qr code reader camera c# Figure 9-9 Smaller but Slower 8-Bit Ripple Carry Adder in C#.NET

Recognize QR Code in C#.NET Figure 9-9 Smaller but Slower 8-Bit Ripple Carry Adder

Figure 9-9 Smaller but Slower 8-Bit Ripple Carry Adder
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Figure 9-10 Bigger but Faster 8-Bit Lookahead Adder
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In most synthesis tools, the designer has control over which type of adder is selected through the use of constraints If the designer wants to constrain the design to a very small area and doesn t need the fastest possible speed, then the ripple carry adder probably works If the designer wants the design to be as fast as possible and doesn t care as much about how big the design gets, then the lookahead adder is the one to select The mapping process takes as input the optimized boolean description, the technology library, and the user constraints, and generates an optimized netlist built entirely from cells in the technology library During the mapping process, cells are inserted that implement the boolean function from the optimized boolean description These cells are then locally optimized to meet speed and area requirements As a final step, the synthesis tool has to make sure that the output does not violate any of the rules of the technology being used to implement the design, such as the maximum number of fanouts a particular cell can have
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SUMMARY
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In this chapter, we discussed some of the basic principles of the synthesis process In the next chapter, we take a closer look at how to write models that can be synthesized
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CHAPTER
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VHDL Synthesis
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In this chapter, we focus on how to write VHDL that can be read by synthesis tools We start out with some simple combinational logic examples, move on to some sequential models, and end the chapter with a state machine description All of the examples are synthesized with the Exemplar Logic Leonardo synthesis environment The technology library used is an example library from Exemplar Logic All of the output data should be treated as purely sample outputs and not representative of how well the Exemplar Logic tools work with real design data and real constraints
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Ten
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Simple Gate Concurrent Assignment
The first example is a simple description for a 3-input OR gate:
LIBRARY IEEE; USE IEEEstd_logic_1164ALL; ENTITY or3 IS PORT (a, b, c : IN std_logic; PORT (d : OUT std_logic); END or3; ARCHITECTURE synth OF or3 IS BEGIN d <= a OR b OR c; END synth;
This model uses a simple concurrent assignment statement to describe the functionality of the OR gate The model specifies the functionality required for this entity, but not the implementation The synthesis tool can choose to implement this functionality in a number of ways, depending on the cells available in the technology library and the constraints on the model For instance, the most obvious implementation is shown in Figure 10-1 This implementation uses a 3-input OR gate to implement the functionality specified in the concurrent signal assignment statement contained in architecture synth What if the technology library did not contain a 3-input OR device Two other possible implementations are shown in Figures 10-2 and 10-3 The first implementation uses a 3-input NOR gate followed by an inverter The synthesis tool may choose this implementation if there are no 3-input OR devices in the technology library Alternatively, if there are no 3input devices, or if the 3-input devices violate a speed constraint, the
Figure 10-1 Model Implementation
in [1] out in [0] d
in [0] out in [1]
VHDL Synthesis
INBUF
b PAD INBUF c PAD INBUF a PAD Y Y Y A B C NANDOC Y D OUTBUF PAD d
Figure 10-2 3-Input OR
3-input OR function could be built from four devices, as shown in Figure 10-3 Given a technology library of parts, the functionality desired, and design constraints, the synthesis tool is free to choose among any of the implementations that satisfy all the requirements of a design, if such a design exists There are lots of cases where the technology or constraints are such that no design can meet all of the design requirements
IF Control Flow Statements
In the next example, control flow statements such as IF THEN ELSE are used to demonstrate how synthesis from a higher level description is accomplished This example forms the control logic for a household alarm system It uses sensor input from a number of sensors to determine whether or not to trigger different types of alarms Following is the input description:
LIBRARY IEEE; USE IEEEstd_logic_1164ALL; ENTITY alarm_cntrl IS PORT( smoke, front_door, back_door, side_door, PORT( alarm_disable, main_disable, PORT( water_detect : IN std_logic; PORT( fire_alarm, burg_alarm, PORT( water_alarm : OUT std_logic); END alarm_cntrl; ARCHITECTURE synth OF alarm_cntrl IS BEGIN PROCESS(smoke, front_door, back_door, side_door, PROCESS(alarm_disable, main_disable, PROCESS(water_detect) BEGIN
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