Quantum ATL SuperLoader ATL, User Manual

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Chapter 2 Messages
Supported SCSI Messages
Quantum ATL SuperLoader Software Interface Guide 23
Table 8 Transfer
Rates
The minimum supported value for Transfer Period is 0Ah when
the bus is operating in LVD mode. When operating in HVD or
Single-Ended mode, the minimum Transfer Period value is 0Ch.
The SuperLoader SDLT 220 and SuperLoader SDLT 320 Transfer
REQ/ACK offset may be any value between 0 and 62. A value of 0
indicates asynchronous transfers. A request with a value greater
than 62 will cause the device to return a request for 62.
The SuperLoader DLT1 Transfer REQ/ACK offset may be any
value between 0 and 15. A value of 0 indicates asynchronous
transfers. A request with a value greater than 15 will cause the
device to return a request for 15.
The SuperLoader LTO only supports a Transfer REQA/ACK offset
of 0. This indicates asynchronous transfers.
Wide Data Transfer
Request Extended
Message (03h)
2
The following figure illustrates the message format.
Transfer
Period
Transfer Rate
0Ah 40 MHz, 25 nsec Transfer Period
0Bh 33 MHz, 30.3 nsec Transfer Period. LTO and SDLT uses 37.5 nsec period.
0Ch 20 MHz, 50 nsec Transfer Period
0Dh – 5Dh (4 * Transfer Period) nsecs.