Abstract: based on the logic analysis of the kernel of the FPGA circuit debugging information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. With the FPGA into more and more ability, the need for effective debugging tools will become crucial. Careful planning in advance of internal visual abilities will enable YanZhiZu adopt correct debugging strategy, faster to complete their design task. I know that my set. More flow meter manufacturers choose model price quote you are welcome to inquire, here is based on the logic analysis of the kernel of the FPGA circuit debugging article details. With the FPGA into more and more ability, the need for effective debugging tools will become crucial. Careful planning in advance of internal visual abilities will enable YanZhiZu adopt correct debugging strategy, faster to complete their design task. “ I know there is a problem in my design, but I don't have the required internal visual ability to quickly find problems. ” Due to the lack of adequate internal visibility, debug the FPGA system may be thwarted. Use usually contains the FPGA, the larger of the whole system debugging visual ability become a big problem. For internal visibility, the design engineer must take some pins used in debug pins, and not the actual used in the design. What tools can be used for internal FPGA trace measurement? What technology available fixed pin number zui russsian internal visual ability? There are two kinds of the FPGA design engineer for internal trace measurement methods: 1. The node routing to pin, the use of the traditional external logic analyzer to test. 2. Insert a logic analyzer is the kernel into the FPGA design, through the JTAG save by internal FPGA memory trace capture routing output. FPGA logic analysis developers want to be in the early stage of the design to make important decision, they can determine how to consciously or unconsciously to debug their design. Get inside the FPGA visibility zui commonly used method is the use of logic analyzer, interested in the internal node routing to the analyzer to detect pins. This approach provides a deep memory trace in this problem causes and its influence may have a lot of time interval. Logic analyzers can measure may escape simulation asynchronous events. One example is the relative frequency of interaction of two or more clock domain. The logic analyzer provides powerful trigger for the measured results can establish time correlation with other system events. Traditional logic analyzer provides status and timing mode, so to capture data can be synchronous or asynchronous. In the timing mode, the design engineer can see the relationship between signal jump. In the state model, the design engineer has the ability to observe relative to the state of the bus. When the debug bus value crucial data path, the state pattern is particularly useful. Effective measure real world needs careful planning in advance. Using traditional logic analyzer to consider the main measure is to put the output node routing to detect pins. Traditional logic analyzer can only observe the signal routing to pin. Because I don't know the potential within the circuit of debugging problems, the design engineer can only put a few pins used for debugging. Such a little pin number may not be enough to provide enough visual ability, solve the problem at hand so as to delay the completion of this project. Maintain internal visual capabilities, as well as to reduce the number of dedicated to debug pins inserted in the design of a kind of method is in switch multiplexer ( See figure 1) 。 When in the FPGA design into the circuit, for example, may need to look inside the 128 nodes, which requires a tracking 32 channels. In this case, can be realized in the FPGA design multiplexer, routing of 32 nodes in a given time. For programming multiplexer, design engineers can download the new configuration file, use the JTAG or through the line of control on the multiplexer by routing switch signal. In the design phase, must carefully plan test multiplexer inserted. Otherwise the design engineer may stop node cannot be accessed at the same time need to debug. Figure 1: test multiplexer insert to make the design engineer has the ability to route a subset of internal signal diagram for Agilent16702B captured trace. Zui small debug dedicated pin number of the second kind of method is time division multiplexing ( TDM) 。 TDM multiplexing is often used to design the prototype, the chip FPGA as a single piece of ASIC prototype, which used for small zui debugging dedicated pin number. The technology zui internal circuit suitable for processing the slower. Assume that using 8-bit bus 50 MHZ design ( The clock is 20 ns) between along the Need visibility within the circuit. Use 100 MHZ sampling during * 10 ns low bit 4, during the second 10 ns high sampling four. With only four pins, so it can capture 20 ns in each cycle to all eight of the debugging information. After the capture of trace, combination of four capture can rebuild eight trace. TDM multiplexing also has some disadvantages.
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