User manual MAXTOR ST31621A

[. . . ] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ST31081A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ST31621A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ATA Interface Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ST31081A/ST31621A Intelligent Disk Drive Product Manual Production Release per ECO SJD7262 P/N 20401030-001 Revision A May 1996 920 Disc Drive Scotts Valley, California 95066 FCC Notice This equipment generates and uses radio frequency energy and, if not installed and used properly; that is, in strict accordance with the manufacturer's instructions, may cause interference to radio and television reception. It has been type tested and found to comply with the limits for a Class B computing device in accordance with the specifications in Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference in a residential installation. [. . . ] If they are invalid, no error will be reported until an illegal access is made by some other command. Cylinder head increments on subsequent commands will occur after access of the maximum sector and maximum head specified by this command. Upon receipt of the command, the drive sets BSY, saves the parameters, resets BSY, and generates an interrupt. Seagate has established a Universal Translate Mode which enables the you to configure the drive in an AT environment to any cylinder, head, and sector configuration desired (refer to chapter 3). Technical Reference Manual Page 55 Chapter 7 Command Set Power Commands Command Number: Ex hex Description: The Power commands are supported on some Seagate drives, including the ST32161A. If a Power command is issued to a drive that does not support the Power commands, an Abort status will be returned to the host in the Error register. The following table describes these commands: Error Code: E0H E1H E2H Description: The drive enters Standby Mode immediately The drive enters Idle Mode immediately The drive enters Standby Mode immediately. If the Sector Count register is non-zero, then the Auto Power-Down feature is enabled and will take effect when the drive returns to Idle Mode. If the Sector Count register is zero, then the Auto Power-Down feature is disabled. E3H The drive enters Idle Mode immediately. If the Sector Count register is non-zero, then the Auto Power-Down feature is enabled and will take effect immediately. If the Sector Count register is zero, then the Auto Power-Down feature is disabled. E5H Puts FF hex in the Sector Count register if the drive is in Idle Mode. Puts 00 hex in the Sector Count register if the drive is in, going to, or recovering from the Standby Mode. Puts BB hex in the Sector Count register if power lock is enabled. E6H The drive enters Sleep Mode. A reset is required to bring the drive out of Sleep Mode. Note: Minimum power off/on cycle time is 60 seconds. Page 56 ST31081A/ST31621A Command Set Chapter 7 All of the Power commands except command E6 will execute immediately and return the ending interrupt after the spin up/down sequence is initiated. Please note that if the drive is already spinning (Idle Mode) and a spin-up command is issued from the host, the spin-up sequence is not initiated. Similarly, if the drive is in Standby Mode and the host issues a spin-down command, the spin-down sequence is not initiated. Return of the ending interrupt does not mean that the drive has fully transitioned to the desired operating mode. In command E6, the drive is spun down and when it is stopped, the drive returns the ending interrupt and the Sleep Mode begins. When enabling the Auto Power-Down feature, the value in the Sector Count register specifies the number of 5-second increments for the time-out value. If the drive does not receive a command within the specified time, the drive will enter Standby Mode. The drive does not support the ATA extended timer periods (0xF1 hex through 0xFF hex). The minimum time-out value is 60 seconds, which means the smallest value for the Sector Count register is 12 (0x0C hex) when enabling the Auto Power-down feature. If a number between 1 and 11 inclusive is specified in the Sector Count register, a value of 12 is used. [. . . ] Cylinder, logical - A mapping of sectors on the disk drive into an imaginary cylinder for purposes of achieving compatibility with legacy addressing schemes. . Traditionally, a device on the ATA interface has been a hard disk drive, but any form of storage device may be placed on the ATA interface provided it adheres to this standard. Device selection - A device is selected when the DEV bit of the Drive/Head register is equal to the device number assigned to the device by means of a Device 0/Device 1 jumper or switch, or use of the CSEL signal. DMA (Direct memory access) - A means of data transfer between device and host memory without host processor intervention. [. . . ]