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SCSI Interface

SCSI Interface. Introduction. Small Computer System Interface Why this Article? SCSI is System level interface SCSI bus can hold up to 8 units. History of SCSI. In 1979 , Shugart Associates System Interface(SASI) was created

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SCSI Interface

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  1. SCSI Interface

  2. Introduction • Small Computer System Interface • Why this Article? • SCSI is System level interface • SCSI bus can hold up to 8 units

  3. History of SCSI • In 1979 , Shugart Associates System Interface(SASI) was created • In 1981 , Alan Shugart teamed up with NCR corporation to make SASI into ANSI standard • In 1982 , ANSI set up committee to work on standardizing SASI • In 1986 , First version of SCSI was published

  4. Setting Up SCSI • SCSI Host Adapter • SCSI Compatible Peripherals • SCSI Cabling • SCSI Termination

  5. LT 1086 Chip SCSI Termination Active Termination Passive Termination

  6. Installation Overview • Put a SCSI Host Adapter into a PCI Slot • Assign a SCSI ID to the peripherals. This is done with a jumper or DIP switch • Enable or Disable SCSI parity on the peripheral • Terminate both end of SCSI

  7. Bus Mastering • IDE transfer data using PIO Protocol • SCSI also uses DMA on ISA bus • The device which is connected on PCI bus takes control of system bus from CPU and transfers without using DMA controller • Bus Mastering is advanced form of DMA

  8. DMA • DMA itself is a bus master device • DMA controller sends a signal to CPU while can be doing something else • DMA is used to perform transfer without CPU intervention to or from peripherals

  9. DMA Limitations • The DMA slave is passive • DMA can only transfer blocks of contiguous memory content • DMA is generally slower. The original Intel 8237 DMA controller was extremely slow

  10. Comparisons of Drives • Configuration • Expandability and Number of Devices • S/W and O/S Compatibility • Noise and Heat • Media Access Speed • Interface Access Speed

  11. Performance • Drive Performance • Maximum Interface Data Transfer Speed • Single vs. Multiple Devices • Single vs. Multitasking • Device Mixing Issues

  12. Comparing Cost • Additional Hardware • Lower Volume • Niche Market • More Advance Technology

  13. Advantage • SCSI is better than IDE • IDE is cheaper than SCSI • SCSI is faster than IDE • Slow IDE devices also slow down other devices

  14. IDE or SCSI? SCSI is growing The Future of SCSI

  15. Conclusion

  16. Any Questions ???

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