Reset - Toshiba MK3006GAL Specification

360050398

10.12 Reset

A RESET condition sets the drive ( or both drives in case of Drive0/Drive1 connection ) BSY, allowing the
drive to perform the specified initialization required for normal operation.
A RESET condition can be generated by both hardware and software. There are two hardware resets,
one is by the Host (- RESET) and the other is by the drive power sense circuitry. These resets are set high
when the system and the drive respectively acknowledge specified supply voltage ( See 6.1).
The other reset is software generated. The Host can write to the Device Control register and set the
reset bit. The host software condition will continue until the reset bit is set to zero.
Once the reset is negated and the drive is re-enabled, with BSY still active, the drive will perform
necessary hardware initialization, clear any previously programmed drive parameters and revert
to the defaults, load the Task File registers with their initial values, and then clear BSY. No interrupt
is generated when initialization is complete. The initial values ( hex ) for the Task File registers are
as follows.
REGISTER
Data
Error
Sector Count
Sector Number
Cylinder Low
Cylinder High
Device/Head Register
Status/Alternate Status
9
Device address
ECC Length
Data Buffer
Addressing mode
Auto stand-by mode
Read Cache
10
Write Cache
Multiple mode
DMA transfer mode
PIO transfer mode
(*1): Software reset settings are affected by set feature command.
9
ATA-2 Notes: This register is obsolete. It is recommended that a device not respond to a read of this address. If a
device does respond, it shall be sure not to drive the DD7 signal to prevent possible conflict with floppy disk
implementations.
The drive supports this register to maintain compatibility for ATA-1.
10
ATA-2 Notes: The default mode for write cache is "disable" after ATA-2. This is violation of ATA-2 specification. This setting can be
changed by factory.
.
Table 10.12-1 Initialization of Task File registers
POWER ON
00
01
01
01
00
00
00
50 or 52
7E or FE
4 bytes
undefined
default
disable
enable
enable
16 sectors
Multiword
DMA mode 2
PIO mode 4
flow control
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HARDWARE RESET
00
01
01
01
00
00
00
50 or 52
7E or FE
4 bytes
undefined
default
disable
enable
enable
16 sectors
Multiword DMA mode
2
PIO mode 4 flow
control
SOFTWARE RESET
00
01
01
01
00
00
00
50 or 52
7E or FE
no change(*1)
no change
no change
no change
no change (*1)
no change (*1)
no change (*1)
no change(*1)
no change(*1)