User manual MAXTOR ST3250A

[. . . ] ST3491 Family: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ST3250A, ST3291A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ST3391A, ST3491A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AT Interface Drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Product Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] B 15 2. 3 Drive I/O connector The drive interface connector has 40 pins, with 2 rows of 20 male pins on 100-mil centers. Use a 40-pin, nonshielded cable connector with 2 rows of 20 female contacts on 100-mil centers. The maximum cable length is 18 inches (457 mm). The recommended part numbers are listed below. AMP Du Pont 1-499496-0 66900-040 Dimensions are in inches 0. 100 ± 0. 010 0. 70 ± 0. 010 0. 235 ± 0. 025 0. 230 ± 0. 003 0. 025 ± 0. 002 0. 025 ± 0. 002 0. 160 1. 90 2. 00 0. 100 typ 0. 070 ± 0. 010 Figure 4. AT interface drive connector ST3491 Family AT Product Manual, Rev. B 17 3. 0 Interface description The drive complies with all ATA interface specifications. The interface consists of single-ended, TTL-compatible receivers and drivers communicating through a 40-conductor flat-ribbon, nonshielded cable with a maximum length of 18 inches (0. 46 meters) using an asynchronous interface protocol. The drivers can sink up to 24 mA and drive a load up to 300 pF. 3. 1 AT interface connector pin assignments The signal name and signal direction for each I/O connector pin is described in Figure 5 on page 18. See the Seagate ATA Interface Reference Manual, publication number 36111-xxx, for a complete description of each pin. If the signal name is followed by a minus sign (­), the signal is active low. The drive does not use the SPSYNC­ signal. 3. 2 Bus signal levels Signals that the drive sends have the following output characteristics, measured at the drive connector. Logic low Logic high 0 to 0. 4V 2. 5 to 5. 25V Signals that the drive receives must have the following input characteristics, measured at the drive connector. Logic low Logic high 0 to 0. 8V 2. 0 to 5. 25V 18 ST3491 Family AT Product Manual, Rev. B Drive pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 *28 29 30 31 32 33 *34 35 36 37 38 *39 40 Signal name Reset­ Ground DD7 DD8 DD6 DD9 DD5 DD10 DD4 DD11 DD3 DD12 DD2 DD13 DD1 DD14 DD0 DD15 Ground (removed) DMARQ Ground DIOW­ Ground DIOR­ Ground IORDY CSEL DMACK­ Ground INTRQ IOCS16­ DA1 PDIAG­ DA0 DA2 CS1FX­ CS3FX­ DASP­ Ground Host pin # and signal description Host Reset Ground Host Data Bus Bit 7 Host Data Bus Bit 8 Host Data Bus Bit 6 Host Data Bus Bit 9 Host Data Bus Bit 5 Host Data Bus Bit 10 Host Data Bus Bit 4 Host Data Bus Bit 11 Host Data Bus Bit 3 Host Data Bus Bit 12 Host Data Bus Bit 2 Host Data Bus Bit 13 Host Data Bus Bit 1 Host Data Bus Bit 14 Host Data Bus Bit 0 Host Data Bus Bit 15 Ground (No Pin) DMA Request Ground Host I/O Write Ground Host I/O Read Ground I/O Channel Ready Cable Select DMA Acknowledge Ground Host Interrupt Request Host 16 Bit I/O Host Address Bus Bit 1 Passed Diagnostics Host Address Bus Bit 0 Host Address Bus Bit 2 Host Chip Select 0 Host Chip Select 1 Drive Active or Slave Present 40 Ground 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 *Indicates master-slave signals (details shown below). Drive 1 (slave) 28 34 39 Drive 0 (master) 28 34 39 Host CSEL PDIAG­ DASP­ 28 34 39 Figure 5. AT connector pin assignments ST3491 Family AT Product Manual, Rev. B 19 3. 3 Configuration jumpers Figure 6 shows the location of the options jumper block. The jumper block accepts 2-mm (0. 079-inch) jumpers. If you use a jumper that is not the correct size, you may damage the jumper block and the jumper. Use the jumpers supplied with the drive. 4-pin power connector 1 2 3 4 Circuit board +5V +5V return +12V return +12V Available 2-pin header F ro nt Drive activity LED 40-pin AT interface connector 8-pin options jumper block 7531 3-pin power connector Keyway Circuit board 123 Ground +12V +5V Front The drive is a master; the slave is either an ST3491 family drive or another ATA-compatible drive, or there is no slave. The drive is a master; a slave is present, but it is not ATA-compatible. [. . . ] When the Write Multiple command is issued, the Sector Count register contains the number of sectors (not the number of blocks or the block count) requested. If the number of requested sectors is not evenly divisible by the block count, as many full blocks as possible are transferred, followed by a final, partial block transfer. The partial block transfer is for n sectors, where n = remainder (sector count / block count) 32 ST3491 Family AT Product Manual, Rev. B If the Write Multiple command is attempted before the Set Multiple Mode command has been executed or when Write Multiple commands are disabled, the Write Multiple operation is rejected with an aborted command error. [. . . ]