TC1784
Analog to Digital Converter (ADC)
User´s Manual
23-42
V1.1, 2011-05
ADC, V1.3
23.2.7
Request Source Arbiter
The request source arbiter evaluates which analog input channel has to be converted.
Therefore, it regularly polls the request sources one after the other for pending
conversion requests. The polling sequence is based on time slots with programmable
length, called arbitration slots. If a request source is disabled or if no request source is
available for an arbitration slot, the slot is considered as being empty and has no
influence on the evaluation of the arbitration winner. After reset, all request sources are
disabled and have to be enabled by bits in register
to take part in the arbitration
process.
The number of arbitration slots forming an arbitration round can be programmed to
obtain a similar arbiter timing for different devices, even if the number of available
request sources differs from one device to another. At the end of each arbitration round,
the arbiter has determined the request source with the highest priority and a pending
conversion request. This arbitration result is stored as arbitration winner for further
actions. If a conversion is started in an arbitration round, this arbitration round does not
deliver an arbitration winner.
In the TC1784, the following request sources are available:
•
Request source 0
in arbitration slot 0:
1-stage sequential source
This request source can issue a conversion request for a single input channel.
•
Request source 1
in arbitration slot 1:
16-channel scan source
This request source can issue a conversion request sequence of up to 16 input
channels in a defined order.
•
Request source 2
in arbitration slot 2:
4-stage sequential source
This request source can issue a conversion request sequence of up to 4 input
channels in a freely programmable order.
•
Request source 3
in arbitration slot 3:
16-channel scan source
This request source can issue a conversion request sequence of up to 16 input
channels in a defined order.
•
Request source 4
in arbitration slot 4:
4-stage sequential source
This request source can issue a conversion request sequence of up to 4 input
channels in a freely programmable order.
•
Last arbitration slot of the arbitration round:
Synchronization source
In this slot, the arbiter checks for a synchronized request from another ADC kernel
and does not evaluate any internal request source. A request for a synchronized
conversion is always handled with the highest priority in a synchronization slave
kernel (pending requests from other sources are not considered).
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