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Figure 2.5
FCP Exchange
FCP EXCHANGE
CMDSEQ
DataReqSEQ
DataSEQ
ResponseSEQ
FRAME 1
FRAME 1
FRAME 1
FRAME 1
FRAME 2
FRAMEn
Figure 2.6
shows how the Exchange flows between the Initiator and
Target. The Initiator starts the FCP exchange by sending a Command
Sequence containing one frame to the Target. The Frame's payload
contains the Command Descriptor Block (CDB). The Target will then
respond with a Data Delivery Request Sequence containing one Frame.
The payload of this Frame contains a XFER_RDY response. Once the
Initiator receives the Target's response, it will begin sending the Data
Sequence(s), which may contain one or more Frames. This is analogous
to parallel SCSI's DATA_OUT phase. When the Target has received the
last Frame of the Data Sequence(s), it will send a Response Sequence
containing one Frame to the Initiator, thus concluding the FCP Exchange.
2-6
Fibre Channel Overview
Copyright © 2000, 2001 by LSI Logic Corporation. All rights reserved.
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