四年級下冊英語練習題及參考答案

四年級下冊英語練習題及參考答案

2003 Software Engineer筆試題

1. Describe x86 PC’s architecture in a diagram cpu, core chipset, Cache, DR AM, IO-subsystem, IO-Bus

2. SWI instruction is often called a “supervisor call”, describe the act ions in detail
* Save the address of the instruction after the SWI in rl4_svc.
* Save the CPSR in SPSR_svc.
* Enter supervisor mode and disable IRQs.
* Set the PC to 08 and begin executing the instruction there.

3. What is PIO operation? advantage and disadvantage?
* DMA operation? advantage and disadvantage?
* Scatter/Gather DMA engine? how does it operate?

4. MP3 decoder related. (a flow chart of decoding is presented)
* advantages of Huffman encoding?
* why the aliasing reduction is necessary?
* analytical expression in mathematics of the IMDCT?
* which block in the flow chart is suitable for the software implementatio n and which for the hardware? why?

5. Assembly codes -> C language (about 15 lines).

6. Graduation thesis description.

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