User manual MAXTOR CFS270A REV A 05-1995

[. . . ] CFS270A Intelligent Disk Drive Product Manual Production Release Per ECO 6379 P/N 20401000-001 Revision A May 1995 3081 Zanker Road San Jose, CA 95134-2128 (408) 456-4500 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. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment on and off, you are encouraged to try to correct the interference by one or more of the following measures: · · · Reorient the receiving antenna. [. . . ] e means the registers contain valid parameters when performing extended commands. x = don't care. · Technical Reference Manual Page 43 Chapter 6 Register Addresses and Functions Page 44 Filepro CFS270A Command Set 7 Command Register All commands are decoded from the Command Register. The drive's host interface must be programmed by the host computer to perform commands and will return status to the host at command completion. To issue a command, the host must: · · · load the pertinent registers in the Task File activate the interrupt enable bit, -IEN, in the Digital Output register write the command code to the Command register Execution begins as soon as the Command register is written. The following sections describe the drive's supported command set. For ease of reference, the commands are listed in alphabetical order. Technical Reference Manual Page 45 Chapter 7 Command Set Conner Specific Command Number: 9A hex Description: The Conner drive provides vendor-unique commands to allow for certain operations not provided by the standard command set. The Sector Number register must be set to 9A hex and the specific command in the Sector Count register. The Cylinder High and Low registers are used to pass any bytes used in a write operation. The Conner specific command has the following decodes: Decode: 00 hex 01 hex 02 hex 03 hex 04 hex 05 hex 06 hex 07 hex 08 hex * 09 hex * 0A-FF hex Description: Get Feature Word Reserved Read drive switches Abort command Reserved Reserved Abort command Abort command Power lock Power unlock Reserved * only valid on drives which implement Conner Power commands The following sections describe these decodes in more detail. Page 46 Filepro CFS270A Command Set Chapter 7 Get Drive Feature word (00) This command fetches the drive feature word and returns it in the Cylinder High and Cylinder Low registers. The bit meaning is as follows: Bit: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Description: Reserved Reserved Customer Reserved Reserved Reserved Reserved Reserved ATA/CAM mode = 1 Reserved Reserved Reserved (enable no spin on POR) Reserved Disable Read Look Ahead Caching Enable Write Caching Customer Reserved Customer Reserved It is important to read the Feature word and then only change the bits of interest leaving the other bits unaffected using specific commands supported by this drive. Technical Reference Manual Page 47 Chapter 7 Command Set Read the Drive Switches (02) This command returns the drive switches in the Cylinder Low Register. The bit meaning is as follows: Bit: 7 6 5 4 3 2 1 0 Description: Reserved Reserved -C/D Reserved Reserved Reserved Reserved Reserved Power Lock (08) This command prevents the drive from spinning down, and spins the drive up if the drive had been spun down. Power Unlock (09) This allows the drive to respond to the Power command and re-enables the power down time if applicable. Page 48 Filepro CFS270A Command Set Chapter 7 Execute Device Diagnostic Command Number: 90 hex Description: This command performs the internal diagnostic tests implemented by the drive. If the drive is a master, the drive performs the diagnostic tests and saves the results. It then checks to see if a slave drive is present and waits up to 5 seconds for the slave to complete its diagnostics. If the slave successfully completes its diagnostics, it asserts -HOST PDIAG. If unsuccessful, the master drive resets BSY in the Status register and generates an interrupt. The Error bit (ERR) is set in the Status register and the Error register is updated. The value in the Error register should be viewed as a unique 8-bit code and not as the single-bit flags defined previously. The interface registers are set to initial values except for the Error register. The table below details the codes in the Error register and a corresponding explanation: Error Code: 01 hex 02 hex 03 hex 8x hex Description: No error detected Format device error Sector buffer error Slave drive failed Additional codes may be implemented at the manufacturer's option. Note: If the slave drive fails diagnostics, the master drive shall "OR" 80 hex with its own status and load that code into the Error register. If the slave drive passes diagnostics or there is no slave drive connected, the master drive shall set bit 7 of the Error register in the Task File to 0. Technical Reference Manual Page 49 Chapter 7 Command Set Format Track Command Number: 50 hex Description: This command provides a means by which a defective sector may either be marked bad or reassigned. This command has been used on other drives to do the low level formatting job of putting the header and creating the data fields for all tracks on the drive. It is not necessary to execute a Format command prior to operating the drive on the host PC because the drive is a hard-sectored drive and all required low-level formatting is done when built. [. . . ] If an error occurs during a multiple sector write, it will terminate at the sector where the error occurs. The Task File indicates the location of the sector where the error occurred. The host may then read the Task File to determine what error has occurred, and on which sector. Technical Reference Manual Page 67 Chapter 7 Command Set A Write Long may be executed by setting the long bit in the command code. The Write Long command writes the data and the ECC bytes directly from the sector buffer; the drive will not generate the ECC bytes itself for the Write Long command. [. . . ]