Where is Flex Bus on the MK22FX1M0VLL12

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Where is Flex Bus on the MK22FX1M0VLL12

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brentgreenwald
Contributor III

In the datasheet for the MK22FX1M0VLL12 the flexbus AD pins 21-23 are missing. Is there any reason why they are not included on the master pin out list? Or is there some other approach to wiring the 32 bit flex bus.

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Hui_Ma
NXP TechSupport
NXP TechSupport

Hi

For the pin resource limitation, the PTB[6~8] were removed from MK22FN1M0VLL12 , which is pin ALT5 function is FB_AD[21:23].

There could not do 32 bit data operation via MK22FN1M0VLL12 Flexbus module.

Customer could select K22 product such as MK22FN1M0VLQ12 or MK22FN1M0VMC12R as a replacement(if customer need to connect external 32-bit port size memory).


Thank you for the attention.

Have a great day,
Ma Hui
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brentgreenwald
Contributor III

But then why dose the chip say it supports 32 bit?

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Hui_Ma
NXP TechSupport
NXP TechSupport

Hi

Thank you for the info. The MK22FN1M0VLL12 reference manual should be updated about related Flexbus module.

I will forward related info to Kinetis product team about this document issue.

Sorry for that may bring any inconvenience to you.

Have a great day,
Ma Hui
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