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C156-E142-02EN 4 - 33
4.5.10 SET FEATURES (X'EF')
Table 4.32 SET FEATURES command
Bit
76543210
CM11101111
DHXXXDRVXXXX
CHXXXXXXXX
CLXXXXXXXX
SNXXXXXXXX
SC Setting value
FR Setting value
The SET FEATURES command changes the ODD operating mode to the mode set in the SC and
FR registers. If the specified value is not supported by the ODD or an invalid value, the ODD
reports Aborted Command.
Table 4.33 FR register setting value
Setting
value
Function Default
value
02 Enables the write cache. *
03 Supports data transfer depending on the value of the SC register. See Table 4.16.
31 Disables the media status notification function. *
55 Disables the read ahead cache.
5D Enables the interrupt signal to release the bus after the overlap command is received.
5E Enables the reception of the DRQ interrupt signal by the SERVICE command.
66 Does not reset various setting values to the power-on default value by software reset.
(The media status notification function is reset normally.)
*
82 Disables the write cache.
95 Enables the media status notification function.
AA Enables the read ahead cache. *
CC Returns various setting values to the power-on default value by software reset.
DD Enables the interrupt signal to release the bus after an overlap command is received. *
DE Disables the DRQ interrupt signal by the SERVICE command. *