PDI1394L41 Datasheet, PDF (35/81 Pages) NXP Semiconductors – 1394 content protection AV link layer controller

Philips Semiconductors
1394 content protection AV link layer controller
Preliminary specification
PDI1394L41
12.6.2.5 Unformatted Transmit
The unformatted transmit format is shown in Figure 21. The first quadlet contains packet control information. The remaining quadlets contain
data that is transmitted without any formatting on the bus. No CRC is appended on the packet, nor is any data in the first quadlet sent. This is
used to send PHY configuration and Link-on packets. Note that the bit-inverted check quadlet must be included in the FIFO since the AV Link
core will not generate it.
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spd
tLabel
00
1110
priority
unformatted packet data
Figure 21. Unformatted Transmit Format
SV01087
12.6.2.6 Asynchronous Stream Transmit
The PDI1394L41 supports asynchronous stream as specified in IEEE1394.a. The asynchronous stream packet format is shown below. The first
quadlet contains packet control information. The second quadlet contains datalength, tag, channel number, and synchronization code. The third
quadlet contains the datalength in quadlets. The datalength can be zero for empty asynchronous stream packets.
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spd
tLabel
1
1110
priority
dataLength
tag
channel
1010
sy
Block data
padding (if needed)
SV01050
Figure 22. Asynchronous Stream Packet Transmit Format
When a packet conforming to this format is written to either asynchronous transmit FIFO, an asynchronous stream packet (identical on the
cable to an isochronous packet) will be transmitted during the asynchronous phase of a bus cycle.
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