dmm delay

Http://www.cnblogs.com/pengkunfan/p/3746635.html DM8168 Dmm/tiler Introduction 1. Overview As figure 4-1,dmm positioned at the front end of the SDRAM controller, it is the memory access interface generated by all initiator. Dynamic memory Manager DMM, is a specialized management module, broadly speaking, including all aspects of memory access. For example: Ini

Original: Http://wzw19191.blog.sohu.com/135110823.html The concept of propagation delay refers to the transmission of electromagnetic signals or optical signals in the transmission medium delay, and in the optical fiber or copper wire, the optical signal and electromagnetic signal propagation speed of more than 200,000 km/s, in the transmission medium transmission is electromagnetic signal or optical signal

chips to FPGA by the system clock. Figure 1.3 FPGA data input model The input delay is the delay time from the external device to the FPGA input port. This includes the latency from the clock source to the FPGA, the latency from the external device, the TCO of data transmission from the external device, and the cabling latency on the PCB. As shown in Figure 1.4, It is the timing of the external device and

Transferred from: http://blog.sina.com.cn/s/blog_980e19e00101b5dh.htmlSometimes precise delay is required, such as the 18B20 temperature sensor is very strict in timing requirements and must be accurate to the microsecond levelFirst, with the NOP functionIn Keil C51, call the library function directly:#include//declared void _nop_ (void);_nop_ (); Produce a NOP instructionFunction: For the delay is very sho

The second way to address the CPU usage of the delay function in the previous section (up to 50%) is to use the message mechanism to wait for messages or timeouts through API functions MsgWaitForMultipleObjects, thus avoiding the use of cyclic detection to make CPU usage too high. The complete modified version of the delay function code is as follows:[Delphi]View Plaincopyprint? Procedure

See this topic you know what I'm going to say today is the PHP variable reference feature, but what about deferred assignment? This is mainly my recent optimization of some features of an idea, I think it is good, I intend to record it. Take a look at the following pseudo-code: This code someone would say why not use the table, because some business requirements without the efficiency of the table is 3 to 20 times times of the table///My project is basically this kind of writing, more than the

Two simple ways to delay ASP pages ASP delay of the first Copy Code code as follows: ' Setup the variables necessary to accomplish the task Dim Timerstart, Timerend, Timernow, timerwait ' How many seconds do your want them to wait ... timerwait = 5 ' Setup and start ' timers Timernow = Timer Timerstart = Timernow Timerend = Timerstart + timerwait ' Keep it in a loop for the

Delay loading of JavaScript code improves speed and delay of javascript Delay loading of js Code improves the speed. The specific content is as follows: If there is a large amount of javascript code in the webpage, it will greatly affect the webpage access speed. The following describes how to solve this problem. 1. Delayed loading of js files: You can use the ti

Ignored magic-delay value assignment for php reference (late data Delay Binding) and value assignment binding I am talking about the variable reference feature of php today, but what is the problem of delayed assignment? This is mainly an idea I have recently optimized some features. I think it is still good and I plan to record it. Look at the pseudocode below the example: // This code may be used to avoid

Calls to cpu_relex will be executed in a system-related manner. In many systems, it does not do anything at all. This method should be explicitly avoided. For the arm system: # Define cpu_relax () barrier () That is to say, running a busy wait on ARM is equivalent: While (time_before (jiffies, J1 )); This busy Wait seriously reduces system performance. If the kernel is not configured as preemptible, this loop completely locks the processor during the

1, in the latest version of the beauty camera, the interface we click on the "Self-portrait" mode; 2, then in the open into the interface to click the "Settings" icon, as shown in the screenshot below; 3, in the setting has "delay" option, is currently closed, click on it can be opened, point once, is a delay of 3 seconds, point two times is the delay