Altera SerialLite II Protocol Bedienungsanleitung Seite 64
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64 Altera Corporation
SerialLite II Protocol Reference Manual
Data Link Layer Description
Effect of Link Management Packet Corruption
If a flow control link management packet is corrupted, it is discarded and
the near transmitter continues to send data. The data may overrun the far
receiver FIFO buffers. Buffer overrun triggers a link error and initiates the
link initialization process of “Link Initialization and Training”.
Retry-on-Error (Optional)
Implementation of the retry-on-error mechanism is optional for the
priority port.
The priority port always transfers segments in the order they were
received and retransmits them in the required order. The segment ID
associated with each priority packet segment ensures this sequence is
maintained.
For the purposes of this specification, the link consists of a near
transmitter sending the priority packets to a far receiver and a far
transmitter sending link management packets to the near receiver.
Retry-on-error is a mechanism that allows the far end to request
retransmission of segments when an error is detected by the far receiver.
This mechanism requires the far transmitter to acknowledge every
segment received. There are two types of acknowledgement:
■ ACK: The received segment is good and error-free.
■ NACK: The received segment contains an error. If the retry-on-error
option is enabled, retransmit all segments starting from the segment
with errors. (If the retry-on-error option is not enabled, raise a data
error.)
If the retry-on-error option is not enabled, all segments are transmitted
without any acknowledgements from the receiver.
Retry-on-Error Link Management Packet Format
Table 2–22 specifies the retry-on-error packet format, and Table 2–23
specifies the retry-on-error packet parameter values.
Table 2–22. Retry-On-Error Packet Format
Bit[23:20] Bit[19:16] Bit[15:12] Bit[11:8]
Link packet type Link packet parameter
0x2 CLASS Reserved = 0x0 SID
- SerialLite II Protocol 1
- Reference Manual 1
- MNL-SLITE2-1.0 2
- Table of Contents 3
- About This Manual 5
- Glossary 6
- Altera Corporation vii 7
- SerialLite II 9
- Specification 9
- Architectural 10
- Overview 10
- Physical Layer 11
- Description 12
- Signal Definitions 13
- Interface Diagrams 13
- Electrical Specifications 14
- Driver Characteristics 15
- Receiver Characteristics 15
- Symbol Encoding 16
- Notation Convention 17
- Transmission Order 18
- Altera Corporation 19 19
- SerialLite II Specification 19
- Running Disparity Rules 20
- Valid and Invalid code-groups 20
- Control Symbols 21
- Comma /COM/ 21
- Align /ALN/ 21
- Idle /IDL/ 21
- Control Sequences 22
- Ordered Sequences 25
- 28 Altera Corporation 28
- Physical Layer Description 28
- Training Sequence 29
- 30 Altera Corporation 30
- Altera Corporation 31 31
- 32 Altera Corporation 32
- Altera Corporation 33 33
- 34
- Scrambling (Optional) 35
- Data Link Layer 36
- Altera Corporation 37 37
- Link Management Packets 38
- Type BIP-8 40
- BIP-8 Coverage 40
- Parameter 40
- User Data 41
- Interruption (or under-run) 42
- SLP Link Management 43
- SPP Prioirity Payload EGP 43
- SDP Data Payload EGP 43
- Multi-Lane Alignment 44
- Data Transmission Rules 45
- Lane Alignment Examples 45
- 46 Altera Corporation 46
- Data Link Layer Description 46
- Altera Corporation 47 47
- 48 Altera Corporation 48
- Altera Corporation 49 49
- 50 Altera Corporation 50
- Altera Corporation 51 51
- Transfer Size 52
- Altera Corporation 53 53
- 54 Altera Corporation 54
- Altera Corporation 55 55
- Channel Multiplexing 56
- Data Packets 57
- Priority Packets 57
- 58 Altera Corporation 58
- Altera Corporation 59 59
- 60 Altera Corporation 60
- Flow Control (Optional) 61
- Flow control time 62
- Altera Corporation 63 63
- Retry-on-Error (Optional) 64
- Segment Identification (SID) 65
- Segment Buffers 65
- Segment Acknowledgement Timer 66
- Altera Corporation 67 67
- Error Events & 69
- Handling 69
- Catastrophic Error Events 71
- Link Error Events 71
- Data Error Events 72
- Data Error Threshold 73
- Packets Marked Bad 74
- 8b/10b Code 75
- References 83
- -GX White 84
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