topic Re: about i.MX51 WEIM for Parallel NOR Flash Configration in i.MX Processors

about i.MX51 WEIM for Parallel NOR Flash Configration

george — Fri, 21 Jul 2017 13:24:17 GMT

Dear all,

Currently, my customer is manufacturing the product using i.MX51.

* The product OS is WinCE.

The product is connected to parallel NOR-Flash via WEIM.

The parallel NOR-Flash which they will use soon reaches EOL.

Therefore, they are going to change into NOR which supports only asynchronous access.

They did the test using the current NOR.

* The current NOR supports synchronous and asynchronous access.

They only disable SRD bit into CS0GCR1 register.

But the NOR-Flash value cannot be correctly read only by it.

It seems that their product has passed since development for many years, and the product designer is not.

They are set emi_clk_sel into CBCDR register and they say that can read correctly.

But I do not think it as the correct way.

How should I advise them?

I think that register setting for WEIM will be heard.

If there is a better way, please tell me.

Best Regards,

George

Re: about i.MX51 WEIM for Parallel NOR Flash Configration

igorpadykov — Fri, 21 Jul 2017 23:44:07 GMT

Hi George

one can check weim signals with oscilloscope using

sect.4.6.7.5 General WEIM Timing-Asynchronous Mode i.MX51 Datasheet
http://www.nxp.com/docs/en/data-sheet/IMX51CEC.pdf

for weim asynchronous access settings one can look at i.MX53 OBDS (..drivers/weimnor)
example, it has similar weim module
Lab and Test Software (2)
On-Board Diagnostic Suit for the i.MX53 Quick Start Board
http://www.nxp.com/products/automotive-products/energy-power-management/pmics/power-management-for-i.mx-application-processors/i.mx53-quick-start-board:IMX53QSB?tab=Design_Tools_Tab

Best regards
igor
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Re: about i.MX51 WEIM for Parallel NOR Flash Configration

george — Mon, 24 Jul 2017 01:38:14 GMT

Dear Igor,

I will tell them observing the waveform for WEIM so that you may say.

And I will post the response from them here again.

Thanks,

George