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Set Features
Subcommand Code
Feature Value
03h
66h
CCh
Set transfer mode
A host selects the transfer mechanism by Set Transfer Mode, subcommand code 03h, and specifying a
value in the Sector Count register. The upper 5 bits define the type of transfer and the low order 3 bits
encode the mode value. One PIO mode and one DMA mode shall be selected at all times. Therefore, if
a Multiword DMA mode is selected then no UDMA mode is selected and if a UDMA mode is selected, no
Multiword DMA mode is selected. The host may change the selected modes by the SET FEATURES
command.
Sector Count
00h
01h
08h
09h
0Ah
0Bh
0Ch
20h
21h
22h
40h
41h
42h
43h
44h
45h
Note: Issuing the set features transfer mode command only selects the speed for the particular type of
transfer. It does not select the transfer operation. The use of DMA for packet commands is selected
with the Packet command. See Packet Command (A0h) section 6.1.
Enable/disable reverting to defaults
Subcommand codes CCh and 66h are implemented for compliance with the ATAPI-6 standard. These
commands do not affect the operation of the SDX-470V, and should never return error.
If the SDX-470V ATAPI Tape Drive receives a SET FEATURES command with a Set Transfer Mode parameter
and a Sector Count register value of "00000000b", it sets its default PIO mode. If the value is "00000001b", the
Sony ATAPI Drive sets its default PIO mode and disable IORDY. The SDX-470V supports all PIO modes below
the highest mode supported.
SONY AIT-1 Turbo drive SDX-470V series Ver.1.0
Table 6-4: SET FEATURES Register Definitions
Set Feature Command
Set transfer mode based on value in Sector Count register.
Disable reverting to power on defaults
Enable reverting to power on defaults
Table 6-5: SET FEATURES Transfer Mode
Transfer Mode
PIO default mode
PIO default mode, disable IORDY
PIO transfer mode 0
PIO transfer mode 1
PIO transfer mode 2
PIO transfer mode 3
PIO transfer mode 4
Multiword DMA mode 0
Multiword DMA mode 1
Multiword DMA mode 2
Ultra DMA mode 0
Ultra DMA mode 1
Ultra DMA mode 2
Ultra DMA mode 3
Ultra DMA mode 4
Ultra DMA mode 5
6. ATA Command Specification
Transfer Speed
3.333 MByte/s
5.221 Mbyte/s
8.333 MByte/s
11.111 MByte/s
16.667 MByte/s
4.167 MByte/s
13.333 MByte/s
16.667 MByte/s
16.667 MByte/s
25.000 MByte/s
33.333 MByte/s
44.444 MByte/s
66.667 MByte/s
100.000 MByte/s
6-25
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