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 | Use P11 as an input pin |
• | Driving Ready 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 Disable
The disk drive spins up at power on. (Default setting)
b)P11 → Grounded (0.8 V or less): (The same behavior as a) )
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 at power on.
5.1.5.2 Driving Ready LED
It is possible that the disk drive is able to drive P11 pin as output for indication of Ready LED.
a)P11 output level → “Low”: Ready indication (LED is on)
b)P11 output level → “High”: Not Ready indication (LED is off)
It is necessary to meet the requirements for P11 as output pin in case of driving Ready LED.
Table 5.3 Requirements for P11 as an output pin.
| Asserted | Deasserted |
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|
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VACT | ≤ 0.7V | ≥ 0.7V |
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|
|
IACT | - | +50uA |
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|
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