Altera SerialLite II Protocol - Manual (Page 52)

52 Altera Corporation
SerialLite II Protocol Reference Manual
Data Link Layer Description
Figure 2–31. Illegal Multi-Lane Alignment
Transfer Size
The concept of sending data in bursts is used to support high data rates
with a minimal amount of resources. A parameter called transfer size
defines the granularity of the data burst. Data transfers are required to be
sent contiguously until the end-of-packet or a multiple of the transfer
size. Shorter packets are padded with idle characters until a multiple of
the transfer size is reached. Control sequences, such as the clock
compensation sequence and link management packets, should not
interrupt the data transfer until the next multiple of the transfer size. Any
number of control characters can be sent between data transfers.
Time
SLP LD 0
LD 1 LD 2
Illegal: CRC must follow end-of-
packet.
IDL IDL IDL IDL
Illegal: Link Mgmt packet
cannot occupy same column
as Data packet
D8
IDL
D 12
D0
D4
D9
IDL
D 13
D1
D5
D 10
SDP1
D 14
D2
D6
D 11
0 0
D 15
D3
D7
D8
D 12
D0
D4
D9
D 13
D1
D5
D 10
D2
D6
D 11
D3
D7
SUP1 0 1 CDP1 0 0
D 16
IDL
0 0
CDP1 0 1
D 16 IDL
EG P1
Lane
# 0
Lane
# 1
Lane
# 2
Lane
# 3
CRC1
CRC2
PD0
PD4
EG P1
PD1
PD5
0 0
PD2
PD6
IDL
PD3
PD7
IDL
CRC1 CRC2
CRC3 CRC4
SPP1 0 0 IDL IDL
CRC1 CRC2
Illegal: End-of-packet must be
aligned on Lane 0
Illegal: Break data packet is
missing CRC bytes.
IDL IDL
D 17 D 18 D 19
D 20
PD0
PD4
EG P1
PD1
PD5
1 0
PD2
PD6
IDL
PD3
PD7
IDL
CRC1 CRC2 CRC3 CRC4
SPP1 1 0 EG P1 0 1
IDL
D0
IDL
D1 SDP1
D2
0 0
D3
EG P1 0 0
CRC1 CRC2 IDL IDL
IDL IDL
IDL IDL
IDL IDL
SLP LD 0 LD 1 LD 2
Illegal: Start-of-packet must be
aligned to Lane 2
SLP LD 0 LD 1 LD 2
D 14 D 15
D 21
IDL
Illegal: Idles within a packet
must occupy an entire column
or pad end-of-packet
SUP1 0 0
SDP1 0 1
CRC1 CRC2
IDL IDL