| 摘要 |
PURPOSE:To reduce the mount area by using a memory in common for incoming and outgoing signals. CONSTITUTION:An incoming direction ATM layer processing circuit 1 applies ATM layer processing to an incoming cell stream. An outgoing direction ATM layer processing circuit 2 applies ATM layer processing to an outgoing cell stream. A phase adjustment circuit 6 generates an outgoing SYNC signal whose phase is fixed based on an incoming SYNC signal and gives it to the outgoing direction ATM layer processing circuit 2. The outgoing cell stream is fed to the outgoing direction ATM layer processing circuit 2 synchronously with the generated synchronizing signal. A time division control circuit 7 applies time division control to the memory access when the incoming direction ATM layer processing circuit 1 and the outgoing direction ATM layer processing circuit 2 access a memory 5.
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