Nokia Corporation

Nokia Mobile Phones Limited

Gregor Schneider

Daniel Bencak

Uwe Zwickler

A receiver for receiving packet data from a transmitter, the transmitter and the method of controlling transmission. The receiver may comprise first detection means for detecting that its memory has enough space to store a data packet and flow control signal means for providing a flow control signal, preferably a first flow control signal, to the transmitter in response to said first detection means. The receiver may comprise second detection means for detecting when a first portion of a packet has been received from the transmitter and flow control signal means for providing a second flow control signal to the transmitter in response to said second detection means. The transmitter may comprise third detection means for detecting the second flow control signal sent by the receiver and packetwise transmission means arranged, responsive to the third detection means, to complete transmission of a partially transmitted packet and then to stop transmission of further packets.

Asynchronous serial data interface

The description covers the identification of the position of data packets (P,, P,, . . . ) which are located in a serial received data stream and each have check data in a check field and a check sum (CRC) which is formed using the check data, the received data stream being passed in serial form through at least one comparison unit (,) which forms a new check sum (CRC&prime;) with each received signal to be newly added and compares this new check sum with data which are looked at for the associated received check sum (CRC), and, furthermore, during the comparison, the influence of all data is eliminated which do not belong to the check data and to the check sum (CRC).

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Bochum, Germany

Gregor Schneider