Altera SerialLite II Protocol Bedienungsanleitung Seite 59

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Altera Corporation 59
SerialLite II Protocol Reference Manual
SerialLite II Specification
Figure 2–37. CRC Alignment for Eight Lanes
Breaking data packets is treated like the end-of-packet as the CRC is
appended to the two byte SUP sequence. The CRC is calculated over that
burst of user data. When the packet is resumed, the initial value used is
the all ones pattern as described below. This allows burst transfers to be
verified before the end-of-packet. As the CRC is computed on each burst
instead of the entire packet, saving of context is not required and the CRC
remainder is discarded making implementation simpler. Having the CRC
computed only over the burst is advantageous for systems using large
packet sizes or susceptible to high bit error rates.
Figure 2–38. SUP Sequence followed by CRC
Time
D8
IDL
D12
D16
PD0 PD4
D0 D4
D9
IDL
D13
PD1 PD5
D1 D5
D10 D14
PD2 PD6
D2 D6
D11 D15
PD3 PD7
D3 D7
CRC1 CRC2 CRC3 CRC4
EGP1 EGP2 SPP1 SPP2
IDL
EGP1
IDL
EGP2
SDP1
IDL
SDP2
IDL
IDL IDL
IDL IDLIDL
Lane
#0
Lane
#1
Lane
#2
Lane
#3
Lane
#4
Lane
#5
Lane
#6
Lane
#7
IDL IDL IDL IDL
IDL IDL IDL IDL
CRC-32
D8
IDL
D12
D0
D4
D9
IDL
D13
D1
D5
D10
SDP1
D14
D2
D6
D11
00
D15
D3
D7
D8
SUP1
D12
D0
D4
D9
00
D13
D1
D5
D10
SDP1
D14
D2
D6
D11
01
D15
D3
D7
SUP1 01
CDP1 00
D16 IDL IDL IDL
EGP1 00
CDP1 01
D16 IDL IDL IDL
EGP1 01
IDL IDL
Lane
#0
Lane
#1
Lane
#2
Lane
#3
CRC1 CRC2
CRC3 CRC4
CRC1 CRC2
CRC3 CRC4
CRC1 CRC2
CRC3 CRC4
CRC1 CRC2
CRC3 CRC4
Time
Suspended packet
followed by CRC-32
Suspended packet
followed by CRC-32
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