Fujitsu MAT3300FC User Manual
2.1 Command Format
C141-C008
2-5
b. Transfer byte length or parameter list length
When the transfer data length is specified as the “Transfer Byte Length” or
“Parameter List Length”, this field specifies the length of the data transferred
between the INIT and IDD by that command in number of bytes. When zero is
specified in this field, data transfer is not executed, except in cases where it is
particularly stipulated in the specifications for individual commands in Chapter 4.
“Parameter List Length”, this field specifies the length of the data transferred
between the INIT and IDD by that command in number of bytes. When zero is
specified in this field, data transfer is not executed, except in cases where it is
particularly stipulated in the specifications for individual commands in Chapter 4.
In commands which send the parameters which are necessary for command
execution are sent from the INIT to the IDD, this field is called “Parameter
List Length” and specifies the total number of bytes of the parameter list sent
by the INIT.
execution are sent from the INIT to the IDD, this field is called “Parameter
List Length” and specifies the total number of bytes of the parameter list sent
by the INIT.
On the other hand, with commands which receive information from the IDD
(REQUEST SENSE, INQUIRY, etc.), it is called “Transfer Byte Length” and
specifies the maximum number of bytes that can be received from the INIT
(the number of bytes in the area secured in the INIT for receiving
information). The IDD transfers either the number of effective bytes of
information specified by the command or the value specified in the “Transfer
Byte Length”, whichever value has the smaller number of bytes.
(REQUEST SENSE, INQUIRY, etc.), it is called “Transfer Byte Length” and
specifies the maximum number of bytes that can be received from the INIT
(the number of bytes in the area secured in the INIT for receiving
information). The IDD transfers either the number of effective bytes of
information specified by the command or the value specified in the “Transfer
Byte Length”, whichever value has the smaller number of bytes.
(5) Control byte
Table 2.5 Control byte
Bit
7
6 5 4 3 2 1 0
0 0 0 0 0 0 0 0
a. Bits 7, 6 (vendor unique)
The values specified in these bits have no meaning except in cases where it is
specified in individual commands, and the IDD disregards the specified values.
specified in individual commands, and the IDD disregards the specified values.
It is possible to use bit 7 and bit 6 of the control byte as an inherent
control field in future product specifications. It is recommended
that the INIT specify zero in this field.
control field in future product specifications. It is recommended
that the INIT specify zero in this field.
b. Bits 5, 4, 3
These should always be set on “0”.
c. Bit 2 (ACA)
This IDD does not support ACA, so this bit should be set on “0”.
d. Bit 1 (Flag)
This IDD does not support Flag, so this bit should be set on “0”.