PDI1394L21 データシートの表示（PDF） - Philips Electronics
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PDI1394L21 Datasheet PDF : 52 Pages
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Philips Semiconductors
1394 full duplex AV link layer controller
Preliminary specification
PDI1394L21
Table 3. Block Transmit Field
Field Name
spd, tLabel, rt, tCode, destinationID,
destinationOffsetHigh, destinationOffsetLow, rCode
dataLength
extendedTcode
block data
padding
See Table 2.
Description
The number of bytes of data to be transmitted in this packet
The tCode indicates a lock transaction, this specifies the actual lock action to be
performed with the data in this packet.
The data to be sent. If dataLength=0, no data should be written into the FIFO for
this field. Regardless of the destination or source alignment of the data, the first
byte of the block must appear in the high order byte of the first quadlet.
If the dataLength mod 4 is not zero, then zero-value bytes are added onto the end
of the packet to guarantee that a whole number of quadlets is sent.
12.5.1.4 Unformatted Transmit
The unformatted transmit format is shown in Figure 13. 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.
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
spd
tLabel
1110
0000
unformatted packet data
Figure 13. Unformatted Transmit Format
SV00256
12.5.2 Asynchronous Receive Packet Formats
This section describes the asynchronous receive packet formats. Four basic asynchronous data packet formats and one confirmation format exist:
Table 4. Asynchronous Data Packet Formats
ITEM
FORMAT
1
No-packet data
2
Quadlet packet
3
Block Packet
4
Self-ID / PHY packet
5
Confirmation packet
USAGE
Quadlet read requests
Quadlet/block write responses
Qaudlet write requests
Quadlet read responses
Block read requests
Block write requests
Block read responses
Lock requests
Lock responses
Concatenated self-ID / PHY packets
Confirmation of packet transmission
TRANSACTION CODE
4
2
0
6
5
1
7
9
Bhex
Ehex
8
Each packet format uses several fields. More information about most of these fields can be found in the 1394 specification.
1999 Aug 06
17
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