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REAL-TIME SYSTEMS DESIGN AND ANALYSIS phần 10

Điều này, không có nghĩa là, một danh sách đầy đủ. Trong khi các trình biên dịch tốt nên cung cấp tối ưu hóa sản lượng lắp ráp các mã ngôn ngữ như vậy là, trong nhiều trường hợp, thực hiện các quyết định chỉ được liệt kê, điều quan trọng là để khám phá những gì mà tối ưu hóa là để tạo ra mã kết quả. | GLOSSARY 453 drive line In core memory a wire used to induce a magnetic field in a toroidshaped magnet. The orientation of the field represents either a 1 or a 0. DSI Delivered source instructions. See KLOC. dynamic memory Memory that uses a capacitor to store logic 1s and 0s and that must be refreshed periodically to restore the charge lost due to capacitive discharge. dynamic priority system A system in which the priorities to tasks can change. Contrast with fixed priority system. Dynamic Systems Development Method DSDM A lightweight programming methodology conceived as a methodology for rapid application development DSDM relies on a set of principles that include empowered teams frequent deliverables incremental development and integrated testing. effort One of Halstead s metrics see Chapter 8 . embedded software Software that is part of an embedded system. embedded system A computing machine contained in a device whose purpose is not to be a computer. For example the computers in automobiles and household appliances are embedded computers. Embedded computers use embedded software which integrates an operating system with specific drivers and application software. Their design often requires special software-hardware codesign methods for speed low power low cost high testability or other special requirements. emulator 1 The firmware that simulates a given machine architecture. 2 A device computer program or system that accepts the same inputs and produces the same outputs as a given system. enabled state In a data flow architecture when all necessary tokens have arrived and the input lines are full. Also called the ready state. encapsulation Property of a program that describes the complete integration of data with legal process relating to the data. entity relationship diagram A diagram that describes the important entities in a system and the ways in which they are interrelated. enumeration A list of permitted values. environment A set of objects outside the .