2003 Software Engineer笔试题
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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