
Altera Corporation 21
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
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