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4.4 SCSI Messages
C156-E224-01EN 4-45
Table 4.74 lists the values of Transfer Period and the corresponding synchronous
transfer rates.
Table 4.74 Transfer mode settings requested by INIT to ODD
Transfer Period requested
by INIT
Transfer Period
acknowledged by ODD
Transfer mode used
00h ~ 0Ch 0x0Ch
Synchronous transfer (20 MBps)
REQ period ≥ 50 ns
ACK period ≥ INIT-specified value
0Dh ~ 12h 0x12h
Synchronous transfer (13.3 MBps)
REQ period ≥ 75 ns
ACK period ≥ INIT-specified value
13h ~ 19h 0x19h
Synchronous transfer (10 MBps)
REQ period ≥ 100 ns
ACK period ≥ INIT-specified value
1Ah ~ 25h 0x25h
Synchronous transfer (6.6 MBps)
REQ period ≥ 150 ns
ACK period ≥ INIT-specified value
26h ~ 32h 0x32h
Synchronous transfer (5.0 MBps)
REQ period ≥ 200 ns
ACK period ≥ INIT-specified value
33h ~ 3Fh 0x3Fh
Synchronous transfer (4.0 MBps)
REQ period ≥ 250 ns
ACK period ≥ INIT-specified value
40h ~ 4Bh 0x4Bh
Synchronous transfer (3.3 MBps)
REQ period ≥ 300 ns
ACK period ≥ INIT-specified value
4Ch ~ 7Dh 0x7Dh
Synchronous transfer (2.0 MBps)
REQ period ≥ 500 ns
ACK period ≥ INIT-specified value
7Eh ~
INIT-specified value
REQ/ACK Offset = 0
Asynchronous transfer