2003 Software Engineer笔试题

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.