Write Full
The
WRITE
FULL command allows
the
Initiator
to
request
the
Target
to
write
the
specified
logical or physical block with
the
exact block formatting information included with the
command. This information may include
the
header,
data,
and
ECC
field contents.
Caution
I
Byte
00
01
02-05
06
07-08
09
Note
The
WRITE
FULL command allows
the
Initiator
to
directly control
the
formatting of a physical block
of
media. Use of
this
command should be
restricted
to
development
or
other
highly controlled environments.
The
use
of this command
may a.dversely affect
the
reliability
of
data
recovery
and
proper device operation
at
media addresses
other
than
the
one specified.
This command is intended strictly
to
test
Target and
Initiator
reaction
to
certain induced media errors. Any use of this command
other
than
at
Hewlett-Packard approved sites and by Hewlett-Packard approved methods
may be deemed
a violation of warranty.
Write
Ful!
Command
Descriptor
Block
(COB)
Bit
7
I
6
I
5
I
4
I
3
I
2
I
1
I
0
Opcode:::
FCH
Logical
Unit
Number
I
Reserved
1
Phys
(MSB:::02)
Address
(LSB:::05)
Reserved
(MSB:::07,
02H)
Byte
Transfer
Length
(LSB:::08,lAH)
Control
Byte
For this command
to
succeed,
the
header of
the
sector prior
to
the
requested
sector must be readable.
Using
the
WRITE
FULL command,
the
Initiator transfers
to
the
Target
the
compiete
information
to
write one physical block. A
WRITE
FULL command is usually preceded by
a READ
FULL command, which returns
the
entire contents (548 bytes) of a specified block.
The
Initiator
receives the complete READ FULL
data,
strips off
the
lO-byte header, and
modifies
the
block contents as required.
The
resultant 538 bytes
constitute
the
data
phase
of
the
WRITE
FULL command.
The
WRITE
FULL command and
the
preceding READ
FULL command should
both
address
the
same block; thus ensuring
that
the
modified
data
is
returned
to
its
original location.
6-22
Ven~or
Unique
Command
Descriptions
DRAFT
1/18/93 09:58
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