5.1 Physical Interface
5.1.5 P11 function
The disk drive supports the following functions when P11 pin in the power supply
segment of interface connector is used as an input or output pin.
P11 pin supports the functions as follows:
• Staggered Spin-up: Use P11 as an input pin
• Driving Activity LED: Use P11 as an output pin
The following is P11 setting and hardware requirement for these functions.
5.1.5.1 Staggered Spin-up
It is able to set whether the disk drive spins up at power on or not, by input voltage
level of 11th pin at the power supply segment on the interface connector.
a) P11 → Open (no connection): Staggered Mode Enable.
The disk drive does not spin up until after
successful Phy initialization at power on.
(Default setting)
b) P11 → Grounded (0.8 V or less): Staggered Mode Disable.
The disk drive spins up at power on.
c) P11 → “High” level (The P11 line in the host system is pulled up by
resistor [recommended value: 1 to 5.1 kΩ] to power supply in the
host system [Recommended voltage: 2V (3.3V or less)]:
Staggered Mode Enable
The drive does not spin up until after
successful Phy initialization at power on.
5.1.5.2 Driving Activity LED
It is possible that the disk drive is able to drive P11 pin as output for indication of
Activity LED.
a) P11 output level → “Low”: It indicates that the command is in execution.
(LED is on)
b) P11 output level → “High”: It indicates that the command is not in
execution. (LED is off)
It is necessary to meet the requirements for P11 as output pin in case of driving
Activity LED.
Table 5.3 Requirements for P11 as an output pin.
Asserted Deasserted
V
ACT
≤ 0.7V ≥ 0.7V
I
ACT
- +50uA
C141-E254 5-11
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