威盛笔试试题,标签：驾照笔试题目,腾讯笔试题目,http://www.77xue.com
　　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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