pdi1394l40 NXP Semiconductors, pdi1394l40 Datasheet - Page 29

• Manufacturer Part Number: pdi1394l40
• Description: 1394 Enhanced Av Link Layer Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 1. Asynchronous Transmit Fields
2000 Dec 15
spd
tLabel
rt
tCode
DestinationID
DestinationOffsetHigh
DestinationOffsetLow
rCode
channel
tag
sy
priority
Quadlet data
Data length
dataLength
extendedTcode
block data
padding
1394 enhanced AV link layer controller
Field Name
This field indicates the speed at which this packet is to be sent. 00=100 Mbs, 01=200 Mbs, and 10=400 Mbs.
11 = undefined
This field is the transaction label, which is used to pair up a response packet with its corresponding request packet.
tLabels are also used as identifiers to associate a Link data confirmation (see 12.6.2.13) with the corresponding
request, response, or asynchronous stream packet.
Only value 01 = retryX is supported.
The transaction code for this packet.
Contains a node ID value.
The concatenation of these two field addresses a quadlet in the destination node’s address space.
Response code for write response packet.
A channel allocated from the isochronous manager register CHANNELS_AVAILABLE.
Used only for Asynchronous stream transmit fields Values supplied as appropriate by the user
Used only for Asynchronous stream transmit fields. Values supplied, as appropriate, by the user.
For responses, priority is set to 0000 if fair arbitration is to be used and to 0001 if priority arbitration is to be used, as
allowed by the 1394a supplement to Std IEEE 1394–1995.
For quadlet write requests and quadlet read responses, this field holds the data to be transferred.
The number of bytes requested in a block read request.
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.
rCode
8–Fh
1–3
0
4
5
6
7
Meaning
Node successfully completed requested operation.
Reserved
Resource conflict detected by responding agent. Request may be retried.
Hardware error. Data not available.
Field within request packet header contains unsupported or invalid value.
Address location within specified node not accessible.
Reserved
26
Description
PDI1394L40
Preliminary specification