Datasheet

4–10

4.2.2.2 Block Read-Response and Write-Response Packets

The format for a block read-response packet is shown in Figure 4–15. The first quadlet read from the GRF

is the packet token described in section 3.3.4. It contains packet-reception status information added by the

TSB12LV01B. The first 16 bits of the second quadlet contains the destination node and bus ID. The second

quadlet also contains the response code of this transaction. The third quadlet is reserved. The first 16 bits

of the fourth quadlet contains the dataLength field. The remaining 16 bits represent the extended_tCode

field. The block data, if any, follows the extended_tCode. The format for a block write-response packet is

shown in Figure 4–16.

rCode reserved

destinationOffsetLow

block data (if any)

sourceID

dataLength extended_tCode

0 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

PacCom

spd WriteCount tCode ackSent

RESERVED

Reserved

destinationID tLabel rt tCode priority

Figure 4–15. Block-Receive Format (Read Response)