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Flash ROM
64K 16 bits
ATA
Series Termination
I/F
– PIO Mode-4
– Multiword DMA Mode-2
– Ultra DMA Mode-4 (66.6MB/s)
– Ultra DMA Mode-5 (100MB/s)
4.4
Power-on Sequence
Figure 4.3 describes the operation sequence of the disk drive at power-on. The outline is
described below.
a) After the power is turned on, the disk drive executes the MPU bus test, internal register
read/write test, and work RAM read/write test.
successfully, the disk drive starts the spindle motor.
b) The disk drive executes self-diagnosis (data buffer read/write test) after enabling response to
the ATA bus.
c) After confirming that the spindle motor has reached rated speed, the disk drive releases the
heads from the actuator magnet lock mechanism by applying current to the VCM. This
unlocks the heads which are parked at the inner circumference of the disks.
d) The disk drive positions the heads onto the SA area and reads out the system information.
e) The disk drive executes self-seek-calibration.
mechanical external forces applied to the actuator, and updates the calibrating value.
f) The drive becomes ready. The host can issue commands.
Himalaya 2.0
CL-SH8671
MCU
ARM7TDMI
RDC
CL-SH3515
HDC
SH7661
Bandwidth = 160.0 MB/s
Buffer
Data Buffer
256K 16 bits
Option
(1024K 16 bits)
Figure 4.2
MPG3xxxAT Block diagram
C141-E110-02EN
Console I/F (RS232C)
40.0 MHz
Head IC
SR1756
HA13627
R/W
When the self-diagnosis terminates
This collects data for VCM torque and
SVC
SPM/VCM
control
4 - 5
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