CXD1948R Просмотр технического описания (PDF) - Sony Semiconductor
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CXD1948R Datasheet PDF : 78 Pages
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CXD1948R
1394Header Fields
Field Name
data_length
tag
channel
speed
sy
Description
Indicates the byte length of data from CIPHeader1.
Type of format for data transferred as isochronous packet.
00: no Header
01: format defined by AV protocol
10: Reserved
11: Reserved
Channel number used by the transmitted packet.
Defines transfer speed.
00: 100Mbit/s
01: 200Mbit/s
10: 400Mbit/s
11: Undefined
The CXD1948R supports “00” and “01”.
This field is defined by the application.
Note: The Link Core must be informed of the communication speed in the case of isochronous communication,
so [5 : 4] of [7 : 4], where a tCode is inserted, is used as the speed code. This is replaced with tCode
(1010) at the Link Core.
CIPHeader1 Fields
Field Name
SID
DBS
FN
QPC
SPH
DBC
Description
The CXD1948R Node ID. (0 to 3Fh)
The number of quadlets transferred in one isochronous packet.
For DVB specifications, this is “00000110b” and for DSS specifications, “00001001b”.
Indicates how many data blocks a source packet is divided into.
The number of quadlets added to an incomplete packet when the source packet
is split. Fixed at “0h” on the CXD1948R.
Expresses whether a source packet header is used or not. Fixed at “1” on the
CXD1948R.
Increased by one for each data block. This is a free run continuity counter.
When multiple data blocks are to be sent as a single isochronous packet,
indicates the value for the first data block.
CIPHeader2 Fields
Field Name
FMT
TF
FDF
Description
Data format ID.
This is “100000b” for DVB and “100001b” for DSS specifications.
Indicates whether data is time-shifted. 1 if time-shifted; 0 if not time-shifted.
Used in application defined by FMT.
The value set via the host I/F is input as is on the CXD1948R.
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