Fujitsu MAX3073NC - SCSI,80, Dell DC961,Hard Drive Scsi Logical Interface Specifications page 224

Parameter Data Formats
a. Transfer Period Factor
This field indicates the transfer rate value for a transfer established by the current I_T NEXAS.
Note:
When an asynchronous transfer is established (REQ/ACK Offset is set to X'00'), the value reported
by this parameter is not in effect and has no meaning.
*1 The transfer cycle is calculated as (Period value * 4)(ns).
b. REQ/ACK Offset
This field indicates the REQ/ACK offset for a transfer established by the current I_T NEXAS.
Value
00h
01h - FEh
FFh
c. Transfer Width Exponent
This field indicates the data transfer width of a transfer established by the current I_T NEXAS.
4-40
Period value
08h
09h
0Ah
0Bh
0Ch
0Dh - 18h
19h - 31h
32h
Asynchronous transfer
Synchronous transfer or Paced transfer according to the offset as established
by Negotiation
Synchronous transfer or Paced transfer according to an unlimited offset
Value
00h
8-bit data bus
01h
16-bit data bus
02h Obsolete
03h - FFh Reserved
Parameter
160 MHz
80 MHz
40 MHz
30.3MHz
20 MHz
19.2 to 10.4MHz (*)
10.0 to 5.1MHz (*)
5 MHz
Parameter
Parameter
C141-C010