PSF21150 INFINEON [Infineon Technologies AG], PSF21150 Datasheet - Page 148

• Manufacturer Part Number: PSF21150
• Description: IPAC-X ISDN PC ADAPTER CIRCUIT
• Manufacturer: INFINEON [Infineon Technologies AG]

PSB 21150
PSF 21150
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
79.
Data Sheet
148
2000-07-21