Table 1.20 Parameters Used For Fast Synchronous Data Transfer Mode - Fujitsu MBA3073 SERIES Technical Manual

(5) Data transfer rate in synchronous mode
Table 1.20 lists the synchronous transfer mode parameters valid for the HDD. The actual values
are determined by exchange of SYNCHRONOUS DATA TRANSFER REQUEST or
PARALLEL PROTOCOL REQUEST message between the two SCSI devices. If two or more
INITs are used, different parameters may be used by each INIT. The PARALLEL PROTOCOL
REQUEST message are used to negotiate a synchronous data transfer agreement, a wide data
transfer agreement, and set the protocol options between two SCSI devices. Although the data
transfer rate is determined by the Transfer Period parameter, an appropriate REQ/ACK Offset
parameter value must be selected depending on the ACK pulse response of the INIT. The
interface cable length must also be considered.
Table 1.20
Parameter type
PPR
Transfer Period
(6)
SDTR
Transfer Period
(7)
(1) Fast synchronous data transfer mode (Fast SCSI)
(2) Ultra fast synchronous data transfer mode (Fast-20 SCSI)
(3) Ultra-2 fast synchronous data transfer mode only for LVD (Fast-40 SCSI)
1-27
Parameters used for fast synchronous data transfer mode
Selectable value
X'08' (6.25ns) (5)
X'09' (12.5ns) (4)
X'0A' (25 ns) (3)
X'0B' (37.5 ns) (3)
X'0C' (50 ns) (2)
X'11' (75 ns) (2)
X'19' (100 ns) (1)
X'1F' (120 ns) (1)
X'25' (150 ns) (1)
X'2B' (175 ns) (1)
X'32' (200 ns)
X'38' (225 ns)
X'3E' (250 ns)
X'44' (275 ns)
X'4B' (300 ns)
X'51' (325 ns)
X'57' (350 ns)
X'5D' (375 ns)
X'0A' (25 ns) (3) Maximum 40.00 MB/s
X'0B' (37.5 ns) (3) Maximum 26.60 MB/s
X'0C' (50 ns) (2) Maximum 20.00 MB/s
X'11' (75 ns) (2) Maximum 13.33 MB/s
X'19' (100 ns) (1) Maximum 10.00 MB/s
X'1F' (120 ns) (1) Maximum 8.00 MB/s
X'25' (150 ns) (1) Maximum 6.67 MB/s
X'2B' (175 ns) (1) Maximum 5.71 MB/s
X'32' (200 ns) Maximum 5.00 MB/s
Transfer rate
8-bit mode 16-bit mode
Maximum 320.00 MB/s
Maximum 160.00 MB/s
Maximum 80.00 MB/s
Maximum 53.30 MB/s
Maximum 40.00 MB/s
Maximum 26.66 MB/s
Maximum 20.00 MB/s
Maximum 16.00 MB/s
N/A Maximum 13.33 MB/s
Maximum 11.42 MB/s
Maximum 10.00 MB/s
Maximum 8.88 MB/s
Maximum 8.00 MB/s
Maximum 7.27 MB/s
Maximum 6.66 MB/s
Maximum 6.15 MB/s
Maximum 5.71 MB/s
Maximum 5.33 MB/s
Maximum 80.00 MB/s
Maximum 53.30 MB/s
Maximum 40.00 MB/s
Maximum 26.66 MB/s
Maximum 20.00 MB/s
Maximum 16.00 MB/s
Maximum 13.33 MB/s
Maximum 11.42 MB/s
Maximum 10.00 MB/s
C141-C007