IBM DBCA-204860 Hard Drive Specifications - Page 79
Standby timer, Status, Interface Capability for Power Modes, Initial Power Mode at Power
View all IBM DBCA-204860 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 79 highlights
5. Activate the spindle break to stop the spindle motor 6. Wait until spindle motor is stopped 7. Perform post process 10.4.4 Standby timer The standby timer provides a method for the device to automatically enter standby mode from either active or idle mode following a host programmed period of inactivity. If the device is in the active or idle mode, the device waits for the specified time period and if no command is received, the device automatically enters the standby mode. If the value of SECTOR C O U N T register on Idle command or Standby command is set to 00h, the device will automatically set the standby timer to 109 minutes. 10.4.5 Status In the active, idle and standby modes, the device shall have R D Y bit of the status register set. If BSY bit is not set, device shall be ready to accept any command. In sleep mode, the device's interface is not active. A host shall not attempt to read the device's status or issue commands to the device. 10.4.6 Interface Capability for Power Modes Each power mode affects the physical interface as defined in the following table: Mode Active Idle Standby Sleep BSY RDY Interface active x x Yes o 1 Yes o 1 Yes x x No Media Active Active Inactive Inactive Figure 49. Power conditions Ready(RDY) is not a power condition. A device may post ready at the interface even though the media may not be accessible. Though the interface is inactive in sleep mode, the access to the interface registers and the validity of I N T R Q is guaranteed for two seconds after Sleep command is completed. After this period, the contents of interface registers may be lost. Since the contents of interface registers may be invalid, host should NOT check Status register nor Alternate Status register prior to issuing soft reset to wake up a device. 10.4.7 Initial Power Mode at Power On After power on or hard reset the device goes to IDLE mode or STANDBY mode depending on the option. Refer to 6.6, " Drive Address Setting" on page 50 for the initial power mode selection. General Operation Descriptions 71