Altera SerialLite II Protocol - Manual (Page 23)

Altera Corporation 23
SerialLite II Protocol Reference Manual
SerialLite II Specification
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See “User Packet Encapsulation” on page 2–37 for more information on
packet encapsulation, and “Channel Multiplexing” on page 2–56 for
more information on multiplexing channels.
Start of Data Packet Sequence {SDP}
The start of data packet sequence consists of two symbols, as shown in
Table 2–6 . The first symbol is the /SDP/ control symbol. The second
symbol is a data code-group that you can use to convey a channel number
for channel multiplexing.
Start of Priority Packet Sequence {SPP}
The start of priority packet sequence consists of two symbols as shown in
Table 2–7 . The first symbol is the /SPP/ control symbol. The second
symbol is a data code-group that is divided into two sections. The upper
nibble contains a segment identification number and is used for retry-on-
error (see
“Retry-on-Error (Optional)” on page 2–64 ). The lower nibble
can be used to convey a channel number for channel multiplexing.
End of Good Packet Sequence {EGP}
The end of good packet sequence consists of two symbols, as shown in
Table 2–8 on page 2–24 . It is used to mark the end of a packet that has left
the transmitter without errors. The first symbol is the /EGP/ control
symbol. The second symbol is a data code-group that can be used to
Table 2–6. {SDP} Composition
Field Symbol Description
SDP1 /SDP/ Start of data packet symbol
SDP2 /DAT/ Channel number
Table 2–7. {SPP} Composition
Field Symbol Description
SPP1 /SPP/ Start of priority packet symbol
SPP2 /DAT/ Segment identification/channel number