pef82902 Infineon Technologies Corporation, pef82902 Datasheet - Page 114

• Manufacturer Part Number: pef82902
• Description: 4b3t Second Generation Modular Isdn Nt Intelligent Extended
• Manufacturer: Infineon Technologies Corporation

PEF 81902
Functional Description
Possible Error Conditions during Reception of Frames
If parts of a frame get lost because the receive FIFO is full, the Receive Data Overflow
(RDO) byte in the RSTA byte will be set. If a complete frame is lost, i.e. if the FIFO is full
when a new frame is received, the receiver will assert a Receive Frame Overflow (RFO)
interrupt.
The microcontroller sees a cyclic buffer, i.e. if it tries to read more data than available, it
reads the same data again and again. On the other hand, if it does not read or does not
want to read all data, they are deleted anyway after the RMC command.
If the microcontroller tries to read data without a prior RME or RPF interrupt, the content
of the RFIFO would not be corrupted, but new data is only transferred to the host as long
as new valid data is available in the RFIFO, otherwise the last data is read again and
again.
The general procedures for a data reception sequence are outlined in the flow diagram
in
Figure
44.
Data Sheet
100
2001-11-12