Datasheet

Z5K500 OEM Specifications

11.1

11 Registers

In Serial ATA, the host adapter contains a set of registers that shadow the contents of the traditional

device registers, referred to as the Shadow Register Block. Shadow Register Block registers are

interface registers used for delivering commands to the device or posting status from the device. About

details, please refer to the Serial ATA Specification.

In the following cases, the host adapter sets the BSY bit in its shadow Status Register and transmits a

FIS to the device containing the new contents.

 Command register is written in the Shadow Register Block

 Device Control register is written in the Shadow Register Block with a change of state of the

SRST bit

 COMRESET is requested

This specification uses the same naming conventions for the Command Block Registers as the

ATA8-ACS standard. However, the register naming convention is different from that uses in the Serial

ATA 2.6 specification. The following table defines the corresponding of the register names used in this

specification with those used in the Serial ATA 2.6 specification.

Serial ATA register name

specification when writing

registers

specification when reading

registers

Features Feature current

Features (exp) Feature previous

Sector count Sector count current Sector count HOB=0

Sector count (exp) Sector count previous Sector count HOB=1

LBA low LBA low current LBA low HOB=0

LBA low (exp) LBA low previous LBA low HOB=1

LBA mid LBA mid current LBA mid HOB=0

LBA mid (exp) LBA mid previous LBA mid HOB=1

LBA high LBA high current LBA mid HOB=0

LBA high (exp) LBA high previous LBA mid HOB=1

Device Device Device

Command Command N/A

Control Device Control N/A

Status N/A Status

Error N/A Error

Table 24 Register naming convention and correspondence