威盛Software Engineer笔试题--2003

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　　2003 Software Engineer笔试题

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

　　2. SWI instruction is often called a “supervisor call”, describe the actions 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.

　　* 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 implementation and which for the hardware? why?

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

　　6. Graduation thesis description.