https://community.nxp.com/t5/i-MX-Processors/Problem-reading-writing-on-HyperRAM-connected-to-flexSPI/m-p/1177204#M164441 <P>Hello,</P><P>I am working on iMX8QXP based custom board with L5.4.24-2.1.0 and trying to interface an Octal RAM on its FlexSPI interface. The command set of the RAM I am using is similar to the Cypress S27KL/S27KS series HyperRAM and a PSRAM APS6408L-Ocx from apmemory. This has confused me whether I should use a spi-nor driver or hyperbus driver or make my own.</P><P>I have created a driver for Octal RAM "inspired" from spi-nor and fortunately, with few dummy cycles adjustment, I am able to read ID register and able to read-write to configuration register which are only 2 bytes long each.</P><P>My concern comes when I try to read-write data to/from memory. With dummy cycle adjustment I am able to read and write data to memory but I see many garbage bytes while reading.</P><P>I have learned that iMXRT1050 EVK has a hyperflash on board which is connected to the flexSPI interface. Also, I went through application note AN12239 <STRONG>How to enable HyperRAM with i.MX RT</STRONG><SPAN>. I also went through the iMX RT SDK demo but it did not help to solve the issue I am facing.</SPAN></P><P><SPAN>Is there any document on how to communicate to hyperRAM using flexSPIwith iMX8 processors?</SPAN></P><P><SPAN>Has anyone else faced a similar problem?</SPAN></P><P>&nbsp;</P><P><SPAN>Thank you</SPAN></P><P><SPAN>Priyank</SPAN></P> Tue, 03 Nov 2020 10:50:01 GMT priyank_bhatt 2020-11-03T10:50:01Z https://community.nxp.com/t5/i-MX-Processors/Problem-reading-writing-on-HyperRAM-connected-to-flexSPI/m-p/1177204#M164441 <P>Hello,</P><P>I am working on iMX8QXP based custom board with L5.4.24-2.1.0 and trying to interface an Octal RAM on its FlexSPI interface. The command set of the RAM I am using is similar to the Cypress S27KL/S27KS series HyperRAM and a PSRAM APS6408L-Ocx from apmemory. This has confused me whether I should use a spi-nor driver or hyperbus driver or make my own.</P><P>I have created a driver for Octal RAM "inspired" from spi-nor and fortunately, with few dummy cycles adjustment, I am able to read ID register and able to read-write to configuration register which are only 2 bytes long each.</P><P>My concern comes when I try to read-write data to/from memory. With dummy cycle adjustment I am able to read and write data to memory but I see many garbage bytes while reading.</P><P>I have learned that iMXRT1050 EVK has a hyperflash on board which is connected to the flexSPI interface. Also, I went through application note AN12239 <STRONG>How to enable HyperRAM with i.MX RT</STRONG><SPAN>. I also went through the iMX RT SDK demo but it did not help to solve the issue I am facing.</SPAN></P><P><SPAN>Is there any document on how to communicate to hyperRAM using flexSPIwith iMX8 processors?</SPAN></P><P><SPAN>Has anyone else faced a similar problem?</SPAN></P><P>&nbsp;</P><P><SPAN>Thank you</SPAN></P><P><SPAN>Priyank</SPAN></P> Tue, 03 Nov 2020 10:50:01 GMT https://community.nxp.com/t5/i-MX-Processors/Problem-reading-writing-on-HyperRAM-connected-to-flexSPI/m-p/1177204#M164441 priyank_bhatt 2020-11-03T10:50:01Z https://community.nxp.com/t5/i-MX-Processors/Problem-reading-writing-on-HyperRAM-connected-to-flexSPI/m-p/1177577#M164474 <P>Hi priyank_bhatt</P> <P>&nbsp;</P> <P>reason for read issues may be that for hyperRAM it is necessary to use specific for it</P> <P>LUT table. Some details can be found in Figure 18-11. HyperBus device read transaction</P> <P><A id="relatedDocsClick_1" href="https://www.nxp.com/webapp/Download?colCode=IMX8DQXPRM" target="_blank" rel="noopener"><STRONG>i.MX 8DualXPlus/8QuadXPlus Applications Processor Reference Manual</STRONG></A></P> <P>Application note AN12239 also can be useful as it describes similar FlexSPI module.</P> <P>&nbsp;</P> <P>Best regards<BR />igor</P> Wed, 04 Nov 2020 00:33:44 GMT https://community.nxp.com/t5/i-MX-Processors/Problem-reading-writing-on-HyperRAM-connected-to-flexSPI/m-p/1177577#M164474 igorpadykov 2020-11-04T00:33:44Z