PEB3086 Infineon Technologies, PEB3086 Datasheet - Page 141

• Manufacturer Part Number: PEB3086
• Description: ISDN Subscriber Access Controller
• Manufacturer: Infineon Technologies

ISAC-SX
PEB 3086
Description of Functional Blocks
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 RSTAx 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 doesn’t read or doesn’t
want to read all data, they are deleted anyway after the RMC command.
If the microcontroller reads data without a prior RME or RPF interrupt, the content of the
RFIFOx would not be corrupted, but new data is only transferred to the host as long as
new valid data is available in the RFIFOx, 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
73.
Data Sheet
141
2003-01-30