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8 Lyrion Series IDE Product Manual, Rev. F
2.7.2 Conducted noise
Input noise ripple is measured at the host system power supply across an equivalent 15-ohm resistive load on
the +3.3 volt line.
Using 3.3-volt power, the drive is expected to operate with a maximum of 70 mV
peak-to-peak square-wave
injected noise at up to 20 MHz.
Note. Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write
current.
2.7.3 Voltage tolerance
Voltage tolerance (including noise):
3.3V ± 5%
2.7.4 Power-management modes
The drive provides programmable power management to provide greater energy efficiency. The drive features
the following power-management modes:
• Active mode
The drive is in Active mode during the read/write and seek operations.
• Performance idle mode
The drive enters this mode once the read/write/seek activity is completed. The buffer remains enabled, and
the drive accepts all commands and returns to Active mode any time disc access is necessary.
• Low power idle mode
Drive enters Low Power Idle mode from Performance Idle mode when the Advanced Power Management
Level is set between 80h and FDh, and the Idle timer reaches 2 seconds (default setting). Disc is spinning
and heads are parked and drive accepts all commands and returns to Active mode any time disc access is
necessary.
• Standby/Sleep mode
The drive enters Standby mode when the host sends a Standby Immediate command. When the Advanced
Power Management Level is set lower than 80h (default setting), the drive enters the Standby state after 2
seconds of interface inactivity. If the host has set the standby timer, the drive may also enter the Standby
mode after the expiry of the standby timer. The standby timer can be set using the Standby or Idle command.
In Standby mode, the drive buffer is disabled, the heads are parked and the spindle is at rest. The drive accepts
all commands and returns to Active mode any time disc access is necessary.
Table 3: Power-management modes
Power modes Heads Spindle Buffer
Active (read/write/seek) Tracking Rotating Enabled
Idle, performance Tracking Rotating Enabled
Idle, low power Parked Rotating Disabled
Standby/Sleep Parked Stopped Disabled