Altera SerialLite II Protocol Manuel d'utilisateur télécharger pdf (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.

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Altera SerialLite II Protocol Manuel d'utilisateur Page 29