Nios2 generic_quad_spi_controller2 set dummy clycles

[Fabrizio2]

Hi all, on Nios2 - MAX10 device, with QUARTUS 18.1 :

I'm working on an old  project and I use the generic_quad_spi_controller2  to interface a flash memory MICRON MT25QU512ABB  .

The generic_quad_spi_controller2 driver works fine since many years in this active project.

We want to set the dummy cycles of the flash to a certain value in order to slow down the working clock frq from 60Mhz to 30 Mhz .

As per MICRON datasheet this is done by writing to the flash memory register "Non volatile configuration register" .

The NIOS2 generic_quad_spi_controller2   apparently doesn't provide any HAL function that can be used to set dummy cycles or access any Memory config registers.

Is there a way to do this?

[KennyTan_Altera]

Kindly note that there will be some slowness on the first reply due to the public holiday, we will get back to you as soon as possible.

[hareesh]

Hi,

I am checking the driver files. please give me some time to solve this issue.

[hareesh]

Hi,

you are doing it in the Non-Volatile register. if you do that in that register those changes are permanent. because of that, we are not recommended.

may I know why you are trying to configure the Non-Volatile register? any particular reason?

Thank you,

[Fabrizio2]

Hi Hareesh,

thank you for the help, actually what I would like to do is:

-See the flash refresh rate (should be something like 30Mhz)

-Slow down the refresh rate of the flash to 30Mhz by modifying the dummy cycles in the flash , this is done by writing the nonvolatile register of the flash,  but I don't know how to do it through the generic_quad_spi_controller2 driver controller2.

Let me know, please.

Thank you

Best regards

Fabrizio

[hareesh]

Hi,

if you configure the  Volatile Configuration Register or  Non-Volatile Configuration Register for the Number of dummy clock cycles, it generates some dummy clock cycles before command execution. it may cause some data loss. so we are not recommended to configure the Volatile Configuration Register or  Non-Volatile Configuration Registers.

To slow down the refresh rate please control the DCLOCK. for this follow the billow document.

https://media-www.micron.com/-/media/client/global/documents/products/data-sheet/nor-flash/serial-nor/mt25q/die-rev-b/mt25q_qlkt_u_512_abb_0.pdf?rev=b259aadc3bea49ea8210a41c9ad58211

Thank you,

[Fabrizio_]

Hi Hareesh,

So, this means that we cannot configure the dummy cycles of the flash using the controller2 driver, hence to configure the actual working clock frequency of the flash.

In order to use flash we need to know the clock frequency we can use to drive it, so we must know how :

-1 the dummy clock cycles setting .

-2 If the flash is set in QuadOut Fast Read  or Quad I/O fast read

This is because the controller2 doesn't provide any information regarding the above .

[hareesh]

Hi,

sorry for delaying. actually, I was not able to see your last post. now it's fine. just give me the time and I will give you information about your query.

[hareesh]

Hi,

yes, we are not recommended to configure the dummy cycles.

i am trying to get some more information related to your issue.

[hareesh]

Hi,

sorry for taking a long time. may I know the current status of your issue?

[hareesh]

any update?

[hareesh]

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