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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
19-83
hardware implementation has only four entries. In this example, RFIFO
n
with 16 entries is shown in
sequence after popping or receiving entries.
Figure 19-47. RFIFO Entry Pointer Example
19.4.4.2
Distributing Result Data into RFIFOs
Data to be moved into the RFIFOs can come from three sources: from ADC0, from ADC1, or from the
external device. All result data comes with a MESSAGE_TAG field defining what should be done with
the received data. The FIFO control unit decodes the MESSAGE_TAG field and:
•
Stores the 16-bit data into the appropriate RFIFO if the MESSAGE_TAG indicates a valid RFIFO
number or
First In
Pop
Next
Data
Pointer
Last In
Receive
Next
Data
Pointer
RFIFO
n
Pop
Next
Data
Pointer
Receive
Next
Data
Pointer
RFIFO
n
First In
Pop
Next
Data
Pointer
Last In
Receive
Next
Data
Pointer
RFIFO
n
After Reset or
Invalidation
Some Entries Received
but None Popped
No Entries Received
but Some Popped
First In
Pop
Next
Data
Pointer
Receive
Next
Data
Pointer
RFIFO
n
Pop
Next
Data
Pointer
Receive
Next
Data
Pointer
RFIFO
n
First In
Pop
Next
Data
Pointer
Last In
Receive
Next
Data
Pointer
RFIFO
n
No Entries Received
but Some Popped
Some Entries Received
and Some Popped
Entries Received Until
Full and None Popped
First In
Last In
Last In
Valid Entry
Empty Entry
NOTE:
n
= 0, 1, 2, 3, 4, 5
Содержание MPC5553
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