Abstract:
PURPOSE: A method and device for managing a contents addressable memory lookup table based on an LPM(Longest Prefix Matching) being used in an IPv4 is provided to reduce data updating time generally by locating an empty area between an area the prefix length thereof is 23-bit and 24-bit instead of the prefix length of '0' or '32' in a lookup table of an IPv4. CONSTITUTION: A pointer storage(510) stores sixty six pointers. A table managing unit(530) interfaces with a CPU(520) and controls pointers and a CAM(Contents Addressable Memory) control unit(550). The CAM control unit(550) interfaces with the table managing unit(530) and the pointer storage(510), and controls a CAM table storage(540). The table managing unit(530) receives a data appending command from the CPU(520), controls a pointer stored in the pointer storage(510), operates the CAM control unit(550), and updates the CAM table storage(540). The pointer storage(510) stores a pointer having position data of a CAM table, and stores two pairs of upper pointer and lower pointer the prefix lengths. The CAM control unit(550) receives a control command from the table managing unit(530) and the pointer storage(510), operates a CAM, and executes a retrieving command, a reading command, and a writing command.
Abstract:
PURPOSE: The adaptive equalizing device of a frequency area is provided to selectively receive channels so as to remove interference, and to selectively add interference-removed signals so as to decide a symbol value, so that a duplicated variable related to the modulation/demodulation of a DWMT(Discrete Wavelet Multi Tone) can be appropriately supplied and a channel characteristic can be improved. CONSTITUTION: A receiving controller(310) selectively receives channels(1-n) and delivers a filtered symbol to a filter of a next terminal, according to a channel selection signal delivered from external. Filters(321-32n) filter signals delivered from the receiving controller(310) to remove an interference. An output controller(330) selectively adds signals filtered by the filters(321-32n) for outputting, according to an output control signal delivered from external. A symbol value decider(340) compares a preset reference value with an output signal of the output controller(330), to decide a symbol value of a signal output from the output controller(330) according to a compared result. A subtracter(350) subtracts an output signal of the output controller(330) from the symbol value decided by the symbol value decider(340). And an update unit(361-36n) compares a signal received through the receiving controller(310) with an error detected by the subtracter(350), to update a filtering coefficient of the filters(321-32n) according to a compared result.
Abstract:
PURPOSE: A frame synchronization apparatus is provided to reduce the amount of a memory used by storing/circulating synchronization protection information such as detection state of a synchronization pattern of m(m is a natural number) bit, that is a synchronization pattern detection number state, etc. CONSTITUTION: A frame synchronization apparatus includes an 1 bit m-stage shift register(31) for shifting a signal series having a concentration synchronization pattern of m bits among N bits from the outside. A m-bit concentration synchronization pattern detection circuit(32) detects a m-bit concentration pattern using an output signal of 5 bit of the shift register(31). A memory(34) constitutes an N stage shift register having bits more than log2A of 1 word for storing the synchronization protection information of the frame every N bit period. A logic circuit(33) generates a frame synchronization protection information to be newly written into the memory(34) depending on the detection output from the frame synchronization protection information before one period read from the memory(34) and the m-bit concentration synchronization pattern detection circuit(32) to perform a write for the memory(34) and then outputs the detection result to the outside.
Abstract:
본 발명은 데이터 저장 장치에 관한 것으로서, 특히 데이터 변환 속도 및 전송 속도를 일정하게 하는 데이터 저장 장치에 관한 것이다. 종래 데이터 저장 장치는 입력 데이터에 대응하는 변환 데이터의 발생량의 편차에 의해, 출력 데이터가 입력 데이터의 전송 속도보다 더 빠른 경우에는 저장 수단에 언더플로우가 생기는 결점이 발생하였다. 따라서 본 발명은 저장부의 변환 데이터의 발생량이 작은 경우, 저장 수단에 데이터가 가득 차지 않아도 출력부에 전송되도록 제어함으로서, 데이터 발생량에 편차가 있는 경우에도 저장 수단에 언더플로우가 생기지 않도록 하는 데이터 저장 장치를 제시한 것이다.
Abstract:
1. 청구범위에 기재된 발명이 속하는 기술분야 본 발명은 심볼을 복원하는 수신 시스템의 스타트-업 장치 및 방법에 관한 것임. 2. 발명이 해결하고자하는 기술적 요지 본 발명은 수신부를 초기화시키는 과정을 3단계로 구분하므로써, 정수값 심볼을 효과적으로 구현하여 잡음 섞인 심볼을 보상하는 기능부의 수렴성을 보장할 수 있는 스타트-업 장치 및 방법을 제공하는데 그 목적이 있다. 3. 발명의 해결 방법의 요지 본발명은 전달된 잡음이 섞인 심볼의 수를 검출하여 제어신호를 출력하는 검출 수단; 상기 제어신호에 따라 의사 잡음 심볼를 출력하는 의사 잡음 심볼 발생수단; 외부로부터 전달된 상기 심볼들에 섞인 잡음을 보상하는 적응 등화수단; 및 상기 심볼값을 입력받아 정수값 심볼들을 출력하는 심볼 결정수단; 상기 정수값 심볼을 디코딩하여 소정 진수 데이터를 출력하는 디코딩 수단을 포함한다. 4. 발명의 중요한 용도 본 발명은 초고속 송수신 시스템에서 수신부를 초기화시키는 기술에 관한 것임.
Abstract:
The apparatus includes a re-timing means (1) for re-timing inputted NRZ data bit series. A space bit generating and delaying means (2) synthesizes inputted space bits and transmission clocks, and delays them. An alternate mark bit generating means (3) synthesizes the mark bits of the NRZ data bit series and clock pulses, and divides them into two frequencies to an alternate form. A CMI code generating means (4) receives the outputs of the delaying means (2) and the alternate conversion mark bit generating means (3) to convert the NRZ data to CMI codes. With the apparatus, the variation width of the pulses is reduced, resulting in that errors are reduced.