Fujitsu M2266S Technical Handbook page 59

M2266S/H
Technical Handbook
Synchronous mode data transfer request
Set whether synchronous mode data transfer request is used according to
Table 3.5. The user can set the allowable scope of the maximum transfer rate
in synchronous mode according to Table 3.5.
Table 3.5 Synchronous Mode Data Transfer Request Setting (CNH2)
Synchronous mode transfer request 15-16
Enabled Short
Disabled Open
* 1 Set at factory shipment
Table 3.6 Scope of Transfer Rate in Synchronous Mode Setting (CNH2)
3 to 4.8 MB/s synchronous mode transfer 13-14
Enabled (max. 4.80 MB/s) Short
Disabled (max. 2.67 MB/s) Open
*1 Set at factory shipment
Notes:
1. This setting does not affect asynchronous mode transfer.
2. When synchronous mode transfer request is disabled, the IDD
operates as follows.
• When the SYNCHRONOUS DATA TRANSFER REQUEST
message is sent from the INIT, the IDD replys to that message and
the DATA IN and the DATA OUT phases of the SCSI bus can be
executed in synchronous mode.
• The IDD does not send the SYNCHRONOUS DATA TRANSFER
REQUEST message to the INIT.
3. The maximum data transfer rate in synchronous mode is determined
when the SYNCHRONOUS DATA TRANSFER REQUEST message is
exchanged between the IDD and INIT.
3-12 P5810125-01 . . . A
Fujitsu America, Inc.