Korea Telecommunication Authority

Si Joong Kim

Jong Seog Koh

Kyeoun Soo Kim

Jae Dong Kim

A data transmission circuit includes a cyclic check (CRC) circuit which improves operation speed of the overall system by checking errors for safe data transmission and a data rate control circuit of which the rate control portion required for data interface includes two simple counter logics to control the data rate during data interface.

Data transmission circuit having cyclic redundancy check circuit and data rate control circuit

A zig-zag and alternate scan conversion circuit for encoding/decoding videos which is structured only by logic circuits using a regularity of scan address patterns, thereby achieving an improvement in processing speed and a reduction in area. The circuit includes a zig-zag and alternate scan address generating unit for receiving a start signal, a basic operation clock signal, and a control signal indicative of whether the scan pattern of input data is a zig-zag scan pattern or an alternate scan pattern, and executing an operation for writing the input data on a RAM and reading them from the RAM based on the received signals, a raster address generating unit for receiving the same signals as those received in the zig-zag and alternate scan address generating unit and executing a writing/reading operation of the input data, a pair of multiplexor units each for appropriately selecting an address signal from the address generating units; and a latch unit for outputting address signals selected from the multiplexor units while controlling the timing of the address signals. The circuit can be applied to systems requiring high-speed data processing such as B-ISDN terminals and high definition televisions. The circuit can also be easily used in systems including circuits designed in the form of a VLSI which will be used as an application-specific integrated circuit (ASIC).

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Taejeon, South Korea

Si Joong Kim