DDR4 test-2

Use vivado ddr ip To achieve large capacity ram, You can find this ip Unfriendly , There are few models of self-contained devices ,

Generally, the model you need to test , Need to download one csv File template filling parameters , Customize a model .

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And this csv Documents must be found soddim Strip device component The manual of particles can complete the parameter filling ,

Look directly at soddim Our manual is incomplete . Generally, there is a summary list of time parameters at the end of the manual .

If you don't need to run very often , Choose a pin with similar parameters (rank/ Particle width /soddim Overall bit width ) The device , Set the frequency to 1500ps( As low as possible ) Basically, it can also be used directly .

ip The phenomenon of downloading to the board is generally as follows ：

(1) , If ip Of rst The signal is pulled to download , Then even if the reset will be released later ,ddr ip The status of is also abnormal （invalid core）, I'm a little strange about this .

(2), If ip clk If the clock is lost due to wrong pin allocation or other reasons , Then you can't scan this mig Of .

Through the above two points, we can preliminarily judge whether there is a problem with the clock and reset .

If it still shows ：

You can see that the first test has not been done , This is actually the wrong configuration of other pins .

You can see that the following items have passed the test , Then there may be the timing problem ,

It is necessary to carefully adjust parameters or conduct frequency reduction test according to the manual .

x2/x4/x8/x16 The difference of ：

Necessary knowledge of selecting memory modules ：x16 Why is the memory module so slow ？2R and 1R Is it important? ？ - You know