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TC1784
Analog to Digital Converter (ADC)
User´s Manual
23-61
V1.1, 2011-05
ADC, V1.3
slot 0 does not provide intermediate queue stages (1-stage queue with only queue
stage 0), whereas the ones in arbitration slots 2 and 4 provides 3 intermediate queue
stages in additional to queue stage 0 (leading to a 4-stage queue each).
23.2.11.1 Overview
A sequential request source performs the:
•
Queue input:
The queue input represents the programming interface where the sequence is
defined (see
). It does not provide any buffer capability, but
handles the filling of the queue buffer (queue stage 0 plus optional intermediate
queue stages) by writing data to it. The contents of the queue stages can not be
directly modified by program, except by the command for flushing the complete
queue.
The queue input also handles the refill mechanism, an automatic re-insertion of a
started conversion from queue stage 0 (including the control parameters) as new
queue input. This feature allows a single setup (by SW) of a conversion sequence
and multiple repetitions of the same sequence without the need to re-program it each
time. A conversion sequence is repeated if all queue entries of the sequence are
setup for refill mode.
•
Queue stage 0:
The contents of this queue stage defines which channel will be requested next for a
conversion (see
,
). It also defines if the request should be
triggered by an external event or if the requested conversion should follow the
previous one as soon as possible. It also enables the request source interrupt
generation after the conversion.
The contents of this queue stage is cleared when the requested conversion is started
and the next queue entry can be handled (if available).
•
Queue backup stage:
The queue backup stage is used to store the request control parameters when a
conversion requested by this request source is aborted. A validation bit indicates that
the aborted conversion has to be requested next (before the current contents of
queue stage 0) to maintain the original sequence (see
•
Request handling:
The request handling block interfaces with the request source arbiter. It requests a
conversion due to a valid information in queue stage 0 and handles the conversion
status information. The control of the queue sequence is done based on bits in
registers
, and
(for the arbitration slot x).
•
Trigger and gating signal handling:
The trigger and gating unit interfaces with signals and modules outside the ADC
module that can request conversions. For example, a timer unit can issue a request
signal to synchronize conversions to PWM events. A trigger event can start a
conversion request for the entry in queue stage 0 (see
,
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