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Spring 2005
LaDS, GIEE, NTU
Outline
I/O driven
IRQ
Lab questions
Spring 2005
LaDS, GIEE, NTU
Handshaking
http://rebrown.com/rebrown/handsh.htm
Spring 2005
LaDS, GIEE, NTU
I/O Driven
Busy waitingDMA (Direct Memory Access)Interrupt
Spring 2005
LaDS, GIEE, NTU
I/O Driven
Busy waitingKeep asking I/O device if they have data to transfer or not.
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CPU
Spring 2005
LaDS, GIEE, NTU
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.
Spring 2005
LaDS, GIEE, NTU
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.
Spring 2005
LaDS, GIEE, NTU
Spring 2005
LaDS, GIEE, NTU
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.
Spring 2005
LaDS, GIEE, NTU
Assign a IRQ Number
In win98 & win MEclick “ 系統” and open “ 裝置管理員”
In win 2k & win XPthe same but...........
Spring 2005
LaDS, GIEE, NTU
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.
Spring 2005
LaDS, GIEE, NTU
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).
Spring 2005
LaDS, GIEE, NTU
Lab Question1
What are the IRQ numbers for yours devices?
Spring 2005
LaDS, GIEE, NTU
Lab Question2
How to change keyboard’s repeat delay and repeat rate?
Spring 2005
LaDS, GIEE, NTU
Lab Question3
How to setup/add/switch input methods?
