R O 6 5 2 A RODIME NO MORE PRODUCED Native| Translation ------+-----+-----+----- Form 3.5"/HH Cylinders 306| | | Capacity form/unform 21/ 25 MB Heads 4| | | Seek time / track 85.0/18.0 ms Sector/track 34| | | Controller SCSI1 SINGLE-ENDED Precompensation Cache/Buffer 4 KB FIFO BUFFER Landing Zone Data transfer rate 0.937 MB/S int Bytes/Sector 512 MB/S ext Recording method RLL 2/7 operating | non-operating -------------+-------------- Supply voltage 5/12 V Temperature *C 10 50 | Power: sleep W Humidity % 10 85 | standby W Altitude km | idle 13.0 W Shock g 10 | 30 seek W Rotation RPM 2746 read/write W Acoustic dBA spin-up W ECC Bit 32 MTBF h 12000 Warranty Month Lift/Lock/Park NO Certificates ********************************************************************** L A Y O U T ********************************************************************** RODIME RO 650/750A USER MANUAL P/N USM 00113 +----------------------------------------------XXXXXXX----+ ++ LED 1 4 P2 | ++ | | | | 6-5 | S1 | | | ++2-1 | |||XX S | |||XX C | ++|XX S | ++|XX I | Terminator|||XX | Packs |||XX | ++|XX P1 | ++|XX | |||XX | |||XX | ++|XX +---------------------------------------------------------+2 1 ********************************************************************** J U M P E R S ********************************************************************** RODIME RO650/750A USER MANUAL P/N USM 00113 Jumper Setting ============== x = Factory setting S1 SCSI ID ----------- +----------+-----------------------+ | SCSI ID | Jumpers | +-2--4--6-+ | | 1-2 | 3-4 | 5-6 | | o o o | +----------+-------+-------+-------+ | o o o | | x 0 | OPEN | OPEN | OPEN | +-1--3--5-+ | 1 | OPEN | OPEN | CLOSED| | 2 | OPEN | CLOSED| OPEN | | 3 | OPEN | CLOSED| CLOSED| | 4 | CLOSED| OPEN | OPEN | | 5 | CLOSED| OPEN | CLOSED| | 6 | CLOSED| CLOSED| OPEN | | 7 | CLOSED| CLOSED| CLOSED| +----------+-------+-------+-------+ DC Power and pin connector assignments -------------------------------------- pin 1 +12 VDC pin 2 Ground pin 3 Ground pin 4 + 5 VDC ********************************************************************** I N S T A L L ********************************************************************** RODIME RO650/750A USER MANUAL P/N USM 00113 Drive Mounting RO 650A ---------------------- A sub-frame with tapped holes is provided with each drive and permits base or side mounting. This frame is fixed to the module via shock absorbing mounts. The drive may be oriented in any axis. When installing the drive into an enclosure at least 0.1 inch clearance must be maintained around the entire drive to ensure vibration isolation, prevent obstruction of the breather filter and the creation of ground loops. Screw size for RO 650A drive mounting is 6-32 inch; 0.25 inch max. thread engagement depth. Mounting RO 750A ---------------- The RO 750A consists of an RO 650A module and sub-frame which is attached to additional side brackets. The complete assembly meets the form factor requirements of a "half-height" 5.25 inch Winchester disk drive with the same tapped mounting holes. Screw size for RO 750A drive mounting is 6-32 UNC; 0.25 inch max. thread engagement depth. Multiple Drives --------------- Up to seven drives may be radially connected to a single host adapter. The adapter itself requires a unique SCSI address. RO 650A assignment is achieved by placing jumpers on the SCSI selector, designated S1. The drive is shipped with an SCSI address of 0 i.e. no jumpers are present. D.C. Power Connector -------------------- DC power is provided by a four pin AMP Mate-N-Lok connector (P2/J2) part number 350211-1 mounted on the solder side of the board. The re- commended mating connector is AMP part number 1-480424-0 utilising AMP pins part number 350078-4. Interface Connector ------------------- The RO 650A disk drive interface to a host adapter using a 50 pin, nonshielded flat ribbon connector. This connector is designated J1 and connects to the drive via connector P1. The pins are numbered 1 through 50. Pin 2 is located on the end of the board furthest from the DC power connector and is market. The recommended mating connector is 3M ribbon connector, P/N 3425-3000. Indicator --------- The drive has a single LED visible through the front facia, designated LED1. This LED will only be on when the drive is selected, otherwise it will be off. At the end of the power-up routine the LED will remain off. This LED is also used to flash fatal error messages should such fault conditions exists on the drive. Electrical Interface -------------------- The basic operating configuration consists of a host computer, host adapter and the RO 650A disk drive. The host is a computer system, the host adapter is an interface between the host's bus and the disk drive. All signals are active low and use open collector drivers. The bus should be terminated at both ends with 220 ohms to +5V and 330 ohms to ground at each of the cable. Output Characteristics ---------------------- Each signal driven by the RO 650A has the following output characteristics when measured at the drive's connector: Signal assertion = 0.0 volts dc to 0.4 volts dc. Minimum driver output capacity = 48 milliamps (sinking) at 0.5 volts dc. Signal negation = 2.5 volts dc to 5.25 volts dc. Input Characteristics --------------------- Each signal received by the RO 650A shall have the following input characteristics when measured at the drive's connector: Signal true = 0.0 volts dc to 0.8 volts dc. Maximum toatl input load = -0.4 milliamp at 0.4 volts dc. Signal false = 2.0 volts dc to 5.25 volts dc. Minimum input hysteresis = 0.2 volts dc. Terminator Power (Optional) --------------------------- The RO 650A is configured to supply terminator power,(TERMPWR), with the following characteristics: VTERM = 4.0 volts dc to 5.25 volts dc. 800 milliamps minimum source drive capability. 1.0 milliamp maximum sink capability. Hardware Implementation ----------------------- SCSI is implemented on a 50-way bus which has multiple, independent, interchangeable slots. The main advantage of a bus is that several tasks can be interleaved simultaneously on the bus. The RO 650A may operate in any of the configurations shown. Sample SCSI Configuration Host Adapter +--------+ | +-----+ Single Initiator, Single Target |ComputerXXX--------+Drive| +--------+ SCSI Bus+-----RO 650A +--------+ SCSI +-----+ Single Initiator, Multiple Target |ComputerXXX-----+--+Drive| +--------+| Bus | +-----RO 650A Host | +-----+ Adapter +--+Drive| +-----RO 650A Host Adapter | +--------+| SCSI Bus+-----+ Multiple Initiator, Multiple Target |ComputerXXX-+---+--+Drive| + +--------+ | | +-----+ | +--------+ | | +-----+ | |ComputerXXX-+ +--+Drive| + +--------+| | +-----+ | Host Adapter | +-----+ | +--+Drive| +---- RO 650A Intelligent Disk Drive | +-----+ | | +-----+ | +--+Drive| + Host Adapter | +-----+ | +--------+| | +-----+ | |ComputerXXX-----+--+Drive| + +--------+ +-----+ Buffer Memory ------------- A static 4K RAM data buffer is used as a first in first out (FIFO) circuit. This buffer i sused to enhance drive performance by storing blocks of data, thus allowing speed matching between the disk drive and the host. For convenience the default values set by Rodime are listed below: Format Parameters ----------------- Sectors per track = 32 Bytes per sector = 532 Interleave Factor = 2 Geometry Parameters ------------------- Number of cylinders = 306 Number of heads = 4 ********************************************************************** F E A T U R E S ********************************************************************** RODIME RO 650A/750A USER MANUAL P/N USM 00113 Model Description ================= The RO 650A/750A represents Rodime's latest advance in innovative techology, offering arbitrating 3.5" Winchester disk drive with SCSI (Small Computer System Interface) and embedded drive controller, realising 20 MB of formatted capacity. The design is based on the field proven RO 350 and RO 650 series and takes Winchester technology a step with further with a number of features and benefits including a 4 Kbyte, FIFO data buffer for rapid data transfer and complete host software device independence by implementation of a common command set. The drive and controller use VLSI and surface mounted component techniques to contain these features within the standard 3.5" form factor. Like all Rodime disk drives, the new series features rugged construction and few internal parts, making them suitable for the harsh environment encountered by portable computers. Encoder/decoder --------------- The encoder/decoder provides an efficient interface between the NRZ data required by the disk controller and 2,7 run length limited code used in the drive. The encoder/decoder also includes address mark generation and detection logic. Disc Controller --------------- The disk controller performs the basic read/write functions. For this purpose this device provides the necessary serialisation/deseriala- tion, formatting, ECC generation and correction functions. Sector Level Defect Handling ---------------------------- The Drive maintains a list of all the media defects found during the manufacturing process, known as the Primary Defect List or P-List. This list can be read when using the READ DEFECT DATA command. Media defects which occur during the life of the drive may be logically removed vy using the RE-ASSIGN BLOCKS command. Any such defects are appended to the Growing Defect List or G-List, which can also be read using the READ DEFECT DATA command. Seek Time --------- +----------------------------------+--------+ |Track-to-Track msec. typ. | 18 | +----------------------------------+--------+ |Average msec. typ. | 85 | | msec. max. | 180 | +----------------------------------+--------+ |Latency msec. avg. | 10.9 | +----------------------------------+--------+ Defect Handling Overview ------------------------ Rodime undertake testing on the RO 650A/750A disk drive, using both analogue and digital techniques, to identify suspect areas on the disk surface. These are known as media defects and are considered to be unreliable areas on the disk surface, for data recording purposes. These data defects are printed on a label fixed to the top cover of the drive. This defect map, as its known, specifies defects in terms of cylinder, head and bytes from index. The exact location of a disk flaw will always be the same, as index is a timing signal which marks a fixed reference point on the drive. This same information is also recorded on a special maintenance track on the drive. One of the principal features of SCSI is that the host system "perceives" any disk drive as a series of contiguous, defect-free, logical blocks. This implies that some mechanism must exist to over- come media defects. Although this function is mostly transparent to the user. Spare Sectors and Tracks ------------------------ In order to implement a defect handling scheme specific sectors and tracks on the drive are reserved as spare. A feature of the RO650A/750A is that the sector size is variable be- tween 128D and 4096D bytes per sector. This is user selectable by issuing a MODE SELECT (class 0, opcode 15H) command. Once the user selects the required sector size, the drive automatic- ally calculates the optimum number of sectors per track, leaving one spare sector on every track (regardless of sector size). On the RO 650A/750A this realises a total of 1024 spare sectors - 306 cylinders; 4 heads per cylinder. Seven spare tracks are also reserved for defect handling. These tracks are NOT a part of the logical address space normally available to the user. Spare Tracks +-----+-------+------------+---------------+ | Cyl.| Head | Format | Function | +-----+-------+------------+---------------+ | -2 | 1 | User Format| Spare Track 1 | +-----+-------+------------+---------------+ | -2 | 2 | User Format| Spare Track 2 | +-----+-------+------------+---------------+ | -2 | 3 | User Format| Spare Track 3 | +-----+-------+------------+---------------+ | -1 | 0 | User Format| Spare Track 4 | +-----+-------+------------+---------------+ | -1 | 1 | User Format| Spare Track 5 | +-----+-------+------------+---------------+ | -1 | 2 | User Format| Spare Track 6 | +-----+-------+------------+---------------+ | -1 | 3 | User Format| Spare Track 7 | +-----+-------+------------+---------------+ Sector Interleaving = 2:1