Ăn mòn ướt - Đây là kỹ thuật thông dụng nhất trong công nghệ bán dẫn. Ngay từ công đoạn phiến vừa mới được cưa ra khỏi thỏi silion từ nhà máy sản xuất phiến, các hóa chất đã được sử dụng để mài nghiền và đánh bóng cuối cùng chúng ta thu được một tấm silicon phẳng và nhẵn. Đối với những thiết bị đơn lẻ hoặc mạch tích hợp có kích thước đủ lớn ( 3 µm), hoá chất ăn mòn được sử dụng để khắc những hoạ tiết và mở cửa sổ trên lớp vật liệu điện. | the data is present on the address bus. The memory responds with the requested data and this data is moved from DBI to DB and into accumulator A ACCA to complete execution of the instruction These RTL statements describe at a high level the execution of a simple microprocessor instruction. ISPS Specification and Simulation The instruction Set Processor Specification ISPS language was developed for the certification architectural evaluation simulation fault analysis and design automation of instruction set processors. The language provides a behavioral rather than a structural description. There arc no part numbers pin assignments layouts or technologies defined. Of course some structural information such as register lengths data path widths and connections of components arc necessarily a part of the simulation. The operation of each part of a processor is specified algorithmically by its behavior. The ISPS notation includes an interface and entities. First the carriers memory elements are defined. This usually includes an array of memory locations with a specified bit width and number of words. Second the procedures necessary for the execution of the processor statements arc defined. This usually includes instruction decoding effective address calculation arithmetic and logical operation definitions and memory load storc functions. ISPS provides a typical set of program operators including assignment if case and repeat. Additionally provisions arc made for concurrent or sequential processing. It is possible to specify the bit length of words. Aliases are available for variables and bit fields of variables can be addressed directly by other variables. Normal number representations include binary hex decimal and octal. An example will be presented to demonstrate briefly some of the capabilities of the ISPS language. The Motorola 68000 microprocessor will be used as the example to describe typical ISPS capabilities. Figure shows the definition of the memory and
