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威盛Software Engineer的笔试题
作者：佚名 来源：不详 发布时间：2007-4-27 8:38:00
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 implementation
and which for the hardware? reason?
5. Assembly codes -> C language (about 15 lines).
6. Graduation thesis description.
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