This chapter discusses how VHDL is used for logic synthesis. It contains the following sections: ... more This chapter discusses how VHDL is used for logic synthesis. It contains the following sections: • Synthesis-Ready Code • CASE Statement Synthesis • FOR Statement Synthesis • A 4-Bit Adder • Synthesis and the WAIT Statement • State Machines in VHDL • Predefined Attributes for Synthesis
My first experiences with decimal computer arithmetic in college (1963) influenced my subsequent ... more My first experiences with decimal computer arithmetic in college (1963) influenced my subsequent career decisions and projects as described herein. Many popular early computers focused on commercial applications for which decimal arithmetic was appropriate. These digitserial implementations did not minimize hardware cost, and provided the precision needed by the application. Decimal arithmetic as taught in elementary school is a fine starting point for describing computer operation, but for nonengineers the hardware realization of an adder is mysterious. Routing circuits, while not always practical, illustrate how two-bits can be added by using switches, relays, or MOSFET's.
This chapter discusses how VHDL is used for logic synthesis. It contains the following sections: ... more This chapter discusses how VHDL is used for logic synthesis. It contains the following sections: • Synthesis-Ready Code • CASE Statement Synthesis • FOR Statement Synthesis • A 4-Bit Adder • Synthesis and the WAIT Statement • State Machines in VHDL • Predefined Attributes for Synthesis
Logic simulator systems need to represent undefmed or "unknown" values for circuits with unresolv... more Logic simulator systems need to represent undefmed or "unknown" values for circuits with unresolved electrical values or states, which might be the output of this circuit model during the first 4 ns of simulated time. Accordingly, VHDL supports a variety of data types useful to the hardware modeler for both simulation and synthesis, as well as bits, Booleans, and numbers, which are defmed in the Package STANDARD.
Because of the ever growing density of large scale integrated (LSI) circuits a "computer on a chi... more Because of the ever growing density of large scale integrated (LSI) circuits a "computer on a chip" was inevitable. But in 1970 we could only get about 2000 transistors on a chip, and a conventional CPU would need about 10 times that number. We developed two "microcomputers" 10 years ahead of "schedule," by scaling down the requirements and using a few other "tricks" described in this paper.
IEEE Transactions on Consumer Electronics, Aug 1, 1977
Advances in semiconductor technology make it practical to integrate complex digital computers ont... more Advances in semiconductor technology make it practical to integrate complex digital computers onto a few chips suitable for use in a variety of consumer oriented applications such as video games. 1 The introduction of these first "micro-computers" allowed production of a number of interesting arcade video games. 2 Now as microcomputers get smaller and cheaper they bring programmable TV games into our homes. 3 Some of the design principles and techniques used in microcomputer based video games are described here.
This chapter diagrams VHDL design hierarchy, structure, and VHDL language syntax. It is organized... more This chapter diagrams VHDL design hierarchy, structure, and VHDL language syntax. It is organized into the following sections: Design Hierarchy Library Units Declarations Specifications Use & Library Clauses Sequential Statements Concurrent Statements Predefined Attributes Package STANDARD TEXTIO Package
This chapter discusses how VHDL is used for logic synthesis. It contains the following sections: ... more This chapter discusses how VHDL is used for logic synthesis. It contains the following sections: • Synthesis-Ready Code • CASE Statement Synthesis • FOR Statement Synthesis • A 4-Bit Adder • Synthesis and the WAIT Statement • State Machines in VHDL • Predefined Attributes for Synthesis
My first experiences with decimal computer arithmetic in college (1963) influenced my subsequent ... more My first experiences with decimal computer arithmetic in college (1963) influenced my subsequent career decisions and projects as described herein. Many popular early computers focused on commercial applications for which decimal arithmetic was appropriate. These digitserial implementations did not minimize hardware cost, and provided the precision needed by the application. Decimal arithmetic as taught in elementary school is a fine starting point for describing computer operation, but for nonengineers the hardware realization of an adder is mysterious. Routing circuits, while not always practical, illustrate how two-bits can be added by using switches, relays, or MOSFET's.
This chapter discusses how VHDL is used for logic synthesis. It contains the following sections: ... more This chapter discusses how VHDL is used for logic synthesis. It contains the following sections: • Synthesis-Ready Code • CASE Statement Synthesis • FOR Statement Synthesis • A 4-Bit Adder • Synthesis and the WAIT Statement • State Machines in VHDL • Predefined Attributes for Synthesis
Logic simulator systems need to represent undefmed or "unknown" values for circuits with unresolv... more Logic simulator systems need to represent undefmed or "unknown" values for circuits with unresolved electrical values or states, which might be the output of this circuit model during the first 4 ns of simulated time. Accordingly, VHDL supports a variety of data types useful to the hardware modeler for both simulation and synthesis, as well as bits, Booleans, and numbers, which are defmed in the Package STANDARD.
Because of the ever growing density of large scale integrated (LSI) circuits a "computer on a chi... more Because of the ever growing density of large scale integrated (LSI) circuits a "computer on a chip" was inevitable. But in 1970 we could only get about 2000 transistors on a chip, and a conventional CPU would need about 10 times that number. We developed two "microcomputers" 10 years ahead of "schedule," by scaling down the requirements and using a few other "tricks" described in this paper.
IEEE Transactions on Consumer Electronics, Aug 1, 1977
Advances in semiconductor technology make it practical to integrate complex digital computers ont... more Advances in semiconductor technology make it practical to integrate complex digital computers onto a few chips suitable for use in a variety of consumer oriented applications such as video games. 1 The introduction of these first "micro-computers" allowed production of a number of interesting arcade video games. 2 Now as microcomputers get smaller and cheaper they bring programmable TV games into our homes. 3 Some of the design principles and techniques used in microcomputer based video games are described here.
This chapter diagrams VHDL design hierarchy, structure, and VHDL language syntax. It is organized... more This chapter diagrams VHDL design hierarchy, structure, and VHDL language syntax. It is organized into the following sections: Design Hierarchy Library Units Declarations Specifications Use & Library Clauses Sequential Statements Concurrent Statements Predefined Attributes Package STANDARD TEXTIO Package
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