Device for segmentation and reassembly of asynchronous transfer mode and method for segmentation and reassembly

摘要

Segmentation and Reassembly (SAR) of the asynchronous transmission mode cell, and in particular, to prevent the bottlenecks that may occur during the disassembly and assembly of the asynchronous transmission mode cell in the device and method of the asynchronous transmission mode cell It is about. Such a device of asynchronous transmission mode cell accepts data at the same speed as the cell bus, detects valid data from the received data, and transmits the valid data to the memory unit, and temporarily stores valid data detected by the filter unit. A temp queue area, a pre-queue area which is stored until the data of which the cyclic redundancy check is completed in the packet unit among the data of the temp queue area, the pre-queue area that is currently used and the unused pre-queue area of the free queue area are left unused. A pre-queue list area indicating an area of the area; and a control information area storing information for storing the data of the temp queue area in an arbitrary area of the pre-queue area according to the type or header value of data temporarily stored in the temp queue area. A memory unit configured to determine a next operation of data stored in the temp queue area. A first header check unit, a final terminal unit for receiving data stored in the pre-queue area and transmitting the data to a second header check unit, a second header check unit for determining a next operation of the data transmitted from the final terminal unit; And a FIFO for outputting data transmitted from the second header checker through the cell bus.