Initial Release – July 2015 – Max10 DDR3 SDRAM UniPHY 300MHz Half Rate, Quartus II v15.0, DDR3 SDRAM Controller with UniPHY.
This design is meant as a demo style lab. It very briefly covers the steps required to design a 24-bit wide, 300-MHz DDR3 SDRAM interface working with a Max10 FPGA development kit using a 24-bit wide DDR3 SDRAM interface comprises an IS43TR16640A-125JBLI and an IS43TR81280A-125JBLI DDR3 SDRAM components. The purpose of the lab is for the reader to get a basic feel for what steps are involved in getting an external memory working with an Altera FPGA and the UniPHY IP. The lab will not cover any of the steps in detail but simply show an overview of the design process.
The UniPHY IP also generates an example top level file, an example driver, and a test bench including an external memory model. All these will be used to demonstrate the DDR3 SDRAM functionality.
The table below lists the specifications for this design:
|Quartus version||QuartusII v15.0|
|Memory device||DDR3 SDRAM (ISSI IS43TR16640A-125JBLI and ISSI IS43TR81280A -125JBLI)|
|Memory topology||X24-bit, 2 DDR3 SDRAM components|
|IP used||DDR3 SDRAM Controller II with UniPHY IP and generated example top Quartus project|
The lab uses Quartus II v15.0 and has Modelsim set up for simulation. The lab assumes the reader is a competent user of these tools and many of their features.
A Quartus archive for the final project is also included for reference. Files for this lab are located in this zip file – Max10_Uniphy_ddr3.zip. Create a new folder for the project and place the files in it.
1. In the Quartus II software, create a Quartus II project using the New Project Wizard available from the File menu. For this lab, use following information to setup the project accordingly:
2. Launch the IP Catalog from the Tools menu
3. Double click DDR3 SDRAM Controller with UniPHY IP from the Memory Interfaces and Controllers > Memory Interfaces with UniPHY folder in the Library list.
4. Set parameters for Memory Controller with UniHY
1. Set Speed grade to 6.
2. Set Memory clock frequency to 300 MHz
3. Set PLL reference clock frequency to 100 MHz.
4. Select Half for half-rate Avalon-MM interface.
1. Select Discrete Device for Memory format.
2. Select 800 MHz for Memory device speed grade.
3. Type 24 for Total interface width.
4. Type 13 for Row address width.
5. Type 10 for Column address width.
6. Type 3 for Bank address width.
7. Select 5 for Memory CAS latency setting under Memory Initialization Options,
8. Select RZQ/4 for Output drive strength setting.
9. Select 5 for Memory write CAS latency setting.
10. Select Dynamic ODT off for Dynamic ODT(Rtt_WR) setting.
1. Set tIS (base) to 170ps
2. Set tIH (base) to 120ps
3. Set tDS(base) to 10ps
4. Set tDH(base) to 45ps
5. Set tDQSQ to 100ps
6. Set tDQSS to 0.27 cycles
7. Set tDSH to 0.18 cycles
8. Set tDSS to 0.18 cycles
9. Set tINIT to 500us
10. Set tMRD to 4cycles
11. Set tRAS to 35.0ns
12. Set tRCD to 13.75ns
13. Set tRP to 13.75ns
14. Set tREFI to 7.8us
15. Set tRFC to 110ns
16. Set tWTR to 6 cycles
17. Set tFAW to 30.0ns
1. Users should do board simulation for proper values in this page:
- In the Board Settings tab, set the slew rate parameters to the specified values below:
Select Use Altera’s default settings
CK/CK# slew rate (Differential): 2.0V/ps
Address and command slew rate: 1.0V/ns
DQS/DQS# slew rate (Differential): 2.0V/ns
DQ slew rate: 1.0V/ns
- Set the Intersymbol Interference/Crosstalk parameters to the specified value below:
Select Use Altera’s default settings
Address and command eye reduction (setup) = 0.0ns
Address and command eye reduction (hold) = 0.0ns
Write DQ eye reduction = 0.0ns
Write Delta DQS arrival time = 0.0ns
Read DQ eye reduction = 0.0ns
Read Delta DQS arrival time = 0.0ns
- Set the Board Skews parameters to the below value:
Maximum CK delay to DIMM/device : 0.2443ns
Maximum CK delay to DIMM/device : 0.21929ns
Minimum delay difference between CK and DQS : 0.02286ns
Maximum delay difference between CK and DQS : 0.04429ns
Minimum skew within DQS group : 0.01806ns
Minimum skew between DQS group : 0.04246ns
Average delay difference between DQ and DQS : -0.01152ns
Maximum skew within address and command bus: 0.07801ns
Average delay difference between address and command and CK: -0.04909ns
- Set 64 for Maximum Avalon-MM burst length under Avalon Interface
5. Click on the Finish button and the pop-up window appear. Check the box for Generate Example Design and click on Generate.
6. Once the generation completed, click Exit.
1. Set Top-Level Entity
The Megawizard generates a Quartus example top project. This project connects an example driver to the controller interface so users can quickly compile and test their UniPHY IP configuration on hardware.
2. Perform Analysis and Synthesis
This step is required so Quartus can determine the names of the external ports connected to the UniPHY for when the I/O assignments are created in the next step.
3. Assign the pin and DQ group settings
Run the tcl script <variation_name>_pin_assignments.tcl to assign the pin and DQ group assignments. This tcl script is generated for you by the IP megawizard
4. Assign the pin locations
Pin locations for external memory systems are not automatically created.
5. Do a Full Compile
1. In the Quartus II software, launch SignalTap II Logic Analyzer from Tools menu.
1. Timing Analysis results
'In the Compilation Report, Time Quest Timing Analyzer folder expand the three VT model folders, and the Report DDR folder
Note: there will be some unconstrained paths in the design. These are associated with the example driver that will not be part of a fully integrated HP controller design.
1. On board debug with Signal Tap
Open the Signal Tap file and reset the .sof file to the one just created with the full compilation
- Reset the design by pushing the press button for CPU reset on the development kit
- Ensure that test complete goes high (signal tap is trigger on this), this is the end of the driver testing, check the driver's pass signal is high.
- Also check that calibration was successful and that the PLL is locked
- Also the LED1 on the board will light up and turn to green colour
The Quartus II software creates a complete design example for functional simulation in the <variation_name>_example_design/simulation/ directory. To run the RTL simulation, perform the following steps:
Initial Release – July 2015 – Max10 DDR3 SDRAM x24 300MHz, Quartus II v15.0, DDR3 SDRAM Controller with UniPHY, Max10 Development Kit.
UniPHY, DDR3 SDRAM, Design Example, External Memory , Max 10