MB86613S Datasheet, PDF (72/134 Pages) Fujitsu Component Limited. – IEEE1394 Open HCI Controller

Preliminary
4.3.4. Packet Format
Figure 4.32 shows the isochronous transmit packet format, that is to be transmitted from the work memory or
host memory to the FIFO. Link- Tx block converts format of these packets shown from Open HCI to 1394 and
transmits it onto 1394 bus.
31
16 15
0
spd tag chanNum tCodeA
sy
dataLength
isochronous data
Fig. 4.32 Isochronous Transmit Packet Format
Bit
----
3- bit
Field Name
--------------
spd
description
----------------------------------------------------
Set the packet transfer speed:
000b : 100Mbps
001b : 200Mbps
010b : 400Mbps
2- bit tag
Set the tag code that clarifies the isochronous data format.
6- bit chanNum
Set the channel of data to be transmitted.
4- bit tCode
Set the tcode (transaction code).
4- bit sy
Set the sync bit code.
16- bit dataLength
Set the byte count of block data section for the transmit packet.
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