fpga book

. The specific capacitance is best for the same noise compensation as the self-resonant frequency, and we measure this phase relationship with this frequency. When the disturbance zone to the distance of the capacitance, the phase of the compensation current and the noise source phase is exactly the same as 180°, that is, the full reverse phase, when the compensation current is no longer in effect, the decoupling effect is invalid, the compensated energy can not be delivered in time, in order to

Differential Impedance correlation parametersThe spacing is 6mil, the thickness of the line width is 15mil,core layer is 12.6mil, the calculated result is 89.72ω, satisfies within the 90ω±10% range.Once the above parameters have been calculated, the wiring must be started, then the differential pair should be set in the schematic diagram. As shown in 25.13. It is defined by choosing place---directives---differential pair in the menu bar, and also note that the names need to be defined as *_n an

order to make the decimal point of the result not move.The multiplication of a fixed-point decimal with the C language is:Short q1,q2,q3;....Q3= ((Long Q1) * (Long Q2)) >> N;Because/2^n and * 2^n can be easily computed with a shift, a fixed-point decimal operation is much faster than a floating-point decimal. Let's use an example to verify the above formula:Use Q12 to calculate 2.1 * 2.2, first convert 2.1 2.2 to Q12 fixed-point decimal:2.1 * 2^12 = 8601.6 = 86022.2 * 2^12 = 9011.2 = 9011(8602

Ic_vector (Downto 0) 34 ); 0 END component;36 COMPONENT led37 PORT (data:in std_logic_vector (Downto); 39 Led_seg:out Std_logic_vector (7 Downto 0); END component;42 Signal Clka:std_log IC;44 Signal Addr:std_logic_vector (9 Downto 0); signal Data:std_logic_vector (Downto 0); BEGIN48 U1:clock_gen Port Map (Clk,rst,clka), U2:phase_adder port map (clka,rst,f_ LEVEL,ADDR), U3:rom port map (clka,addr,data), u4:led port map (data, LED_SEG); behavioral end;3. Pin definition1 net "CLK"

Ic_vector (Downto 0) 34 ); 0 END component;36 COMPONENT led37 PORT (data:in std_logic_vector (Downto); 39 Led_seg:out Std_logic_vector (7 Downto 0); END component;42 Signal Clka:std_log IC;44 Signal Addr:std_logic_vector (9 Downto 0); signal Data:std_logic_vector (Downto 0); BEGIN48 U1:clock_gen Port Map (Clk,rst,clka), U2:phase_adder port map (clka,rst,f_ LEVEL,ADDR), U3:rom port map (clka,addr,data), u4:led port map (data, LED_SEG); behavioral end;3. Pin definition1 net "CLK"

[Serialization] FPGA OpenGL series instances Sequence Pulse Generator Based on OpenGL I. Principles In a digital circuit, a circuit that can output pulse waveforms in turn in a certain order of time is called a sequential pulse generator. In digital systems, it is often used to control certain devices to perform operations or operations in the order specified in advance.A sequence pulse generator is also called a pulse distributor or a beat puls

to allow the software to change the baud rate. If we select it, we will allow it, in this way, we can use the software to change the baud rate at any time. If the software is not set, the default value is 115200 set above. In the red box 3, we set some parameters related to the serial port and check the method, data bit, stop bit, which is basically not used later. You can modify it based on your actual situation. After setting, click Next and finish to complete the build. After the build,

I. The core Board uses a more advanced FPGAEp3c16q240With more resources and higher performance; Ii. Core Board4-layer PCBDesign, more stable, more professional! Can be used in industrial products; III,Wide power input (7.5v ~ 16 V) Design, Including anti-plug-in and anti-attack functions, and built-inThree-way switch power supply moduleMore environmentally friendly and energy-saving. It can be used not only as a Development Board, but also as a good design reference for industrial application

AbstractWeekly slave is used most of the time, so I usually feel better about slave. If component is deployed, when should the master be established and when should the slave be established ?. IntroductionIn Jay Kraut's Hardware Edge Detection Using an Altera Stratix niosii Development Kit, the following statement breaks through the master and slave. Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> The Masters initiate communication and the Sl

Http://www.cnblogs.com/fpga/archive/2009/10/24/1589318.htmlThe duty ratio is 50% dividedEven frequency division is relatively simpleFor example, the N-frequency, then count to n/2-1, then the clock flipped, the code is as follows:1 module even (clk_in,clk_out,rst_n);2 input clk_in;3 input rst_n;4 output clk_out;56 parameter n=6;78 reg [3:0] CNT;9 Reg Clk_out;10Always @ (Posedge clk_in or Negedge rst_n) beginif (!rst_n) beginCntclk_outEnd+ Else if (cnt

Modelsim with a reg type, such as CLK is input,The above Modelsim is used in the output of the reg,.v file, that is, outputs, in the Modelsim is a wire, this should bear in mind//---------------------------------------------------------Description of each module-------------------------Led_source#(. Led_width (4))I1 (Port map-connection between master ports and Signals/registers. CLK (CLK),. Cnt1 (Cnt1),. Flag_cnt1 (Flag_cnt1),. Led_out (Led_out),. Led_out_cnt1 (Led_out_cnt1),. Rst_n (Rst_n));T

The PLL is actually a negative feedback system that synchronizes the clock on the circuit with the phase of an external clock The PLL phase-locked loop has three components:Phase detector PD, loop filter lf and voltage controlled oscillator VCO Principle: The external input reference signal is used to control the frequency and phase of the internal oscillation signal in the loop.PD, which detects the phase difference between the input signal and the output signalLF, the converted volta

operand is negative, the remainder is positive, that is, B%a,bThen what will the result be? The simulation results with Modelsim are as follows:You can see that the symbol of quotient and remainder is the same as the symbol of the number of remainders.4. The operation symbol of power is * *, while the operation symbol of ^ refers to bitwise XOR or Attribution .^ Bitwise XOR: Two Yuan Xor, there are two operands located on both sides. If a bit is x or Z, the bit result is x, otherwise the same i

1.Location Constraint for assigning I/O portsNET Example:NET My_io loc=r7;2.IOSTANDARD Attribute for selecting IO standards such as LVCMOS25,LVDS_25, etc.NET 3.Output Slew Rate AttributecNET Slew_value can SLOW (Default) FAST Quietio4.Output Drive Strength Attribute driving capacity (MA)NET Drive_value can 2 4 6 8 (Default) 16 245.pullup/pulldown/keeper for Ibuf, Obuft, and IOBUFNET Spartan-6 FPGA SelectIO Resources User Guide notes 2 SelectIO attribu

1, kneeling ask the program compiled by VHDL How to generate after the compilation. The schematic diagram of the BDF format EDA design has many modules how to integrate each module to imitateQuartus II in the file directory creat/update, and then creat symbol files for the current file can generate the module, and then create a new BDF file, double-click the space, will jump out of the dialog box, add the module you want.EDA Design has many modules how to integrate each module to imitate? This p

The reset circuit is very important to both FPGA and ASIC, because a poor reset circuit may lead to non-repeated faults. 1. Problems Caused by full Asynchronous Reset Full Asynchronous Reset is asynchronous when it is established and released, which may bring the system into quasi-steady state. 2. Full synchronization Reset 3 asynchronous establishment and synchronous release of the circuit will provide more reliable reset than the fully syn

As117 provides 1A Linear Power Supply: 144 pin, less than 50 thousand doors As2839 and lt1085/6 provide 3A Linear Power Supply: 240 pin, 0.3 million logic gate or lower Tps54350 provides 3A Current Switching Power Supply: Suitable for most needs Reset is generally a low-level reset (except for some), chip reset (max708s/70￥ ￥1.6 series, high and low level 2 reset mode, with power monitoring capabilities. Ipm811 ￥0.8 low-level reset small volume) and resistance Reset

that the configuration of the worker in the FPGA builder is problematic, and the hardware won't be successful. Step 2:Change the specified function to hardwareNow we want to use the hardware interface line of the sum_elements () function. The following example selects accelerate with the nio ii c2h compiler for sum_elements. After the selection, there will be more c2h settings below. Select "build software and generate system" and "use hardware

From FPGA/CPLD Application Design Example 1 Use lowercase letters for all signal names, variable names, and port names, and uppercase letters for constant names and user-defined types. Use meaningful signal name, variable name, Port name, and parameter name. The signal name length should not be too long, and strive to be concise and clear. Use CLK as the prefix of the signal name or signal name for the clock signal (when multiple clocks e

1 Decision Tree The IF else statement and case are used in FPGA. A) if else is privileged, similar to priority encoding (when the two conditions are both true, only the first condition is true). Therefore, the IF else structure should be used when there are privileged conditions, the privileged order of parallel if condition statements is exactly the same as that of if else. B) case statements are often (not always) used in conditions where all con