peb2255 Infineon Technologies Corporation, peb2255 Datasheet - Page 247

• Manufacturer Part Number: peb2255
• Description: E1/t1/j1 Framer And Line Interface Component For Long And Short Haul Applications
• Manufacturer: Infineon Technologies Corporation

Receive Signaling Status Register (Read)
RSIS relates to the last received HDLC frame; it is copied into RFIFO when end-of-frame
is recognized (last byte of each stored frame).
VFR…
RDO…
CRC16…
RAB…
Data Sheet
RSIS
VFR
7
Valid Frame
Determines whether a valid frame has been received.
An invalid frame is either
– a frame which is not an integer number of 8 bits (n
– a frame which is too short taking into account the operation mode
Note: Shorter frames are not reported.
A RFIFO data overflow has occurred during reception of the frame.
Additionally, an interrupt can be generated (refer to ISR1.RDO/
IMR1.RDO).
CRC16 Compare/Check
The received frame was aborted from the transmitting station.
According to the HDLC protocol, this frame must be discarded by the
receiver station.
1…
0…
Receive Data Overflow
0…
1…
Receive Message Aborted
RDO
(e.g. 25 bits), or
selected via MODE (MDS2...0) and the selection of receive CRC
ON/OFF (CCR3.RCRC) as follows:
• MDS2...0 = 011 (16 bit Address),
• MDS2...0 = 010 (8 bit Address),
RCRC = 0 : 4 bytes; RCRC = 1 : 3-4 bytes
RCRC = 0 : 3 bytes; RCRC = 1 : 2-3 bytes
valid HDLC frame
invalid HDLC frame
CRC check failed; received frame contains errors.
CRC check o.k.; received frame is error-free.
CRC16
RAB
247
HA1
HA0
FALC-LH V1.3
8 bits) in length
LA
E1 Registers
0
PEB 2255
2000-07
(65)