With all of that we are now fully setup to use the core! The user interface If you don't hold your circuit in reset when this input isn't high, you risk running into glitches as the clocks may be doing weird things. The locked output goes high when it isn't being reset and the clocks are stable. This works since the locked output of the clock wizard goes low when it is reset. The reset button on the board will still work as the reset since it is used to reset the clock wizard which then resets the memory controller. Because of this, we can remove the reset_conditioner module from our top level module. This is because our DDR3 interface is setup to run at 325MHz with a 4:1 ratio.Īlso notice that we are using the mig.sync_rst signal as our reset. This clock is the one that the user interface is synchronized to. To clock the rest of our design, we will be using the signal mig.ui_clk which is another synthesized clock from the memory interface. In this case, we don't really care about this. The same is not true for the input clock and the output clocks. The two outputs of the clock wizard are also phase aligned (rising edges match up) which may or may not be important for your design. You can often run into issues if you try to route the clock to special resources like the PLL used by the clock wizard and the general fabric. The clk only needs to route to the clk_wiz_0 core and nowhere else. This is to keep the routing in the FPGA simple. Note that we are using the 100MHz output from the clk_wiz module instead of the clk signal directly. Rst = mig.sync_rst // use the reset signal from the mig core Mig.sys_rst = !clk_wiz.locked // reset when clk_wiz isn't locked Mig.clk_ref = clk_wiz.clk_out2 // 200MHz clock Mig.sys_clk = clk_wiz.clk_out1 // 100MHz clock Rst = reset_cond.out // conditioned reset Reset_cond.in = ~rst_n // input raw inverted reset signal DDR3 Interface - connect inouts directly This ensures the entire FPGA comes out of reset at the same time. The reset conditioner is used to synchronize the reset signal to the FPGA Input rst_n, // reset button (active low) Mem_out.rd_valid = mig.app_rd_data_valid Single-ended iodelayctrl clk (reference clock) Once you click this, Alchitry Labs will add a Vivado IP Project to your project and invoke the necessary commands to add the memory interface.
Note that this option is only visible if your project is for the Alchitry Au board. To invoke the commands needed to add the Xilinx memory interface to your project with everything already setup, go to Project->Add Memory Controller. While you can find all the information you need to set this up for the Alchitry Au, we have drastically simplified it for you in Alchitry Labs.
MEMORY MASTER RAM DDR3 FULL
To efficiently use this, Xilinx provides customizable IP via their IP catalog in Vivado.Ĭustomizing this IP requires full knowledge of the DDR3 chip being used and the board pinout. There is special hardware on the Artix 7 FPGA that is used for interfacing with the DDR chip. The Alchitry Cu and Mojo don't have DDR memory on board so this tutorial is only for the Alchitry Au.
MEMORY MASTER RAM DDR3 FREE
We called ours DDR Demo, but feel free to name yours whatever you want.Īlso make sure that the project is for the Alchitry Au. From here, make a new project based on the Base Project. Open Alchitry Labs, and go to Project->New Project. Setupīefore starting, you need to have Alchitry Labs 1.1.6 and Vivado 2019.1 or newer. Let’s get into the BIOS.In this tutorial we are going to setup an interface to the DDR3 memory with the FPGA on the Alchitry Au. If you haven’t enabled XMP, it will likely be slower than the speed your memory kit is rated for. Then in the main part of the window you’ll see Speed (pictured above) showing your RAM’s current running speed in megahertz. Next, click on the Performance tab and select Memory from the left rail.
MEMORY MASTER RAM DDR3 WINDOWS 10
Search for “Task Manager” in Windows 10 and then choose “Task Manager” from the results (or press good ol’ Ctrl + Alt + Delete to summon it instantly). Once Task Manager opens click the More details option at the bottom of the window to expand if necessary.
Check your current RAM speed IDGīefore we start, let’s see how fast your memory is running now. We can, however, provide a few basic guidelines to help you navigate your way through this process. The problem is that we can’t provide step-by-step instructions that will work for everyone, since every motherboard’s BIOS handles things a little differently.
Once there, enabling it is pretty simple. To get to the XMP settings, however, you have to dip into your PC’s BIOS.
0 kommentar(er)
