2 Questions about FlexRAM

[kmh48301]

Hi. I'm using S32k144.

But the forum dosen't work for me. so I'm posting here.

1. FlexRAM is slower than SRAM

Please see the attachment. (it's from AN11983 p11)

When I see flash memory map, I think FlexRAM is also contiguous addresses.

but this is saying non-contiguous...

and is that why the FlexRAM is slower than SRAM?

FlexRAM is not static RAM (SRAM)?

2. "a background pattern of all ones" ???

I saw "a background pattern of all ones" several times in NXP documents..

But I have no idea what it means since I'm not native English speaker,,

Please explain to me

Thanks

Best regards,

Phillip

[kmh48301]

Thank you so much. i thought wrong way. hahaha

[kmh48301]

1.

2.

[lukaszadrapa · Accepted solution]

Hi,

1. This is given by architecture, not by the RAM itself. As you can see, the memories are sitting on different places which inserts some difference:

2. "background pattern of all ones"  means, that memory controller will initialize all bytes in FlexRAM allocated for EEE to "0xFF" (all ones) and then it will copy down valid data/records from backup flash. So, non-written words have default value 0xFFFFFFFF.

Regards,

Lukas