Enhanced Queued Analog-to-Digital Converter (eQADC)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
18-78
Freescale Semiconductor
•
The CFIFO is constantly transferring commands and the previous command sequence ended.
•
The CFIFO resumes command transfers after being interrupted.
And a command sequence ended when:
•
An asserted EOQ bit is detected on the last transferred command.
•
CFIFO is in edge-trigger mode and asserted pause bit is detected on the last transferred command.
•
The ADC to which the next command is bound is different from the ADC to which the last
command was transferred.
shows examples of how the eQADC would detect command sequences when transferring
commands from a CFIFO. The smallest possible command sequence can have a single command as shown
in example 3 of
.
Figure 18-41. Command Sequence Examples
The eQADC would check for non-coherency of seven command
sequences, all containing a single command, but NCF would never
get set.
CF
n
_ADCa_CMD
n
– Command
n
in CFIFO
n
bound for ADCa
(ADC3 and ADC4 are external devices associated with external
command buffers 2 and 3).
Assuming that these commands are transferred by a CFIFO
configured for edge trigger mode and the command transfers are
never interrupted, the eQADC would check for non-coherency of
two command sequences: one formed by commands 0, 1, 2, 3, and
the other by commands 4, 5, 6.
Assuming that command transfers from the CFIFO are never
interrupted, the eQADC would check for non-coherency of three
command sequences. The first being formed by commands 0, 1, 2,
the second by commands 3, 4 and the third by commands 5, 6.
Note that even when the commands of this queue are transferred
through a CFIFO in continuous-scan mode, the first three
commands and the last two commands of this command queue
would still constitute two distinct command sequences, although
they are all bound for the same ADC, because an asserted EOQ
ends a command sequence.
User Command Queue with
Two Command Sequences
CF5_ADC1_CM6(EOQ=1)
7
CF5_ADC1_CM5
6
CF5_ADC1_CM4
5
CF5_ADC1_CM3(Pause=1)
4
CF5_ADC1_CM2
3
CF5_ADC1_CM1
2
CF5_ADC1_CM0
1
Example 1
User Command Queue with
Three Command Sequences
CF5_ADC1_CM6(EOQ=1)
7
CF5_ADC1_CM5
6
CF5_ADC0_CM4
5
CF5_ADC0_CM3
4
CF5_ADC1_CM2
3
CF5_ADC1_CM1
2
CF5_ADC1_CM0
1
Example 2
User Command Queue with a
Seven Command Sequence
CF5_ADC1_CM6(EOQ=1)
7
CF5_ADC2_CM5
6
CF5_ADC0_CM4
5
CF5_ADC1_CM3
4
CF5_ADC3_CM2
3
CF5_ADC2_CM1
2
CF5_ADC1_CM0
1
Example 3
Содержание MPC5565
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