Altera SerialLite II Protocol - Manual (Page 12)

12 Altera Corporation
SerialLite II Protocol Reference Manual
Physical Layer Description
Data Link Layer
The Data Link layer describes packet encapsulation, link initialization,
lane bonding, lane striping, flow control, and packet retransmission
request commands.
Transmit Direction
■ Packet encapsulation
■ Packet nesting
■ Idle character generation
■ Flow control (optional)
■ CRC generation (optional)
■ Lane striping for multi-lane link
■ Priority packet retry-on-error handling (optional)
Receive Direction
■ Packet encapsulation removal
■ Nested packet separation
■ Lane stripping
■ Idle character deletion
■ CRC verification (optional)
■ Flow control commands generation (optional)
■ Error handling
■ Priority packet retry-on-error commands (optional)
Physical Layer
Description The Physical layer consists of an electrical sublayer and a logical sublayer.
The electrical sublayer converts the electrical signals from a serial bit
stream into characters and provides a synchronous clock to the logical
sublayer. The logical sublayer handles the character alignment, symbol
encoding, link initialization and training, lane alignment, and clock
compensation.
The SerialLite II protocol uses control characters to identify link
information that is embedded into the data stream. This information
allows multiple channels to be easily bonded together, matching the
application's throughput requirements to the link capacity.