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Parameter Data Formats
4 - 12 C141-E167
Note:
If the value specified for the "buffer full ratio" or the "buffer empty ratio" is not within
double the integral boundary of the logical data block length, the IDD rounds up the
specified value to the value which is the nearest data block boundary. Also, if zero is
specified in any of these parameters. If X’00’is specified, the IDD assigns an appropriate
value for this parameter that is determined by IDD. However, parameter values specified
from the INIT in the MODE SELECT or MODE SELECT EXTENDED command are held
as is and those values are reported in response to a MODE SENSE or MODE SENSE
EXTENDED command. (Rounding processing of the parameters is not done by the IDD.)
c. Bus inactivity limit
This parameter indicates the maximum time that the TARG is permitted to keep the SCSI bus in
the busy state (BSY signal = TRUE) without executing a REQ/ACK handshake, in multiples of
100 µs. In the IDD, this value is 100 µs during normal operation. It is impossible for this
parameter to be changed by the INIT. The IDD disregards the value specified in this parameter
and operates according to the "Default" value.
d. Disconnect time limit
This parameter specifies the maximum time that the TARG is permitted to continue in the
disconnect state until it starts reconnect processing, in multiples of 100 µs.
In the IDD, this value is 0 µs. It is impossible for this parameter to be changed by the INIT. The
IDD disregards the value specified in this parameter and operates according to the "Default"
value.
e Connect time limit
This parameter specifies the maximum time that the TARG is permitted to use the SCSI bus until
it starts disconnect processing, in multiples of 100 µs.
In the IDD, this value is unlimited. It is impossible for this parameter to be changed by the INIT.
The IDD disregards the value specified in this parameter and operates according to the "Default"
value.
f. Maximum burst size
This parameter specifies the maximum volume of data the TARG is permitted to transfer
continuously in the DATA IN phase or the DATA OUT phase until it starts disconnect
processing, in multiples of number of bytes per sector.
In the IDD, this value is unlimited. It is impossible for this parameter to be changed by the INIT.
The IDD disregards the value specified in this parameter and operates according to the "Default"
value.
g. Data transfer disconnect control (DTDC)
DTDC: Controls how to perform disconnection.