Kinetis MicrocontrollersのトピックK64 Sub-Family Ref Manual -- type-O or EMAC Enhanaced Buff really change

K64 Sub-Family Ref Manual -- type-O or EMAC Enhanaced Buff really change

JHinkle — Thu, 11 Aug 2016 19:08:18 GMT

I'm working on a K64 EMET driver and compared the Enhanced Buffers between the K64 and the K60.

Did the locations for the "Data Length" and the first set of status registers flip-flop, or is just a publication error?

K60 ................................................ Notice Offset 0 is Status flags

K64 .......................................................... Notice Offset 0 is Data Length

I've been running the K64 with the K60 layout and it seems to work but in tracking down an issue ... I noticed the flip-flop --- Which might be my issue if the actually did flip.

Joe

Re: K64 Sub-Family Ref Manual -- type-O or EMAC Enhanaced Buff really change

JHinkle — Thu, 11 Aug 2016 19:10:22 GMT

Looking closer -- looks like Offsets 8 and A also changed!

Re: K64 Sub-Family Ref Manual -- type-O or EMAC Enhanaced Buff really change

Robin_Shen — Mon, 15 Aug 2016 01:07:17 GMT

Hi joe,

There is a comment in K60 RM as follows just above the buffer descriptor description.

NOTE

The following addresses are shown for a big endian implementation.

Actually the module chapter is borrowed from original Coldfire device which is big endian architecture. When Kinetis (little endian) first introduce, the module chapter is not changed directly, just added a comment there. With later Kinetis device like K64/K65, associated information is updated and the comment removed.

Best Regards,

Robin

Re: K64 Sub-Family Ref Manual -- type-O or EMAC Enhanaced Buff really change

JHinkle — Mon, 15 Aug 2016 14:12:10 GMT

Robin:

Kinetis is a little endian device so why have documentation published that related to big endian.

I guess that means Kinetis users will have to be very careful when looking at published register assignments to verify if they are based on big/little endian configuration.

Thanks for clarifying.

Joe