IBM DTNA-22160 Hard Drive Specifications - Page 151
Standby, E2h/96h
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12.30 Standby (E2h/96h) Command Block Output Registers Register 76543210 Data Feature Sector Count V V V V V V V V Sector Number Cylinder Low Cylinder High Device/Head 1 1D Command 11100010 Command Block Input Registers Register 76543210 Data Error ...See Below... Sector Count Sector Number Cylinder Low Cylinder High Device/Head Status ...See Below... Error Register 76543210 BBK UNC 0 IDN 0 ABT T0N AMN 00000V00 Status Register 76543210 BSY RDY DF DSC DRQ COR IDX ERR 0V0V 0 V Figure 91. Standby Command (E2h/96h) The Standby command causes the device to enter the Standby Mode immediately, and set auto power down timeout parameter(standby timer). When this command is issued, the device confirms the completion of the cached write commands before asserts INTRQ. Then the device is spun down, but the interface remains active. If the device is already spun down, the spin down sequence is not executed. During the Standby mode the device will respond to commands, but there is a delay while waiting for the spindle to reach operating speed. The timer starts counting down when the device returns to Idle mode. Output Parameters To The Device Sector Count Timeout Parameter. If zero, the timeout interval(Standby Timer) is N O T disabled, but the timeout interval is set for 109 minutes automatically. If other than zero, the timeout interval is set for (Timeout Parameter × 5) seconds. When the automatic power down sequence is enabled, The device will enter Standby mode automatically if the timeout interval expires with no device access from the host. The timeout interval will be reinitialized if there is a device access before the timeout interval expires. Command Descriptions 143