Abstract:
A single port memory control apparatus for bi-directional data communication and a control method thereof are provided to reduce the number of RAM for buffering data by performing reading/writing transmission/receiving data from a memory composed of an external synchronous signal port RAM. A single port memory control apparatus for bidirectional data communication includes a transmission control unit(120), a receiving control unit(110), a mediation control unit(103), and a mode selection unit(104). The transmission control unit(120) generates read/write signals for a transmission packet frame by using write/read enable-signals and write data of the transmission packet frame generated in a transmission terminal. The receiving control unit(110) generates read/write signals for a receiving packet frame by using the write/read enable-signals and write data of the receiving packet frame generated in a receiving terminal. The mediation control unit(103) mediates the reading/writing of a memory for the transmission/receiving packet frames which are inputted from the transmission control unit(120) and the receiving control unit(110) according to an operation mode. The mode selection unit(104) outputs an operation mode signal to the mediation control unit(103).
Abstract:
A digital AGC(Automatic Gain Control) method in a burst mode optical receiver and a device therefor are provided to generate a selective reset signal inside the optical receiver, thereby being suited to a small-sized chip and extending a loud/soft ratio and the dynamic range of an input signal even as maintaining a fast response. When a burst is initiated, the bottom level of an outputted voltage signal is detected. A reset signal is generated based on a reference voltage generated according to an output signal of a trans-impedance amplifier(102). The detected bottom level is compared with the input signal. According to the compared results, an AGC signal is generated to control gain of the trans-impedance amplifier(102).
Abstract translation:提供了一种突发模式光接收机及其装置中的数字AGC(Automatic Gain Control,自动增益控制)方法,用于在光接收机内部产生选择性复位信号,从而适合于小尺寸芯片并延伸大/软比率, 输入信号的动态范围即使保持快速响应。 当突发启动时,检测输出电压信号的底部电平。 基于根据跨阻放大器(102)的输出信号生成的参考电压产生复位信号。 将检测到的底层电平与输入信号进行比较。 根据比较结果,产生AGC信号以控制跨阻放大器(102)的增益。
Abstract:
본 발명은, 비동기전송모드(ATM) 계층을 통하여 에이티엠적응계층1에서의 T1/E1 등의 전용선(leased line) 데이터를 구조화하기 위한 구조경계를 식별할 수 있는 포인터의 생성장치 및 그 방법에 관한 것으로, 그 구성은 포인터 값 및 ATM 셀의 순서를 기억하기 위한 Pointer_P 값을 이용하여 다음 사이클 구조경계 값을 생성하는 다음 사이클 구조경계 생성수단; 상기 다음 사이클 구조경계 생성수단으로부터 입력된 다음 사이클 구조경계 값을 블록 사이즈 값으로 나눈 나머지 값을 계산하는 모듈로 계산수단; 상기 다음 사이클 구조경계 생성수단으로부터 입력된 다음 사이클 구조경계 값과 상기 모듈로 계산수단으로부터 입력된 나머지 값과 외부로부터 입력된 블록 사이즈 값을 이용해 현재 사이클의 구조경계 값을 생성하는 현재 사이클 구조경계 생성수단; 상기 현재 사이클 구조경계 생성수단으로부터 입력된 현재 사이클 구조경계 값에 따라 구조경계를 위한 포인터 값과 Pointer_P 값을 각각 생성하는 포인터 계산수단; 및 순서번호와 시작번호를 입력받아 상기 다음 사이클 구조경계 생성부 및 현재 사이클 구조경계 생성수단으로 인에이블 신호를 발생하는 제어신호 발생수단을 포함하는 것을 특징으로 한다.
Abstract:
PURPOSE: A device of compensating for characteristics of a laser diode and an optical transmitter comprising device thereof are provided to change a bias current of a laser diode according to a temperature change, and to regularly output an optical power of the laser diode. CONSTITUTION: An optical output detector(2) detects an optical power outputted from a laser diode(1), and converts the optical power into a voltage. A bias current controller(3) detects a maximum level of the voltage, and outputs the first control value corresponding to a difference between the maximum level and the first reference voltage. A modulation current controller(4) detects a minimal level of the voltage, and outputs the second control value corresponding to a difference between the minimal level and the second reference voltage. A laser diode driver(5) outputs a driving current in accordance with the first and second control values to the laser diode(1).
Abstract:
PURPOSE: A communication device for an EPON(Ethernet Passive Optical Network) is provided to support uplink/downlink priority-tagged frames, and to support a VLAN(Virtual LAN) multicast in a PON bridge function, thereby constructing a VLAN in the EPON as increasing link efficiency. CONSTITUTION: A PON bridge sub layer(100) comprises as follows. A reception output processor(101) reads data from a reception output queue(105), and changes 32-bit data into an 8-bit signal to transmit the data to a switch or NP(Network Processor)(10). If an overflow is generated in a transmission input queue(106), the reception output processor(101) receives a pause signal from the transmission input queue(106), and generates a pause frame to the switch or NP(10). If the overflow is not generated in the transmission input queue(106), the reception output processor(101) reads the frame, and transmits the frame to the switch or NP(10). The reception output processor(101) performs an FCS(Frame Check Sequence) generation process for the frame only when the pause frame is generated, and sends data to an SPI processor(105).