Altera SerialLite II Protocol - Manual (Page 29)

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SerialLite II Protocol Reference Manual
SerialLite II Specification
Training Sequence
The SerialLite II protocol uses the training sequences {|TS1|}, {|TS2|},
and {|TDS|} during the link and lane initialization process. Training
sequences provide the following important functions.
■ Lane identification—The second field in the training sequence
uniquely identifies the lane number.
■ Link width—The third field in the training sequence identifies the
total number of lanes in a particular link by specifying the maximum
lane number.
■ Transfer size—The fourth field in the training sequence defines the
number of columns for a contiguous burst of data; 1 column, 2
columns, 4 columns, and all other values are reserved.
■ Lane polarity—For {|TS1|}, the TID field normally read as /T1/
(D10.2) is read as /!T1/ (D21.5) when lane polarity is inverted.
Likewise for {|TS2|}, the TID field normally read as /T2/ (D5.2) is
read as /!T2/ (D26.5) when lane polarity is inverted.
Acknowledging Link Training State Machine
Figure 2–13 shows the acknowledging link training state machine.