1. top-down design method is used in whole design.

2. Introduced the conception of the top-down design and its technical feature.

3. As we move forward, it is clear that top-down design is required for successful core system renewal projects.

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4. In the course of developing , top-down design and modularization are considered.

5. This assembly model provides a good environment for top-down design.

6. Using Top-Down design method, the whole PDDC function is divided to many units implemented respectively and organized to the module library.

7. The design of MCS-51 Microcontroller is followed the Top-Down design way, including system partition coding (VHDL) RTL simulation synthesis, gate level simulation ect.

8. Top-down design and stepwise refinement urged the programmer to set forth the broad outlines of a procedure first and only later fill in the details.

9. The overall design using top-down design, extensive use of modular operation of the device.

10. The top-down design methodology is used to realize the PCI bus controller.

11. Voltage mode output, which is used in AMD CPU reference clock top-down design method.

12. The rapid design of assembly and parts is realized with top-down design method.

13. The key technology, research state, problems and development directions of top-down design are surveyed.

14. In the third part , a low - noise CPPLL circuit is designed using top-down design method.

15. Design for testability of CSC71018, an application-specific IC for programmable switchboard with top-down design, is introduced in the paper.