PDI1394L21 データシートの表示（PDF） - Philips Electronics

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PDI1394L21

1394 full duplex AV link layer controller

Philips Electronics 

Philips Semiconductors

1394 full duplex AV link layer controller

Preliminary specification

PDI1394L21

12.5.1.3 Block Transmit

The block transmit format is shown below, this is the generic format for reads and writes. The first quadlet contains packet control information.

The second and third quadlets contain the 16-bit destination node ID and either the 48-bit destination offset (for requests) or the response code

and reserved data (for responses). The fourth quadlet contains the length of the data field and the extended transaction code (all zeros except

for lock transaction). The block data, if any, follows the extended transaction code.

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

dataLength

destinationOffsetHigh

destinationOffsetLow

extendedTcode

Block data

padding (if needed)

Figure 11. Block Packet Transmit Format

SV00254

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

dataLength

extendedTcode

Block data

padding (if needed)

SV00255

Figure 12. Block Read or Lock Response Transmit Format

1999 Aug 06

16

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