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Disclosed is a method for automatically detecting the serial communication speed between a controller and a serial I/O device where the device does not have the capability to auto-negotiate.
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Method for Automatic Serial Communication Speed Configuration
In this example a serial I/O device can communicate at two different speeds. The main
idea is to attempt to communicate with the serial I/O device at the highest possible
speed. This is accomplished by first configuring the controller to communicate at the
high speed. After this, the controller sends a message to the serial I/O device in an
attempt to establish communication. In successful operation, the serial I/O device will
respond to this message. If a response is received, the controller stores the serial I/O
device's communication speed and continues normal operation. If the controller is
unable to establish communication, it changes its communication speed and sends
another message to the serial I/O device. If the serial I/O device responds with a
message, the controller stores the serial I/O device's communication speed and
continues with normal operation. If no communication is established and all possible
speed variations are exposed, the controller assumes that the serial I/O device is
currently unavailable and this status is also stored.
This method of speed arbitration removes the need for human interaction. In the event
that there are 192 drives that need to be configured with the controller to communicate
at the highest possible speed, this speed arbitration method automates this process and
reduces the amount of user error that can be introduced.