qr code reader camera c# Figure 9-6 Register and Cloud Diagram with Attributes in C#

Scanning QR Code in C# Figure 9-6 Register and Cloud Diagram with Attributes

Figure 9-6 Register and Cloud Diagram with Attributes
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drive Register Datain load
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Each output can specify a drive capability that determines how many loads can be driven within a particular time Each input can have a load value specified that determines how much it will slow a particular driver Signals that are arriving later than the clock can have an attribute that specifies this fact The Load attribute specifies how much capacitive load exists on a particular output signal This load value is specified in the units of the technology library in terms of pico-farads, or standard loads, and so on For instance, the timing analyzer calculates a long delay for a weak driver and a large capacitive load, and a short delay for a strong driver and a small load An example of a load specification in Leonardo synthesis format is shown here:
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set_attribute -port xbus -name input_load -value 5
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This attribute specifies that signal xbus will load the driver of this signal with 5 library units of load
Drive
The Drive attribute specifies the resistance of the driver, which controls how much current it can source This attribute also is specified in the units of the technology library The larger a driver is the faster a particular path will be, but a larger driver takes more area, so the designer needs to trade off speed and area for the best possible implementation An example of a drive specification in Leonardo synthesis format is shown here:
set_attribute -port ybus -name output_drive -value 27
This attribute specifies that signal ybus has 27 library units of drive capability
Arrival Time
Some synthesis tools (such as Exemplar Logic Leonardo) use a static timing analyzer during the synthesis process to check that the logic being created matches the timing constraints the user has specified Setting the arrival time on a particular node specifies to the static timing analyzer
Synthesis
when a particular signal will occur at a node This is especially important for late arriving signals Late arriving signals drive inputs to the current block at a later time, but the results of the current block still must meet its own timing constraints on its outputs Therefore, the path to the output of the late arriving input must be faster than any other inputs, or the timing constraints of the current block cannot be met
Technology Libraries
Technology libraries hold all of the information necessary for a synthesis tool to create a netlist for a design based on the desired logical behavior, and constraints on the design Technology libraries contain all of the information that allows the synthesis process to make the correct choices to build a design Technology libraries contain not only the logical function of an ASIC cell, but the area of the cell, the input to output timing of the cell, any constraints on fanout of the cell, and the timing checks that are required for the cell Other information stored in the technology library may be the graphical symbol of the cell for use in schematics Following is an example technology library description of a 2-input AND gate written in Synopsys lib format:
library (xyz) { cell (and2) { area : 5; pin (a1, a2) { direction : input; capacitance : 1; } pin (o1) { direction : output; function : a1 * a2 ; timing () { intrinsic_rise : 037; intrinsic_fall : 056; rise_resistance : 01234; fall_resistance : 04567; related_pin : a1 a2 ; } } } }
This technology library describes a library named xyz with one library cell contained in it The cell is named and2 and has two input pins a1 and
Nine
a2 and one output pin o1 The cell requires 5 units of area, and the input
pins have 1 unit of loading capacitance to the driver driving them The intrinsic rise and fall delays listed with pin o1 specify the delay to the output with no loading The timing analyzer uses the intrinsic delays plus the rise and fall resistance with the output loading to calculate the delay through a particular gate Notice that the function of pin o1 is listed as the AND of pins a1 and a2 Also, notice that pin o1 is related to pins a1 and a2 in that the timing delay through the device is calculated from pins a1 and a2 to pin o1 Most synthesis tools have fairly complicated delay models to calculate timing through an ASIC cell These models include not only intrinsic rise and fall time, but output loading, input slope delay, and estimated wire delay A diagram illustrating this is shown in Figure 9-7 The total delay from gate A1 to gate C1 is:
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