6.3.2 I/O Register - Address
The communication to or from drive is through the SATA interface. To the host system the SATA drive
emulates a parallel ATA drive. As such, the following registers are not accessed directly host to drive. The
registers are set through the Serial Interface.
The Control Block registers are used for drive control and to post-alternate status. I/O port function and its
selection address are tabulated.
I/O
registers
6.3.3 Control Block Register Descriptions
6.3.3.1 Alternate Status Register (ex. 3F6h)
This register contains the same information as the Status register in the Command Block register. The only
difference is that reading this register does not imply interrupt acknowledgment nor does it clear a pending
interrupt.
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