Table 3.5 Transfer Width Exponents; Table 3.6 Parallel Protocol Request - Hitachi Ultrastar 15K73 Reference Manual

Note : The agreement may become invalid after any condition which may leave
the data transfer agreement in a indeterminate state as follows :
·after a Hard Reset condition
·after a BUS DEVICE RESET message
·after a Power on Reset condition.
Note : If a synchronous data transfer agreement is in effect, the controller that
accepts a WIDE DATA TRANSFER REQUEST message resets the
synchronous agreement to asynchronous mode.
Parallel Protocol Request (010604XX00XXXXXX
Byte Bit
0 7-0
1 7-0
2 7-0
3 7-0
4 7-0
5 7-0
6 7-0
7
Byte7 bit6-0 of a PARALLEL PROTOCOL REQUEST is called Protocol Option
Bits.
3 SCSI BUS

Table 3.5 TRANSFER WIDTH EXPONENTS

Request Response Value
Value
00
H
01
H
02
H
03 -FF
H H

Table 3.6 PARALLEL PROTOCOL REQUEST

Value
01
H
06
H
04 PARALLEL PROTOCOL REQUEST code
H
mm Transfer period (mm
H
00
H
XX
H
XX
H
7 X
6 X
5 X RD_STRM(Read Streaming and Read Flow
4 X
3 X HOLD_MCS(Hold Margin Control Settings)
2 X
1 X
0 X
n = 00
H
n = 01
H
n = 01
H
n = 01
H
)
H
Description
Extended message
Extended message length
H
Reserved
REQ / ACK offset
Transfer Width Exponent
PCOMP_EN(Precompensation Enable)
RTI(Retain Training Information)
Control Enable)
WR_FLOW(Write Flow Control Enable)
QAS Request(0:Disable, 1:Enable)
DT Request(0:ST mode, 1:DT mode)
IU Request(0:Disable, 1:Enable)
OEM MANUAL:K6602924
Bus Width
8 Bits
16 Bits
16 Bits
16 Bits
times 4 nanoseconds)
Revision: 1 / Date: 2003.03.06
Page: 45 / 273