MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
19-62
Freescale Semiconductor
Figure 19-36. CFIFO Entry Pointer Example
19.4.3.2
CFIFO Prioritization and Command Transfer
The CFIFO priority is fixed according to the CFIFO number. A CFIFO with a smaller number has a higher
priority. When commands of distinct CFIFOs are bound for the same destination (the same on-chip ADC),
the higher priority CFIFO is always served first. A triggered, not-underflowing CFIFO will start the
transfer of its commands when the following occur:
•
Its commands are bound for an internal command buffer that is not full, and it is the highest priority
triggered CFIFO sending commands to that buffer.
First In
Transfer
Next
Data
Pointer
Last In
Push
Next
Data
Pointer
CFIFO
n
Transfer
Next
Data
Pointer
Push
Next
Data
Pointer
CFIFO
n
First In
Transfer
Next
Data
Pointer
Last In
Push
Next
Data
Pointer
CFIFO
n
After Reset or
Invalidation
Some Entries Pushed
but None Executed
No Entries Pushed
but Some Executed
First In
Transfer
Next
Data
Pointer
Push
Next
Data
Pointer
CFIFO
n
Transfer
Next
Data
Pointer
Push
Next
Data
Pointer
CFIFO
n
First In
Transfer
Next
Data
Pointer
Last In
Push
Next
Data
Pointer
CFIFO
n
No Entries Pushed
but Some Executed
Some Entries Pushed
and Some Executed
Entries Pushed Until
Full and None Executed
First In
Last In
Last In
Valid Entry
Empty Entry
NOTE:
n
= 0, 1, 2, 3, 4, 5
Summary of Contents for MPC5553
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