ATM CELL PHYSICAL LAYER HANDLING CIRCUIT BASED ON STM

摘要

The present invention discloses a processing circuit for STM-based ATM (Asynchronous Transfer Mode) cell physical layer. In the present invention are disclosed a general circuit structure having a multiplex, demultiplex unit between a byte processing unit and a parallel processing unit, a real-time transform method between 16 bit UTOPIA format and a standard ATM cell format in a ATM cell processing unit, and a control circuit which is normally in 9x270 mode and drives all the circuit in 9x30 mode in a special test mode.