rank device, it should not matter.
+ # Using the DDR4 number as default (i.e. ~2tCK)
+ tCS = "1ns"
+
+ # tRFC (Normal) for 16Gb device is 295ns
+ tRFC = "295ns"
+
+ tPPD = "0.908ns" # 2nCK
+ tWR = "30ns"
+
+ # Rd/Wr turnaround timings
+ ###################################################################
+ # Note: gem5 adds tBURST separately while calculting rd--rd/wr or
+ # wr--wr/rd delays so we can ignore tBURST factor from the following
+ # equations while calculating the final value of the timing parameter
+ ####################################################################
+ # From the datasheet
+ # (1) tCCD_L_RTW =
+ # CL - CWL + RBL/2 + 2 tCK - (Read DQS offset) + (tRPST - 0.5 tCK) +
tWPRE
+ # where CWL = CL-2, RBL/2 = tBURST, Read DQS offset = 1ck, tRPST =
1.5tCK
+ # Therefore, tCCD_L_RTW =
+ # (14.545 - 13.637) + (2*0.454) - 0.454 +
+ # ((1.5*0.454)-(0.5*0.454) + (1.5*0.454) = 2.497ns
+
+ # (2) tCCD_S_RTW =
+ # CL - CWL + RBL/2 + 2 tCK - (Read DQS offset) + (tRPST - 0.5 tCK) +
tWPRE
+ # Therefore, tCCD_S_RTW = tCCD_L_RTW = 2.497ns
+
+ # (3) tCCD_L_WTR =
+ # CWL + WBL/2 + max(16nCK,10ns)
+ # where WBL/2 = tBURST
+ # Therefore,
+ # tCCD_L_WTR = 13.637+10 = 23.637ns
+
+ # (4) tCCD_S_WTR =
+ # CWL + WBL/2 + max(4nCK,2.5ns)
+ # where WBL/2 = tBURST
+ # Therefore,
+ # tCCD_S_WTR = 13.637+2.5 = 16.137ns
+
+ tRTW = "2.497ns"
+ tWTR_L = "23.637ns"
+ tWTR = "16.137ns"
+
+ # tRTP : max(12nCK, 7.5ns)
+ tRTP = "7.5ns"
+
+ # <=85C, half for >85C
+ tREFI = "3.9us"
+
+ # active powerdown and precharge powerdown exit time max(7.5ns, 8nCK)
+ tXP = "7.5ns"
+
+ # self refresh exit time
+ # According to the datasheet tXS = tRFC = 295ns (normal Refresh mode)
+ tXS = "295ns"
+
+ page_policy = "close_adaptive"
+
+ # Power related parameters
+ # Reference: https://media-www.micron.com/-/media/client/global/
+ # documents/products/data-sheet/dram/ddr5/16gb_ddr5_sdram_diereva.pdf
+ # Using the values for DDR5-4800
+ # DDR5 has one voltage domain, so all the
+ # CurrentVariable2 params should not be used or set to 0
+ IDD0 = "122mA"
+ # Using the value of IDD2P
+ IDD2P0 = "88mA"
+ IDD2N = "92mA"
+ # Using the value of IDD3P
+ IDD3P0 = "140mA"
+ IDD3N = "142mA"
+ IDD4W = "479mA"
+ IDD4R = "530mA"
+ # IDD5B - 277, IDD5C -- 135mA, IDD5F -- 262mA in the datasheet
+ IDD5 = "277mA"
+ # IDD6N
+ IDD6 = "102mA"
+
+ VDD = "1.1V"
+
+
+# Maximum bandwidth of DDR5_6400_4x8 (6400 MT/s) can be 25.6GB/s
+class DDR5_6400_4x8(DDR5_4400_4x8):
+ # For 6400 MT/s
+ tCK = "0.312ns"
+
+ # 16 beats across an x32 interface translates to 8 clocks @ 3200 MHz
+ tBURST = "2.496ns"
+
+ tRCD = "14.375ns"
+ tCL = "14.375ns"
+ # tCWL = tCL - 2(nCK)
+ tCWL = "13.751ns"
+ tRP = "14.375ns"
+
+ # RRD_S (different bank group) : 8nCK
+ tRRD = "2.496ns"
+
+ # RRD_L (same bank group) is MAX(8nCK, 5ns) for 1KB page
+ tRRD_L = "5ns"
+
+ # tFAW for 1KB page is MAX(32 CK, 10.00ns)
+ tXAW = "10ns"
+
+ # Rd/Wr turnaround timings
+ ###################################################################
+ # Note: gem5 adds tBURST separately while calculting rd--rd/wr or
+ # wr--wr/rd delays so we can ignore tBURST factor from the following
+ # equations while calculating the final value of the timing parameter
+ ####################################################################
+ # From the datasheet
+ # (1) tCCD_L_RTW =
+ # CL - CWL + RBL/2 + 2 tCK - (Read DQS offset) + (tRPST - 0.5 tCK) +
tWPRE
+ # where CWL = CL-2, RBL/2 = tBURST, Read DQS offset = 1ck, tRPST =
1.5tCK
+ # Therefore, tCCD_L_RTW =
+ # (14.375 - 13.751) + (2*0.312) - 0.312 + ((1.5*0.312)-(0.5*0.312)
+ # + (1.5*0.312) = 1.716ns
+
+ # (2) tCCD_S_RTW =
+ # CL - CWL + RBL/2 + 2 tCK - (Read DQS offset) + (tRPST - 0.5 tCK) +
tWPRE
+ # Therefore, tCCD_S_RTW = tCCD_L_RTW = 1.716ns
+
+ # (3) tCCD_L_WTR =
+ # CWL + WBL/2 + max(16nCK,10ns)
+ # where WBL/2 = tBURST
+ # Therefore,
+ # tCCD_L_WTR = 13.751+10 = 23.751ns
+
+ # (4) tCCD_S_WTR =
+ # CWL + WBL/2 + max(4nCK,2.5ns)
+ # where WBL/2 = tBURST
+ # Therefore,
+ # tCCD_S_WTR = 13.751+2.5 = 16.251ns
+
+ tRTW = "1.716ns"
+ tWTR_L = "23.751ns"
+ tWTR = "16.251ns"
+
+
+# Maximum bandwidth of DDR5_8400_4x8 (8400 MT/s) can be 33.6GB/s
+# Most of the timing parameters for DDR5_8400_4x8 are TBD in
+# the datasheet referred above.
+# The TBD parameters are extrapolated from the speed bins mentioned above.
+class DDR5_8400_4x8(DDR5_4400_4x8):
+ # For 8400 MT/s
+ tCK = "0.238ns"
+
+ # 16 beats across an x32 interface translates to 8 clocks @ 4200 MHz
+ tBURST = "1.904ns"
+
+ tRCD = "14.285ns"
+ tCL = "14.285ns"
+ tCWL = "13.809ns"
+ tRP = "14.285ns"
+
+ # RRD_S (different bank group) : 8nCK
+ tRRD = "1.904ns"
+
+ # tFAW for 1KB page is MAX(32 CK, 10.00ns)
+ tXAW = "10ns"
+
+ # Rd/Wr turnaround timings
+ ###################################################################
+ # Note: gem5 adds tBURST separately while calculting rd--rd/wr or
+ # wr--wr/rd delays so we can ignore tBURST factor from the following
+ # equations while calculating the final value of the timing parameter
+ ####################################################################
+ # From the datasheet
+ # (1) tCCD_L_RTW =
+ # CL - CWL + RBL/2 + 2 tCK - (Read DQS offset) + (tRPST - 0.5 tCK) +
tWPRE
+ # where CWL = CL-2, RBL/2 = tBURST, Read DQS offset = 1ck, tRPST =
1.5tCK
+ # Therefore, tCCD_L_RTW =
+ # (14.285 - 13.809) + (2*0.238) - 0.238 + ((1.5*0.238)-(0.5*0.238)
+ # + (1.5*0.238) = 1.309ns
+
+ # (2) tCCD_S_RTW =
+ # CL - CWL + RBL/2 + 2 tCK - (Read DQS offset) + (tRPST - 0.5 tCK) +
tWPRE
+ # Therefore, tCCD_S_RTW = tCCD_L_RTW = 1.309ns
+
+ # (3) tCCD_L_WTR =
+ # CWL + WBL/2 + max(16nCK,10ns)
+ # where WBL/2 = tBURST
+ # Therefore,
+ # tCCD_L_WTR =13.809+10 = 23.809ns
+
+ # (4) tCCD_S_WTR =
+ # CWL + WBL/2 + max(4nCK,2.5ns)
+ # where WBL/2 = tBURST
+ # Therefore,
+ # tCCD_S_WTR = 13.809+2.5 = 16.309ns
+
+ tRTW = "1.309ns"
+ tWTR_L = "23.809ns"
+ tWTR = "16.309ns"
diff --git a/src/python/gem5/components/memory/single_channel.py
b/src/python/gem5/components/memory/single_channel.py
index 43aab45..9235bbd 100644
--- a/src/python/gem5/components/memory/single_channel.py
+++ b/src/python/gem5/components/memory/single_channel.py
@@ -29,6 +29,7 @@
from typing import Optional
+from .dram_interfaces.ddr5 import DDR5_4400_4x8, DDR5_6400_4x8,
DDR5_8400_4x8
from .dram_interfaces.ddr4 import DDR4_2400_8x8
from .dram_interfaces.hbm import HBM_1000_4H_1x128
from .dram_interfaces.lpddr3 import LPDDR3_1600_1x32
@@ -74,3 +75,30 @@
if not size:
size = "256MiB"
return ChanneledMemory(HBM_1000_4H_1x128, 1, 64, size=size)
+
+
+def DIMM_DDR5_4400(
+ size: Optional[str] = None,
+) -> AbstractMemorySystem:
+ """
+ A single DIMM of DDR5 has two channels
+ """
+ return ChanneledMemory(DDR5_4400_4x8, 2, 64, size=size)
+
+
+def DIMM_DDR5_6400(
+ size: Optional[str] = None,
+) -> AbstractMemorySystem:
+ """
+ A single DIMM of DDR5 has two channels
+ """
+ return ChanneledMemory(DDR5_6400_4x8, 2, 64, size=size)
+
+
+def DIMM_DDR5_8400(
+ size: Optional[str] = None,
+) -> AbstractMemorySystem:
+ """
+ A single DIMM of DDR5 has two channels
+ """
+ return ChanneledMemory(DDR5_8400_4x8, 2, 64, size=size)
--
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Gerrit-Owner: Ayaz Akram <yazak...@ucdavis.edu>
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