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a DSA protocol ? |
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DSA
communication protocol |
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Introduction
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The DSA
protocol is a communication process used between
the servo/decoding section and the user interface section of a
CD player. It allows a manufacturer to develop his own user software
in order to have a specific user interface, which
would include, for instance, the same display type
as used within the other products of a same range.
However, standard display kit (including user software) are
available for companies which do not want to be
involved at all in software development.
Another
advantage of the DSA interface is compatibility :
two CD players which include different DSA based
modules can use the same user section, since
the interface is similar. This gives the possibility
to propose products in different ranges, with the same
user interface but with different CD mechanisms. It also
facilitates upgrades of products with new CD
mechanisms.
Indeed, the DSA interface has been
present in many CD applications for several years
now. And up coming applications will be also based
on the same DSA interface in order to allow a smooth
evolution in product's design.
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Functional diagram
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The DSA-interface
is an interface used for communication between two
processors. One is called the servo processor or DSA
processor, and the other the user processor.
The servo processor in the CD-module controls all
servo activities, like disc spinning, audio data
retrieving, error correction,
subcode decoding, etc.
The user processor controls the servo processor via
the DSA-interface, thanks to high-level commands
like 'play track n°xx', 'read TOC', 'open tray',
etc.
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Next
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