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TC1784
FlexRay™ Protocol Controller (E-Ray)
User´s Manual
20-255
V1.1, 2011-05
E-Ray, V3.13
20.7
Module Service Request
In general, service requests provide a close link to the protocol timing as they are
triggered almost immediately when an error or status change is detected by the
controller, a Frame is received or transmitted, a configured timer service request is
activated, or a stop watch event occurred. This enables the Host to react very quickly on
specific error conditions, status changes, or timer events. On the other hand too many
service requests can cause the Host to miss deadlines required for the application.
Therefore the Communication Controller supports disable / enable controls for each
individual service request source separately.
An service request may be triggered when
•
An error was detected
•
A status flag is set
•
A timer reaches a preconfigured value
•
A message transfer from Input Buffer to Message RAM or from Message RAM to
Output Buffer has completed
•
A stop watch event occurred
Tracking status and generating service requests when a status change or an error
occurs are two independent tasks. Regardless of whether an service request is enabled
or not, the corresponding status is tracked and indicated by the Communication
Controller. The Host has access to the actual status and error information by reading the
Error Service Request Register
and the Status Service Request
Register.
Содержание TC1784
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