Hitachi HTS541010G9AT00 Specifications - Page 63
General operation descriptions
UPC - 000061425019
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10.0 General operation descriptions 10.1 Reset response ATA has the following three types of resets: Power On Reset (POR) COMRESET Soft Reset (Software Reset) The device executes a series of electrical circuitry diagnostics, spins up the head disk assembly, tests speed and other mechanical parametric, and sets default values. COMRESET- signal is negated in Serial ATA Bus. The device resets the interface circutitry as well as Soft Reset. The SRST bit in the Device Control Register is set and then is reset. The device resets the interface circuitry according to the Set Features requirement. The actions of each reset are shown in the table below. Table 29: Reset response table Aborting Host interface Aborting Device operation Initialization of hardware Internal diagnostic Spinning spindle Initialization of registers (*2) Reverting programmed parameters to default Number of CHS (set by Initialize Device Parameters) Multiple mode Write Cache Read look-ahead ECC bytes Disable Standby timer Power mode POR O O O O O Comreset O (*1) X X X O (*6) soft reset O (*1) X X X O (*3) 0 (*5) x (*4) x (*4) O - execute X - does not execute Notes: (*1) (*2) (*3) (*4) (*5) (*6) Execute after the data in write cache has been written. The default value on POR is shown in Table 30: "Default Register Values" on page 52. The Set Features command with Feature register = CCh enables the device to revert these parameters to the power on defaults. In the case of Sleep mode, the device goes to Standby mode. In other cases, the device does not change current mode. Idle when Power-Up in Standby feature set is disabled. Standby when Power-Up in Standby feature set is enabled. See section Software Setting Preservation feature. Travelstar 5K100 (Serial ATA) Hard Disk Drive Specification 51