Sony LIB-D81 Product Description Manual page 54

WIDE DATA TRANSFER REQUEST
Perform negotiation of data width in data transfers.
Bit 7 6
Byte
0
1
2 WIDE DATA TRANSFER REQUEST(03h)
3
Table 7.2.1.6 : WIDE DATA TRANSFER Message Format
Responding SCSI device WDTR response
TRANSFER WIDTH EXPONENT = 1
TRANSFER WIDTH EXPONENT = 0
MESSAGE REJECT message (as a result of the
responding message )
Parity error (on responding message)
Unexpected bus free (as a result of the responding
message)
No response
Table 7.2.1.7 : WDTR message implied agreements
PARALLEL PROTOCOL REQUEST
Set the synchronous transfer, data width, and other data transfer options. The
autoloader does not return this message.
Bit 7 6
Byte
0
1
2 PARALLEL PROTOCOL REQUEST(04h)
3
4
5
6
7
Table 7.2.1.8 : PARALLEL PROTOCOL Message Format
5 4 3
Extended Message(01h)
Extended Message Length(02h)
TRANSFER WIDTH EXPONENT(m)
Implied agreement
16-bit data transfer
8-bit data transfer
8-bit data transfer
8-bit data transfer
8-bit data transfer
8-bit data transfer
5 4 3
Extended Message(01h)
Extended Message Length(06h)
TRANSFER PERIOD FACTOR
Reserved
REQ/ACK Offset
TRANSFER WIDTH EXPONENT(m)
Reserved QAS_REQ DT_REQ IU_REQ
2 1 0
2 1 0
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Chapter 7 SCSI Interface