PDI1394L40 datasheet(29/80 Pages) PHILIPS

29 / 80 page

Philips Semiconductors

Preliminary specification

PDI1394L40

1394 enhanced AV link layer controller

2000 Dec 15

Table 1.

Asynchronous Transmit Fields

Field Name

Description

spd

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

tLabel

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.

tCode

The transaction code for this packet.

DestinationID

Contains a node ID value.

DestinationOffsetHigh

DestinationOffsetLow

The concatenation of these two field addresses a quadlet in the destination node’s address space.

rCode

Response code for write response packet.

rCode

Meaning

Node successfully completed requested operation.

1–3

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.

8–Fh

Reserved

channel

A channel allocated from the isochronous manager register CHANNELS_AVAILABLE.

tag

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.

priority

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.

Quadlet data

For quadlet write requests and quadlet read responses, this field holds the data to be transferred.

Data length

The number of bytes requested in a block read request.

dataLength

The number of bytes of data to be transmitted in this packet

extendedTcode

The tCode indicates a lock transaction, this specifies the actual lock action to be performed with the data in this

packet.

block data

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.

padding

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.

PDI1394L40 データシート(PDF) 29 Page - NXP Semiconductors

PDI1394L40 データシート(HTML) 29 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80

データシートダウンロード