Phasen- und Ratenanpassungsschaltung für Zellenübertragung

摘要

In a cell transmission phase and rate converting circuit for use in an ATM communication system, an internal write-in pulse generator (41) generates an internal write-in pulse sequence (IWP) having a predetermined write-in period on the basis of each cell phase pulse of an external write-in pulse sequence (EWP) although any cell phase pulse of the external write-in pulse sequence (EWP) is not supplied thereto. An internal read-out pulse generator (51) generates an internal read-out pulse sequence (IRP) having a predetermined read-out period on the basis of each cell phase pulse of an external read-out pulse sequence (ERP) although any cell phase pulse of the external read-out pulse sequence (ERP) is not supplied thereto. A main control unit (12a) controls an FIFO buffer (11) to write a write-in cell data (WCD) into the FIFO buffer (11) as held cell data in response to a write-in clock signal (WCK) and the internal write-in pulse sequence (IWP) and to read the held cell data out of the FIFO buffer (11) as read-out cell data (RCD) in response to a read-out clock signal (RCK) and the internal read-out pulse sequence (IRP).