Medium Optical Disk (RW551/RW552) Library
6–18
EK–MOL80–SV. B01
The following sections outline disk layout for the 650-Mbyte and 1.3-GByte
optical disks. Throughout this section, the sector number is that of a 1,024
bytes/sector disk. The value of a 512 bytes/sector disk is written inside
parentheses just after the value for the 1,024 bytes/sector disk.
Controller
The controller is a highly-specialized integrated circuit that handles SCSI
control, data buffering, and encode/decode.
The data buffer function provides a buffer to speed match transfers to and from
the host computer and the optical disk. The data buffer provides a cache for read
and write operations, optimizing the speed of these transfers. The C1113 uses a
one-megabyte buffer memory.
This controller provides the SCSI interface connection to the host computer. This
interface consists of both the electrical signals and the firmware which decodes
the various commands and messages on the SCSI bus and instructs the drive to
take appropriate action.
The encode/decode function encodes and decodes data for read and write
transfers. During a write function user data is sent via the SCSI bus. The encoder
converts the parallel data into an encoded serial bit stream that includes all the
format and error correction features required to meet the ANSI and ISO
specifications. During reads, the decoder converts the serial data stream, which
includes format and error correction features, into parallel data.
CPU
The central processing unit processes all device functions including the loading
motor.
Gate Array
This component contains circuitry to interconnect the major blocks (CPU, DSP,
and write/read channel).
DSP (Digital Signal Processor)
The DSP controls the following servos: spindle motor/speed, laser power control,
track following, seek/position maintenance, focus actuation, fine position
actuation, and coarse position actuation. Whenever the drive is performing a read
or write operation, all these servos are actuated.
Содержание RW551
Страница 27: ...Medium Optical Disk RW551 RW552 Library 3 2 EK MOL80 SV B01 Figure 3 2 Rear Panel SCSI Connect...
Страница 34: ...Chapter 3 Product Configuration and Operation EK MOL80 SV B01 3 9 Figure 3 4 Control Panel Menu Tree...
Страница 92: ...end...
Страница 139: ...Chapter 5 Removal and Replacement EK MOL80 SV B01 5 47 Figure 5 49 Jukebox Exploded View 1 of 2...
Страница 140: ...Medium Optical Disk RW551 RW552 Library 5 48 EK MOL80 SV B01 Figure 5 49 Jukebox Exploded View 2 of 2...
Страница 141: ...Chapter 5 Removal and Replacement EK MOL80 SV B01 5 49 Figure 5 50 Jukebox Power Harness...
Страница 142: ...Medium Optical Disk RW551 RW552 Library 5 50 EK MOL80 SV B01 Figure 5 51 Jukebox Pulley and Rope Diagram...
Страница 166: ...Chapter 6 Theory of Operation EK MOL80 SV B01 6 23 Figure 6 10 User Zone Layout for 1 3 Gbyte Media g 1...
Страница 167: ...Medium Optical Disk RW551 RW552 Library 6 24 EK MOL80 SV B01 Figure 6 11 User Zone Layout for 1 3 Gbyte g 16...
Страница 168: ...Chapter 6 Theory of Operation EK MOL80 SV B01 6 25 Figure 6 12 User Zone Layout for 2 6 Gbyte Media 1 024 bytes sector...
