SHADOW REGISTER BLOCK
6.2Physical Interface
For information please consult the document entitled “Serial ATA: High Speed Serialized AT Attachment Revision 3.1” released on July 18, 2011 available from the Internet http://www.serialata.org/. Section 6 of the document contains physical layer specifications related topics.
6.3Signal Summary
For details, please consult the document entitled “Serial ATA: High Speed Serialized AT Attachment Revision 3.1” released on July 18, 2011 available from http://www.serialata.org/
6.3.1Signal Descriptions
For data packets and additional information please consult the document entitled “Serial ATA: High Speed Serialized AT Attachment Revision 3.1” released on July 18, 2011 available from http://www.serialata.org/.
A device can operate in either of two addressing modes, CHS or LBA, on a
This CHS term defines the addressing mode of the device as being by physical sector address. The physical sector address is made up of three fields: the sector number, the head number and the cylinder number. Sectors are numbered from 1 to a device specific maximum value, which cannot exceed 255. Heads are numbered from 0 to a device specific maximum value, which cannot exceed 15. Cylinders are numbered from 0 to a device specific maximum value, which cannot exceed 65,535. Typically, sequential access to the media is accomplished by treating the sector number as the least significant portion, the head number as the mid portion, and the cylinder number as the most significant portion of the CHS address.
In LBA mode the sectors on the device are assumed to be linearly mapped with an initial definition of: LBA
0 = (Cylinder 0, head 0, and sector 1). Irrespective of translate mode geometry set by the host, the LBA address of a given sector does not change:
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