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SL100/SL240 PROTOCOL
Copyright 2017
7-3
FibreXtreme Hardware Reference
7.3
Frames
There are four basic frame types defined in VITA 17.1 – an IDLE frame, data frame, a
SYNC without data frame, and a SYNC with data frame. The data is divided into frames
so the FPDP signals are sampled at some minimum interval, and so the receiver is
guaranteed to see IDLEs to maintain synchronization. SYNC is used to delimit data
streams and maintain host program synchronization. This signal is under user control for
PCI-based products, and is the same as the FPDP /SYNC signal for CMC/FPDP based
products. Whenever a SYNC appears on the output of the Transmit FIFO, the current
frame is terminated and the proper SYNC frame (SYNC with data or SYNC without
data) is sent. Figure 7-1 shows the four types of frames and the ordered set placement
within those frames.
Figure 7-1 VITA 17.1 Framing Protocol
IDLE
SOF
CRC
GO
STOP
SEOF
FEOF
IDLE Fiber Frame
IDLE
SOF
CRC
GO
STOP
SEOF
FEOF
1 To 512 4-Byte Data Words
(Maximum 2048 Bytes)
Data Fiber Frame
SWDV
SOF
CRC
GO
STOP
SEOF
MEOF
1 Data Word (4 Bytes)
(No More – No Less)
Sync With Data Fiber Frame
IDLE
SOF
CRC
GO
STOP
SEOF
MEOF
Sync Without Data Fiber Frame
See
Note
See
Note
See
Note
See
Note
OPTIONAL: Adds one word of overhead
NOTE: If the Copy Master Mode bit in the Link Control Register is set, three additional
IDLE ordered sets are inserted at the beginning of each frame.
Five words overhead required per frame
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