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LAB 3

LAB 3. TA: Hu-Hsi Yeh( 葉護熺 ) Date: 2005 3/21 E-mail: r93943122@ntu.edu.tw. Outline. I/O driven IRQ Lab questions. Handshaking. http://rebrown.com/rebrown/handsh.htm. I/O Driven. Busy waiting DMA (Direct Memory Access) Interrupt. I/O Driven.

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LAB 3

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  1. LAB 3 TA: Hu-Hsi Yeh(葉護熺) Date: 2005 3/21 E-mail:r93943122@ntu.edu.tw

  2. Outline • I/O driven • IRQ • Lab questions

  3. Handshaking http://rebrown.com/rebrown/handsh.htm

  4. I/O Driven • Busy waiting • DMA (Direct Memory Access) • Interrupt

  5. I/O Driven • Busy waitingKeep asking I/O device if they have data to transfer or not.

  6. I/O Driven • DMA (Direct Memory Access)Short for DMA, a technique for transferring data from main memory to a device without passing it through the CPU.

  7. I/O Driven • IRQ( Interrupt Request) • Some hardware need some methods to call the process of CPU. But there should be some order and priority.

  8. IRQ Conflicts • There are few IRQ numbers open, but we still have a lot of devices such as USB, AGP, PCI, RAID, SATA, LAN, 1394. • Solution: We have to share IRQ numbers. It depends on each motherboard.

  9. Assign a IRQ Number • In win98 & win MEclick “系統” and open “裝置管理員” • In win 2k & win XPthe same but...........

  10. Plug-and-Play (PnP) • Plug-and-Play automatically tells the software (device drivers) where to find various pieces of hardware (devices) such as modems, network cards, sound cards, etc.

  11. Plug-and-Play (PnP) • PnP allocates the following "bus-resources" to both drivers and hardware: I/O addresses, memory regions, IRQs, DMA channels (ISA bus only).

  12. Lab Question1 • What are the IRQ numbers for yours devices?

  13. Lab Question2 • How to change keyboard’s repeat delay and repeat rate?

  14. Lab Question3 • How to setup/add/switch input methods?

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