Philips Semiconductors

Preliminary specification

PDI1394L21

1394 full duplex AV link layer controller

1999 Aug 06

21

destinationID

tLabel

rt

tCode

priority

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

destinationOffsetHigh

destinationOffsetLow

sourceID

data length

SV00261

spd

ackSent

31 30

Figure 18. Block Read Request Receive Format

12.5.2.3

Block receive

The block receive format is shown below. The first quadlet contains the destination node ID and the rest of the packet header. The second and

third quadlets contain 16-bit sourceID 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 transactions).

The block data, if any, follows the extended code. The last quadlet contains packet reception status.

dataLength

extendedTcode

Block data

padding (if needed)

destinationID

tLabel

rt

tCode

priority

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

destinationOffsetHigh

destinationOffsetLow

sourceID

SV00262

spd

ackSent

31 30

Figure 19. Block Write or Lock Request Receive Format