Toshiba MK6017MAP - Manual (Page 50)

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10.7 Register Description
In the following register descriptions, unused write bit should be treated as “don't care”, and unused read bits
should be read as zeros.
10.7.1 Data Register
- CS0 DA2-DA0 : 0 Read / Write
There are seven commands which execute data transfer from/to this register of the sector buffer for Read
and Write operations. The sector table during Format command and the data associated with the Identify
Device command shall also be transferred to this register.
10.7.1.1 Read/Write command
The register provides a high speed 16 bit path into the sector buffer with PIO and DMA.
10.7.1.2 Read/Write Long command
When a Read/Write Long is issued, the ECC bytes are transferred by 8 bit operation.
10.7.1.3 Read/Write Buffer command
This command provides 16 bit path between host and data buffer in the drive.
10.7.1.4 Format command
This command provides a path for the parameter including interleave table in a sector length.
10.7.1.5 Identify Device command
Drive information is transferred during the execution of this command.