Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
217
drive interprets the Initiator corresponding transfer width exponent as shown in the following table.
Table 175: Target request to Initiator
Note:
If the corresponding transfer width exponent received from the Initiator indicates a data transfer width that is greater
than 16 bits (E > 01h), the Target sends a Message Reject message to the Initiator to indicate 8-bit data transfer mode.
If the first message received from the Initiator is either a Message Parity Error or a Message Reject message, the Target goes to
8-bit data transfer mode. In the case of a Message Parity Error, the wide data transfer negotiation is restarted if the Target suc-
cessfully retransmits the Wide Data Transfer Request message to the Initiator.
If the first message received from the Initiator is any other message, the Target goes to 8-bit data transfer mode. The Target
assumes that the Initiator does not support wide data transfer and does not attempt to renegotiate with this Initiator.
The Target does not consider the implied agreement for wide data transfer operation to exist until the Target leaves the Mes-
sage Out phase, implying that no parity error was detected. If the Target detects a parity error while attempting to receive the
message from the Initiator, the Target goes to 8-bit data transfer mode. The Target will attempt to resume the wide data transfer
negotiation by retrying the Message Out phase.
Note:
If during the Message In phase of negotiations, either Target or Initiator started, ATN is asserted prior to transmission
of the last byte of the message and the message is not Message Parity or Message Reject, the Target goes to 8-bit data transfer
mode.
19.1.4 Parallel Protocol Request (01, 06, 04h)
Parallel Protocol Request messages are used to negotiate a synchronous data transfer agreement and a wide data transfer agree-
ment and to set the protocol options between two SCSI devices.
Table 176: Parallel Protocol Request
PARALLEL PROTOCOL REQUEST messages are used to negotiate a synchronous data transfer agreement and a wide data
Initiator request
Target Data Transfer Width
Ei = 00h
8 bit data transfers
Ei = 01h
16 bit data transfers
Ei > 01h
Send Message Reject (8 bit data transfer)
Byte
Bit
7
6
5
4
3
2
1
0
0
Extended Message = 01h
1
Extended Message Length = 06h
2
Parallel Protocol Request = 04h
3
Transfer Period Factor
4
Reserved = 00h
5
REQ/ACK Offset
6
Transfer Width Exponent
7
PCOMP_EN RTI
RD_STRM
WR_FLOW HOLD_MCS QAS_REQ
DT_REQ
IU_REQ
Содержание HUS151414VL3600
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