pinout rj45

Now let's talk about the port remapping of the STM32 microcontroller, as it is an example of itself. Here is an example of the remapping of the USART1:Because I want a TFT_LCD screen of the main control board, taking into account the FSMC I chose the STM32F103VCT6 model of the CPU, accidentally connected to the serial port USART1. Because in the tuning process only found wrong, there is no way, can only be resolved by port remapping. But it didn't work. Port remapping , only the name, not the bo

test points, the relevant design requirements are as follows:(1) test points evenly distributed across the entire PCB, it is generally required that each network must have at least one Test probe to contact the testing point.(2) Priority of the test point selection: preferably a round pad, followed by the device pinout, the last hole is the most test point. SMD devices preferably using a circular pad to do test points, OSP processing process PCB shou

design. Gated clocks are typically generated by a counter divider. Use the clock resources provided by the FPGA as much as possible, using DCM as Deskew.Offset constraint not satisfiedThe first thing to do is to ensure that offset is written correctly.Then ensure that the input/output data into the FPGA in the register with a beat, the middle do not add the combination of logic. Register pack to IOB to ensure that the offset constraint is met to the maximum extent possible. (Similarly, as menti

, which takes less than 6 microseconds to wake the microcontroller from Stop mode. Memory and package options: 　 prior to the stm32f105 and STM32F107 Interconnect series microcontrollers, STMicroelectronics has launched the STM32 Basic series, enhanced series, USB basic series and enhanced series, and the new series is based on the 72MHz processing frequency of the enhanced series. Memory includes 64KB to 256KB Flash and 20KB to 64KB embedded SRAM. The new series is available in three packages o

syntax in the process management area to check whether there is a syntax error. 9. Double-click synthesize-XST to complete integration. 10. Select simulation in view, right-click the project management area, select new source, select maid, and enter file name 11, 12, 13. Enter the test code. In this example, it is in the red line area of the customer zone. Other examples are not required! 14. Right-click the simulate behavioral model and select Properties to set simulation parameters. 15

multimode.The difference between Singlemode and multimodeGeneral manufacturers will be in the color of the pull ring to distinguish, for example: Black pull ring for multimode, Wavelength is 850nm, blue is the wavelength of 1310nm module, yellow is the wavelength 1550nm module, purple is the wavelength 1490nm module.Optical Module ClassificationXFP Optical ModuleSelectable wavelength: 850NM,1310NM,1270NM,1330NM,CWDM,DWDMRate: 10GXFP (Gigabit Small Form Factor pluggable) is a hot-swappable optic

network. In addition, on this layer, you can support cables and optical cables depending on the type of cabling you are using ). Unshielded twisted pair UTP) copper cable can be used for different purposes, in general, it contains an eight-pin RJ45 interface. A normal Ethernet copper network cable can be used to transmit electrical signals from one end to the other. A direct connection network is used to connect a pc to A vswitch, as shown in Figure.

for the overall performance of the network cabling system. I believe that the advantages of dedicated jumpers mainly include the following advantages: First, the electrical performance of the dedicated jumper is higher than that of the manual production product. Dedicated jumpers and self-made Jumpers are used to test the same cat5e cabling link. Generally, the channel performance difference is about 30%. Secondly, the dedicated jumper adopts the multi-core wire core (usually 8 cores) and dedic

RS-232, RS-422 and RS-485 standards only to interface electrical characteristics to make provisions, and does not involve connectors, cables or protocols, on this basis, users can establish their own high-level communication protocols. The most frequently used plug-ins we encounter in our actual work have three DB9 DB25 RJ45 plug-ins. The above three plug-ins can be used as serial port plug-ins, you can also switch between sockets through cables. Nex

interface plug-in cable we use complies with the serial port standards, it can be used flexibly in practice, various protocols are used in serial port interface standards for communication and Device Control.We have learned about the serial port protocol. In our daily work, we are most exposed to the external interfaces of some actual devices. How can we know from the shape that this interface is? How to define each pin of cables? Above we know the serial RS-232, RS-422 and RS-485 standards onl

the near-point detection, which may not work far away, the final check shows that the electrical characteristics of the network cable do not meet the requirements. 6. RJ45 crystal leaders are not close Inferior RJ45 crystal head is mainly spring piece is not close, often happen not compacted, at that time is through, after a period of time again when the phenomenon of breaking.

, but in some of the network card location is more jincu, with this protective sleeve will not be plugged in the end, and some of the protective sleeve is more hard, but make the crystal head of the card buckle not to the end, so that contact is 5, cable quality does not pass At ordinary times we may not care about the quality of the network cable, generally we commonly used in the network cable is less than 10, so the impact of poor quality network cable is not obvious, but in the LAN cabling i

Protocol, so long as we use the interface plug-in cable to meet the standard of the actual use of flexible, in the serial port Interface standards using a variety of protocols for communication and equipment control. The above we understand the serial port protocol, and our daily work in contact with the most is the actual equipment of the external interface, how we know from the shape that it is that kind of interface. Make a definition of how the cables are each stitch. We know that. Serial

believes that the advantages of special jumpers mainly have the following advantages: First of all, the special jumper once the electrical performance is higher than the manual on-site production products. The same super five wiring link uses the special jumper and the self-made jumper test respectively, usually its channel performance difference is about 30%. Secondly, the special jumper adopts multi-core core (usually 8 cores) and proprietary core fixing process, the physical characteristics,

security for our home routers. Such as: Modify login username, password, WAP file encryption, etc., to avoid resources for other people to obtain, use. Landing "192.168.0.1" interface for a long time, 3-5 minutes, wireless network connection signal decline phenomenon, the signal fell to 11Mbps, exit and repair the connection, troubleshooting. in the overall ADSL with wireless router debugging process, small series also walked a lot of long way, mainly on the WAN Port's lack of awareness. Fi

HTPC and intelligent TV are selected HDMI to transmit signals, compared to the VGA interface, HDMI can simultaneously transmit video and audio signals, in the case of notebooks, in order to cater to the thin line, the introduction of MINIHDMI version, smaller volume at the same time the function will not be affected. Name: DP interface Features: Digital video output interface, used for multiple screen display. DP interface and mini DP interface DP interface is called DisplayPort

-pair wires. Commonly used twisted-pair lines have 3 types of lines and Super 5 type line. The 3 line can be used for telephone and 16Mbps data transmission, and the speed of Super 5 line transmission data can reach 100Mbps. In order to adapt to the requirements of future expansion and to maximize the protection of investment, this program uses all Super 5-class line mode. Work Area Subsystem To provide users with a IBDN standard, but also to meet the high speed data transmission standards. Th

BASE-T Fast Ethernet, RJ45 PCI Slots: 3 Console port: RJ-45 Device Update processing: Using only small File Transfer Protocol (TFTP) Failover port: DB-15 (RS 232) Restricting softwareThe PIX 525, which contains limited software licenses, provides entry-level enterprise security and performance. The 525-r includes 128MB of RAM and can use up to 6 10/100 Fast Ethernet interfaces. Unlimited softwarePIX 525, which contains unrestricted l

In the early SAN storage system, the data transfer between the server and the switch was done through optical fiber, because the server was transferring the SCSI instruction to the storage device, could not take the IP protocol of the ordinary LAN network, so it needed to use FC transport, so this SAN is called Fc-san, And later appeared with the IP protocol encapsulated SAN, can completely walk the ordinary LAN network, so called Ip-san, which is the most typical of the now popular iSCSI. Both

price is only 35 US dollars, which is greatly lower than the previous generation of products. 3. udoo Like Raspberry Pi, udoo is a Linux board with an ARM architecture, and a second ARM processor is installed on the board to simulate Arduino due. Udoo has dual-core and quad-core arm cortex-A9 CPUs, using the same arm sam3x processor as Arduino due. Udoo also has built-in OpenGL accelerators, 54-bit I/O, and analog input (pinout compatible with Ar