between the bus and the device using two wires (SDA and SCL), serial communication between the microcontroller and external devices, or bidirectional data transmission between the master device and the slave device. The two passthrough wires are pulled up to + 5 V. Each Integrated Circuit in the control system can read each line through a CMOS Buffer, or the level of each line can be pulled down through a gate open-circuit FET tube. Therefore, for ea
by typical voltages: 5 V series (5 v ttl and 5 v cmos), 3.3v series, 2.5v series, and 1.8v series.· 5 v ttl and 5 v cmos logical levels are common logical levels.· 3. logical levels of 3 V and below are called low-voltage logical levels, which are commonly used as lvttl levels.· The logical levels of low voltage include 2.5v and 1.8v.· ECL/PECL and LVDS are differential input and output.· RS-422/485 and RS-232 are serial port interface standard, RS-422/485 is differential input output, RS-232 i
connected to the circuit), then, there is no electricity storage power out, the circuit it is connected will not work, And the capacitance of the electricity was put out, and the electrical circuit that connected it was triggered by the electric power put on it, and the circuit began to work .... Well, the program is eventually stored (or otherwise) in the computer, 1 means there is electricity, 0 means no electricity.The program has, there is no control of things, these capacitors are not able
Tomcat program run Java program, when exporting pictures, will appear in Chinese garbled, also to Tomcat Server.xml specified uriencoding= "UTF-8" parameter, also invalid.This is because Tomcat is requesting a system font when processing a program, so it must have a Chinese font in order to handle Chinese correctly.1. Under/usr/share/fonts/, create a new folder Winfonts, and then copy the Win7 font Msyh.ttf and Msyhbd.ttf to ubuntu/usr/share/fonts/.2. Install fonts# sudo chmod 664/usr/share/font
touched somewhere, there are sparks. In the power check on this motherboard, the power switch tube fdb7030l, Schottky diode 1n5817 breakdown damage was found. Motherboard repair in the motherboard power switch tube damage More, these switches are mostly FET, their parameters close, but many are SMD (surface mount).
To deal with this type of SMD pipe, if not, the following methods can be used: the ordinary TO220 package 60n06 with the SMD package Swi
This article has three parts: CPU Main power supply circuit composition, CPU single-phase power supply circuit Working principle (take HIP6021 power IC as an example), the CPU single-phase power supply Circuit maintenance flow detailed explanation. Thank the Shenzhen Red Police computer maintenance Training School to provide technical information to support this article.
General composition of power supply circuit
CPU main power supply is an important condition of CPU work, mostly by power sup
semiconductor diodes, transistors, FET, integrated circuits and other commonly used devices features and functions have a certain understanding, can identify different electronic components. In addition, the basic knowledge of analog/digital circuits should also be mastered. Understand the characteristics of circuit signals, applications, with the basic knowledge of the circuit reading skills.
Learn the basic maintenance methods of computer motherbo
CREATE PROCEDURE [owner.] stored procedure name [; program number] [Parameter # #,... Parameter #1024] [with {recompile | encryption | recompile, encryption}] [the FOR replication] as program row where stored procedure name cannot be more than 128 words. Up to 1024 parameters per stored procedure (SQL Server 7.0 version above) parameters are used as follows: @ parameter name data type [varying] [= default] [output] before each parameter name, you must have an "@" symbol, and each stored procedur
used to drive the SCL line;
• Respond to the main device from the device
Both can transmit data, but the transmission is not initiated from the device and the transmission is controlled by the master device.
4. Rate
Normal Mode: 100kHz
Quick mode: 400kHz
High Speed mode: 3.4MHz
There is no need to use a high speed SCL to keep the SCL at 100k or below;
I. Agreement
1. Idle state
The SDA of the I2C bus and the SCL two signal lines are at the same time at high power, which is defined as the idle
Problem:The one-month cadence, when opening Allegro, suddenly made an error: Allegro was unable to start the program because SfsBase.dll was lost in the computer.Attempting to open the schematic also prompts for errors, prompting for the loss of another file Cdn_sfl401as.dll.
Workaround:1, QQ Group for help, most of the request to re-install cadence.I feel more strange, in the installation directory of Cadence search SfsBase.dll file found not lost.2, on-line search, said is the system environm
, mainly for the circuit of the switch off and pass. Because it has the function of complete circuit breaker or switch-on, it is widely used in switching circuit, and has the characteristics of fast switching speed and long life, and is widely used in power supply, voltage regulator circuit, driving circuit, oscillation circuit, power amplification circuit, pulse amplifying circuit and line output circuit. Switching transistor due to the different power can be divided into small power switch and
---============== view the capacity size of a database table ========start================================?============create table # Tablespaceinfo--Create a result store table (Nameinfo NVarchar (), Rowsinfo int, Reserved NVarchar (20), Datainfo NVarchar Index_size NVarchar (), Unused NVarchar () Declare @TableName NVarchar (255)--table name Declare @CmdSql NVarchar (+) Decl is Info_cursor Cursor forselect o.name from dbo.sysobjects o Where objectproperty (o.id, N ' istable ') = 1 and O.name
You can create SQL statements directly:CREATE TABLE qresults (tname nvarchar (370), CNAME nvarchar (3630), [count] int) declare @tname nvarchar ($) DECLARE @cname n varchar (declare) @countOut nvarchar ($) Declare @sql nvarchar (max) DECLARE c_search cursor Forselect t.name,c.name From sysobjects t inner join syscolumns C on t.id=c.id where t.type= ' U ' and C.xtype in (56,167,175,231,239) Order by T.nam E--xtype This place limits the type int varchar char nvarchar nchar Five types open c_search
recovery systems. Although some people have proposed ways to increase SFP signal strength physically, use the SAN over SONET (SDH) method to enhance Remote Disaster Tolerance over 100 kilometers) Data Transmission Performance, however, this further increases the deployment cost of the disaster recovery solution. In a remote disaster recovery system, data transmission over the IP protocol is the cheapest data transmission method. This technology can a
24-port full-Gigabit Switch forwarding performance and line-end congestion tests. The current 24-port full-Gigabit Switch market is in great competition, some may not know the forwarding Performance Test and line congestion test of 24 full gigabit switches. After reading the following articles, you will become an expert.
2-layer Competition
Layer 2 performance tests include forwarding performance, port congestion control, address learning rate, Address Table depth, error frame Filtering, broadca
, all functional modules (such as the super engine module, IP voice module, extended service module, network monitoring module, and security service module) need to occupy one slot, therefore, the number of slots fundamentally determines the scalability of the switch.
2. module type. Undoubtedly, the more supported module types (such as LAN interface module, WAN interface module, ATM interface module, and extended function module), the more scalable the switch. Taking LAN interface module as an
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