Toshiba MK6017MAP manual Device/Head Register, DEV HS3 HS2 HS1 HS0

360014937

10.7.7.2 SMART commands

This register should be set to C2h for SMART commands

10.7.8 Device/Head Register

- CS0

DA2-DA0 : 6

Read / Write

The value of this register is used to select the drive, Master or Slave, and head. On multiple sector read/write operation that requires to cross track boundaries, the head select bit will be updated to reflect the currently selected head number.

1

L

1

DEV

HS3

HS2

HS1

HS0

Bit 7	Reserved (recommended to set 1)
Bit 6	L (Select LBA mode) L=0: CHS mode. L=1: LBA mode.
Bit 5	Reserved (recommended to set 1)
Bit 4	DEV (Device Select):
	- (Master/Slave mode) This bit is used to select the drive. DEV= 0 indicates the first fixed disk drive
	(Master), and DEV= 1 indicates the second (Slave).
	- (Single mode) should be 0. If this is 1, a drive is not selected but 00h shall be returned to status
	register.
Bit 3 -	HS3-HS0(Head Select Bits) -- Bits 3 through 0 determine the required read/write head. Bit 0 is the
Bit 0	least-significant bit. If the L bit is equal to one (LBA Mode), the HS3 through HS0 bits contain bits 27
	through 24 of the LBA.

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