What is rtl in computer architecture

This article needs additional citations for Please help Find sources: · · · · ( December 2009) ( In register-transfer level ( RTL) is a design abstraction which models a Register-transfer-level abstraction is used in Unlike in software compiler design, where the register-transfer level is an intermediate representation and at the lowest level, the RTL level is the usual input that circuit designers operate on. In fact, in circuit synthesis, an intermediate language between the input register transfer level representation and the target RTL description [ ] A synchronous circuit consists of two kinds of elements: registers (Sequential logic) and For example, a very simple synchronous circuit is shown in the figure. The When designing digital integrated circuits with a register-transfer level. The term refers to the fact that RTL focuses on describing the flow of signals between registers. As an example, the circuit mentioned above can be described in VHDL as follows: D <= not Q ; process ( clk ) begin if rising_edge ( clk ) then Q <= D ; end if ; end process ; Using an At the register-transfer level, some types of circuits can be recognized. If there is a cyclic path of logic from a register's output to its input (or from a set of registers outputs to its inputs), the circuit is called a RTL in the circuit design cycle [ ] RTL is used in the An RTL description is usually converted to a Power estimation techniques for RTL [ ] The most accurate power analysis tools are availab...

Prof. S.Meenatchi, SITE, VIT Addressing Modes• Specify the way the operands are selected during program execution.• Usage – To give programming flexibility to the user• pointers to memory, counters for loop control, indexing of data, …. – To reduce the number of bits in the addressing field of the inst. Prof. S.Meenatchi, SITE, VIT Operation cycle of the computer• Instruction Cycle- 3 phases 1) Fetch the inst. from memory.2) Decode the inst. (determine the operation, addressing mode and location of the operands)3) Execute the inst. • Program Counter (PC)– Keeps track of the insts. in the program stored in memory.– Holds the address of the inst. to be executed next.– Incremented each time an inst. is fetched from memory Prof. S.Meenatchi, SITE, VIT Different Types of addressing mode 1. Implied Addressing Mode2. Immediate Addressing Mode3. Direct Addressing Mode4. Indirect Addressing Mode5. Register Direct Addressing Mode6. Register Indirect Addressing Mode7. Displacement Addressing Mode (combines the direct addressing and register addressing modes)1. Relative Addressing Mode2. Indexed Addressing Mode3. Base Addressing Mode 8. Auto Increment and Auto Decrement Addressing Mode Prof. S.Meenatchi, SITE, VIT 1. Implied Mode• Operands are specified implicitly in the instruction.• No address field is required• 0-address inst. are implied mode inst.• Used by Stack-organized computer • Examples: – COM : Complement Accumulator• Operand in AC is implied in the inst. – ADD • Operands a...

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Synopsys RTL Architect uses a fast, multi-dimensional implementation prediction engine that enables RTL designers to predict the power, performance, area, and congestion impact of their RTL changes. Built on a unified data model, Synopsys RTL Architect directly leverages Synopsys’ world-class implementation and golden signoff solutions, including Synopsys

This article looks at the use cases and benefits of the arbiter with an implementation of a simple priority arbiter in VHDL. Arbitration is an important part of any modern computer system. From bus arbitration in communication protocols like I 2C and CAN, to memory arbitration in multi-processor systems, arbiters can be found anywhere a resource needs to be shared. Arbiters can be synchronous (i.e., clocked) or asynchronous, and they work by inputting requests and granting access to resources based on those requests. In the embedded world, resources are always limited. Using an arbiter can simplify resource control and add priority to competing subsystems, all while increasing both system performance and robustness. The Basics What Is an Arbiter? At its most basic, an arbiter is a device that takes as input N requests, and outputs a single grant, in the form of a one-hot. A one-hot is a group of bits of arbitrary size consisting of all zeros except for one; i.e., one bit is logic high, or “hot.” In this way, the arbiter looks at its set of inputs and allows a single device access to the resource. Example of an Arbiter in Action Let's say we have three devices each with a request signal tied to an arbiter. “Device” here is used as a general term for any requester. The requester could be a FIFO (first-in, first-out)queue, a CPU, a state machine, etc. When the device needs access to a resource, it simply sets its request signal high. The arbiter checks its inputs and grants a...

This article provides an overview of Register Transfer Level (RTL) Design, it describes the fundamentals of RTL design and the process of RTL design. The article will also discuss RTL synthesis, RTL for synchronous and asynchronous design, RTL simulation, RTL in FPGA and ASIC and RTL design tools. What is RTL Design? Register Transfer Level (RTL) is a representation of the digital circuit at the abstract level. There are two elements in digital circuits: Sequential Circuit (Flip-Flop) and Combinational Circuit (Gates), with the help of these two elements, a digital designer can implement any circuit, i.e., adder, multiplier, counter, memories, and state machines. There are two commonly used variants of the RTL — namely: Before the RTL invention, engineers designed a complete functionality as a circuit — schematic entry. You could imagine if someone had to design a 32-bit adder, he had to design all the logic in gates, this made the design a cumbersome job with high level of errors. RTL design convert this self-designing job to an easy automated process, in which a designer can write functionality of the design in the language of his choice, and a tool convert all of his design into the equivalent combinational and/or sequential circuit. Figure 1: Code Snippet for D Flip-Flop Figure 1 shows the code for the single-bit flip flop and one-bit inverter. An RTL synthesizer tool can easily convert the above code into the following one-bit D Flip Flop. Figure 2: Alternative logic ...