can't understand this bit of a RM

[Pencioner]

I can't understand a bit of a LPSPI FRAMESZ description from the RT1060 Reference Manual rev. 3 (see screenshot)

So, previously it says that LPSPI word size is 32bit and i don't see any configuration for it, so how then it says that minimum word size is 2 bit.
Statement that frame size of 33 bits is not supported - is it just this value, 33 bit, somehow special, or any other (n * wordsize) + 1 is too (f.e. 65 or 97 frame size?)

Thanks in advance!

[Pencioner]

P.S. found a way to inline an image, this is the same as i have attached

[Gavin_Jia · Accepted solution]

Hi @Pencioner ,

Thanks for your interest in NXP MIMXRT series!

1. The minimum word length here means that the remainder of the frame length divided by 32 cannot be 1. This is a hardware reason and does not need to be configured manually. 

2. Therefore, it also means that 33bit is not supported, similarly, the 65,97bit you mentioned is also not supported.

Hope it helps!

Best regards,
Gavin

[Pencioner]

Hi, yes now this makes sense - so it is a minimum word size for the incomplete word which is last word in the frame. I believe if you have this statement in this and maybe other RMs it would be good to somehow express it in different words so it would be easier to get it

Thanks a lot!

[Littell]

Hahaha, what a joke! Welcome to the wonderful world of modern "documentation", your choices are either "missing/incomplete" or "so horribly written as to be virtually impenetrable".

Dear God how I miss Motorola-era documentation. It's been all downhill since then.