006[1].威盛software_engineer.txt

总结了一些软硬件方面的笔试面试题

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
   a. Save the address of the instruction after the SWI in rl4_svc.
   b. Save the CPSR in SPSR_svc.
   c. Enter supervisor mode and disable IRQs.
   d. Set the PC to 08 and begin executing the instruction there.
3.a. What is PIO operation? advantage and disadvantage?
  b. DMA operation? advantage and disadvantage?
  c. Scatter/Gather DMA engine? how does it operate?
4. MP3 decoder related.(a flow chart of decoding is presented)
a. advantages of Huffman encoding?
b. why the aliasing reduction is necessary?
c. analytical expression in mathematics of the IMDCT?
d. which block in the flow chart is suitable for the software implementatio
n
    and which for the hardware? reason?
5. Assembly codes -> C language (about 15 lines).
6. Graduation thesis description.
1. write down the 7 types of exception and vector address of ARM.
2. Briefly describe the signals(TRST#, TCK, TMS,TDI,TDO) of  JTAG.
3.What is the instruction for switching the ARM processor to excute Thumb
  instructions?
4. 写出下面所写的全文：
  a) FIR filter;
  b)IIR filter;
   c)DFT(离散傅立叶变换）