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
12.5 Link Packet Data Formats
The data formats for transmission and reception of data are shown below. The transmit format describes the expected organization for data
presented to the link at the asynchronous transmit, physical response, or isochronous transmit FIFO interfaces.
12.5.1 Asynchronous Transmit Packet Formats
These sections describe the formats in which packets need to be delivered to the queues (FIFOs) for transmission. There are four basic formats
as follows:
ITEM
1
FORMAT
No-packet data
2
Quadlet packet
3
Block Packet
4
Unformatted transmit
USAGE
Quadlet read requests
Quadlet/block write responses
Quadlet write requests
Quadlet read responses
Block read requests
Block write requests
Block read responses
Lock requests
Lock responses
Concatenated self-ID / PHY packets
TRANSACTION CODE
(tCode)
4
2
0
6
5
1
7
9
Bhex
Ehex
Each packet format uses several fields (see names and descriptions below). More information about these fields (not the format) can be found
in the 1394 specification. Grey fields are reserved and should be set to zero values.
12.5.1.1 No-data Transmit
The no-data transmit formats are shown in Figures 6 and 7. The first quadlet contains packet control information. The second and third quadlets
contain 16-bit destination ID and either the 48-bit, quadlet aligned destination offset (for requests) or the response code (for responses).
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
0 spd
tLabel
rt
tCode 0000
destinationID
destinationOffsetHigh
destinationOffsetLow
SV00250
Figure 6. Quadlet Read Request Transmit Format
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
0 spd
tLabel
rt tCode
0000
destinationID
rCode
1999 Aug 06
SV00249
Figure 7. Quadlet/Block Write Response Packet Transmit Format
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