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Altera Corporation 41
SerialLite II Protocol Reference Manual
SerialLite II Specification
f Refer to “Effect of Link Management Packet Corruption” on page 2–64
and “Effect of Link Management Packet Corruption” on page 2–69 for
details.
Idle Generation
The transmitter sends idles across the link when there is no packet
information or special ordered sets to be sent.
There are four scenarios where IDL characters are transmitted:
1. During the link initialization and training. See “Link Initialization
and Training” on page 2–27 for more information.
2. There is no user data to transmit and idles are needed as
inter-packet fill, as shown in Figure 2–20.
Figure 2–20. Idle Used as Inter-Packet Fill
The current packet must finish or be interrupted with a break-packet
sequence. The transmission of regular packet data can be resumed
with the CDP or start of a user packet (SDP or SPP). Either all zero
bytes or the special /IDL/ characters are injected between packets.
The idle data must be ignored and dropped by the receiver. All
running disparity errors are counted as a data error as the status of
the link is monitored.
To reduce EMI, sending all zero ordered sets as inter-packet fill with
scrambling enabled is recommended. This option eliminates
repeating characters, which has great effect at high data rates.
For simpler implementations, the transmitter could choose to inject
only ||IDL|| ordered sets between packets or segments. The receiver is
required to discard all zero ordered sets between packet segments
without raising an error.
3. When data or priority packets are interrupted at the system
interface, or when the transmit link layer device under-runs, or
when the flow control command is received.
SDP
User Data
EGP Idle Idle SDP User Data EGP Idle
- 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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