C141-E123-01EN
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(5)
Data transfer rate in synchronous mode
Table 1.18 lists the synchronous transfer mode parameters valid for the IDD. 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 1.18
Parameters used for fast synchronous data transfer mode
Transfer rate
Parameter type
Selectable value
8-bit mode
16-bit mode
X’09’(12.5ns) (4)
Maximum 160.00 MB/s
X'0A' (25 ns) (3)
Maximum 80.00 MB/s
X'0B' (37.5 ns) (3)
Maximum 53.30 MB/s
X'0C' (50 ns) (2)
Maximum 40.00 MB/s
X'11' (75 ns) (2)
Maximum 26.66 MB/s
X'19' (100 ns) (1)
Maximum 20.00 MB/s
X'1F' (120 ns) (1)
Maximum 16.00 MB/s
X'25' (150 ns) (1)
Maximum 13.33 MB/s
X'2B' (175 ns) (1)
Maximum 11.42 MB/s
X'32' (200 ns)
Maximum 10.00 MB/s
X'38' (225 ns)
Maximum 8.88 MB/s
X'3E' (250 ns)
Maximum 8.00 MB/s
X'44' (275 ns)
Maximum 7.27 MB/s
X'4B' (300 ns)
Maximum 6.66 MB/s
X'51' (325 ns)
Maximum 6.15 MB/s
X'57' (350 ns)
Maximum 5.71 MB/s
PPR
Transfer Period
(5)
X'5D' (375 ns)
N/A
Maximum 5.33 MB/s
X'0A' (25 ns) (3)
Maximum 40.00 MB/s
Maximum 80.00 MB/s
X'0B' (37.5 ns) (3)
Maximum 26.60 MB/s
Maximum 53.30 MB/s
X'0C' (50 ns) (2)
Maximum 20.00 MB/s
Maximum 40.00 MB/s
X'11' (75 ns) (2)
Maximum 13.33 MB/s
Maximum 26.66 MB/s
X'19' (100 ns) (1)
Maximum 10.00 MB/s
Maximum 20.00 MB/s
X'1F' (120 ns) (1)
Maximum 8.00 MB/s
Maximum 16.00 MB/s
X'25' (150 ns) (1)
Maximum 6.67 MB/s
Maximum 13.33 MB/s
X'2B' (175 ns) (1)
Maximum 5.71 MB/s
Maximum 11.42 MB/s
SDTR
Transfer Period
(6)
X'32' (200 ns)
Maximum 5.00 MB/s
Maximum 10.00 MB/s
(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)
(4) Ultra-160M fast synchronous data transfer mode only for LVD (Fast-80 SCSI). This code is
only valid if the PROTOCOL OPTIONS field has a value selected that supports double-
transition data transfers.
(5) PPR : PARALLEL PROTOCOL REQUEST
(6) SDTR : SYNCHRONOUS DATA TRANSFER REQUEST
Summary of Contents for MAN3184 SERIES
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