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i.MX 8X: Can a single QSPI chip select drive multiple Flash devices?

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i.MX 8X: Can a single QSPI chip select drive multiple Flash devices?

‎12-07-2020 04:22 PM
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EAlepins
Contributor V

Hi,

The i.MX 8X QSPI module only has 4 chip selects (slave selects). In order to increase the memory capacity available, is it possible to connect to a single QSPI slave select (SS) 2 quad SPI Flash devices, the i.MX 8X seeing the as a single octal Flash device? That way, 2 chip selects could be used for 4 Flash devices and the 2 other SS could be used for other purposes.

If not, why? The QSPI can't drive only 1 SS when it communicates over the 8 data pins?

Thanks.

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‎12-07-2020 06:09 PM
800 Views
igorpadykov
NXP Employee
NXP Employee

Hi EAlepins

 

> is it possible to connect to a single QSPI slave select (SS) 2 quad SPI Flash devices,
>the i.MX 8X seeing the as a single octal Flash device?

 

2 qspi can not be connected, sorry. Octal spi flash can be connected with single QSPI slave select (SS)

as described on Figure 18-4  i.MX 8DualXPlus/8QuadXPlus Applications Processor Reference Manual

 

>f not, why?

 

due to hardware design.

 

Best regards
igor

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