CXD1948R Просмотр технического описания (PDF) - Sony Semiconductor
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CXD1948R Datasheet PDF : 78 Pages
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CXD1948R
5-5. Isochronous Packet Structure
The basic isochronous packet structure supported by the CXD1948R is illustrated below.
On the CXD1948R, CIPHeaders 1 and 2 are automatically attached/detected in conformity to AV protocol.
Also, a source packet header is automatically added/detected on the transport stream packet based on the
MPEG Data Transmission for IEEE1394 Digital Interface specifications proposed in DVB-SMI.
When one source packet is transmitted in one isochronous cycle, 1st quadlet is 1394Header, 2nd quadlet is
Header_CRC (added at Link Core), 3rd quadlet is CIPHeader1, 4th quadlet is CIPHeader2, 5th quadlet is source
packet header and 6th quadlet and after is the data area. The final quadlet is Data_CRC (added at Link Core).
When a dummy packet is transmitted, there are only 1394Header, Header_CRC, CIPHeader1, CIPHeader2
and Data_CRC.
Basic Structure
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1394Header
data length
tag
channel
reserved speed
sy
Header CRC
CIPHeader1 0 0
SID
DBS
FN
QPC SPH reserved
DBC
CIPHeader2 1 0
FMT
TF
FDF
SPHeader
Reserved
TimeStamp
Data
Data_CRC
Note: The diagonally shaded areas ( ) for 1394Header and CIPHeader1 and 2 are attached automatically by
the CXD1948R. Other areas are set from the external microcomputer via the host I/F.
In transmission from the CXD1948R to an IEEE 1394PHYIC, the four bits marked "reserved" and "speed"
of the 1394Header are automatically replaced by "tcode".
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