peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 69

• Manufacturer Part Number: peb20560
• Description: Dsp Oriented Pbx Controller Doc
• Manufacturer: Infineon Technologies Corporation

Depending on the number of bytes to be stored in the RFIFO the following behavior
occurs:
Table 2-9
RFIFO Handling/Steps
Receive frame
After 32 bytes are
received
After next 31/32 bytes are
received
Additional I-poll
Additional RR-poll
Read and acknowledge
RFIFO
Read and acknowledge
RFIFO
Read and acknowledge
RFIFO
Multiple shorter frames results in the same behavior, e.g.
frame 1:
frame 2 −n:
Semiconductor Group
1-31 bytes
total of 31 bytes including receive status bytes for frame 2 −(n −1)
cause the case 1.
Case 1
Total frame length:
63 data bytes
A RPF-interrupt is issued, the RFIFO is not acknowledged
Control response,
no overflow
indication
RFO-interrupt, I-response with overflow indication or I-data
if stored in XFIFO as prepared data
RFO-interrupt, RR-response or I-data if stored in XFIFO as
direct data
RME-interrupt
RDO-bit is not set,
frame is complete
2-23
Case 2
Total frame length:
64 data bytes
Control response
with overflow
indication
RPF-interrupt
RME-interrupt
RDO-bit is set,
frame is
complete but
indicated as
incomplete
Functional Block Description
Case 3
Total frame length:
65 data bytes or
more
Control response
with overflow
indication
RPF-interrupt
RME-interrupt
RDO-bit is set,
frame is not
complete
PEB 20560
2003-08