Altera SerialLite II Protocol - Manual (Page 21)

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SerialLite II Protocol Reference Manual
SerialLite II Specification
Control Symbols
This section defines the individual symbols used either alone or as part of
control sequences, see
Table 2–5 . For simplicity, these symbols are used
instead of their associated code groups.
Comma /COM/
The comma symbol, sometimes called the sync symbol, has a number of
uses. It is used by the physical layer to identify a character boundary, and
it is included in the training sequence for lane initialization and in the
clock compensation sequence.
Align /ALN/
The align symbol is never used alone. It is part of the link deskew
sequence.
Idle /IDL/
The idle symbol is used when no complete transfer of data is available to
send or to fill inter-packet gaps. It is part of the clock compensation
sequence.
Table 2–5. Description of the Control Symbols
Name Description 8b10b Hex
/COM/ Comma (Sync) K28.5 0xBC
/ALN/ Align K28.3 0x7C
/IDL/ Idle (Skip) K28.0 0x1C
/SPP/ Start of priority packet K28.1 0x3C
/SDP/ Start of data packet K28.2 0x5C
/CPP/ Continuation of priority packet K28.4 0x9C
/CDP/ Continuation of data packet K28.6 0xDC
/SLP/ Start of link management packet K23.7 0xF7
/SUP/ Suspend user packet K27.7 0xFB
/EGP/ End of good packet K29.7 0xFD
/EBP/ End of bad packet K30.7 0xFE
/DAT/ Normal data. Dx.y 0xXX