FB_CSPMCR field descriptions (continued)
Field Description
23–20
GROUP3
FlexBus Signal Group 3 Multiplex control
Controls the multiplexing of the FB_CS5 , FB_TSIZ1, and FB_BE_23_16 signals.
0000 FB_CS5
0001 FB_TSIZ1
0010 FB_BE_23_16
Any other value Reserved
19–16
GROUP4
FlexBus Signal Group 4 Multiplex control
Controls the multiplexing of the FB_TBST , FB_CS2 , and FB_BE_15_8 signals.
0000 FB_TBST
0001 FB_CS2
0010 FB_BE_15_8
Any other value Reserved
15–12
GROUP5
FlexBus Signal Group 5 Multiplex control
Controls the multiplexing of the FB_TA , FB_CS3 , and FB_BE_7_0 signals.
NOTE:
When GROUP5 is not 0000b, you must write 1b to the CSCR[AA] bit. Otherwise, the bus hangs
during a transfer.
0000 FB_TA
0001 FB_CS3 . You must also write 1b to CSCR[AA].
0010 FB_BE_7_0 . You must also write 1b to CSCR[AA].
Any other value Reserved
Reserved This field is reserved.
This read-only field is reserved and always has the value 0.
31.4 Functional description
31.4.1 Use cases
In general, FlexBus supports the following use cases, but note that your device may not
support all of these use cases, because of limitations imposed by your specific package's
pinouts:
• Multiplexed 32-bit address and 32-bit data
• Multiplexed 32-bit address and 16-bit data (non-multiplexed 16-bit address and 16-
bit data)
Chapter 31 External Bus Interface (FlexBus)
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 703
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