PEB22554 SIEMENS [Siemens Semiconductor Group], PEB22554 Datasheet - Page 354

• Manufacturer Part Number: PEB22554
• Description: ICs for Communications
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

BOM…
Receive Signaling Status Register (Read)
RSIS
RSIS relates to the last received HDLC or BOM frame; it is copied into RFIFO when
end-of-frame is recognized (last byte of each stored frame).
VFR…
RDO…
CRC16…
Semiconductor Group
7
VFR
Bit Oriented Message
Significant only in ESF frame format and auto switching mode is
enabled.
0…
1…
Valid Frame
Determines whether a valid frame has been received.
– 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.
Receive Data Overflow
A data overflow has occurred during reception of the frame.
Additionally, an interrupt can be generated
(refer to ISR1.RDO/IMR1.RDO).
CRC16 Compare/Check
0
1
1
0
An invalid frame is either
RDO
(e.g. 25 bits), or
selected via MODE (MDS2-0) and the selection of receive CRC
ON/OFF (CCR2.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
invalid
HDLC mode
BOM mode
CRC check failed; received frame contains errors.
CRC check o.k.; received frame is error-free.
CRC16
RAB
354
HA1
Operational Description T1 / J1
HA0
HFR
0
8 bits) in length
LA
PEB 22554
(x65)
09.98