CIRCUIT FOR SEPARATING ASYNCHRONOUS TRANSFER MODE ADAPTATION LAYER DATA IN CONTROL STATION OF INTERNATIONAL MOBILE TELECOMMUNICATION-2000 NETWORK SYSTEM

摘要

PURPOSE: A circuit for separating asynchronous transfer mode(ATM) adaptation layer(AAL) data in a control station of an international mobile telecommunication(IMT)-2000 network system is provided to prevent buffer wastes by separating AAL2 data from AAL5 data according to AAL types in an output terminal, and to increase efficiency of the circuit by implementing field programmable gate arrays (FPGA) and an electronically programmable logic device(EPLD) without using a common chip to separate the AAL types. CONSTITUTION: A circuit for separating asynchronous transfer mode(ATM) adaptation layer(AAL) data in a control station of an international mobile telecommunication(IMT)-2000 network system, comprises a write selector(111), a read selector(112), a memory controller(113), and first/second buffers(114,115). The write selector receives the AAL data to output the data to the memory controller with write enable signals and write address signals. The write selector outputs a buffer write use selecting signal to the memory controller according to buffer use available signals. The read selector outputs a buffer read use selecting signal and a read enable signal to the memory controller, and receives the AAL data, a read address signal, and an AAL type signal. The read selector outputs the AAL data by separating into AAL2 data from AAL5 data. The memory controller selects one of first/second buffers for storing the AAL data to output write enable signals, write address signals, and the AAL data, and selects one of first/the second buffers for reading the AAL data. The memory controller outputs real enable signals and read address signals to receive the AAL data, and decides data forms of the AAL data, then outputs the AAL data to the real selector. The first/the second buffers stores the AAL data in addresses and outputs the AAL data to the memory controller by reading the AAL data stored in the addresses.