XRT79L71_1 Datasheet, PDF (109/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

REV. 1.0.0
XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
Receive E3 LAPD Status Register - G.751 (Address = 0x1119)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
Unused
RxABORT
RxLAPDType[1:0]
RxCR Type RxFCS Error
R/O
R/O
R/O
R/O
R/O
R/O
0
0
0
0
0
0
BIT 1
End of
Message
R/O
0
BIT 0
Flag Present
R/O
0
BIT NUMBER
NAME
7
Unused
6
RxABORT
5-4
RxLAPDType[1:0]
3
RxCR Type
2
RxFCS Error
TYPE
R/O
R/O
R/O
DESCRIPTION
Receive ABORT Sequence Indicator:
This READ-ONLY bit-field indicates whether or not the Receive
LAPD Controller block has received an ABORT sequence (e.g.,
a string of seven consecutive "0s"), as described below.
0 - Indicates that the Receive LAPD Controller block has NOT
received an ABORT sequence.
1 - Indicates that the Receive LAPD Controller block has
received an ABORT sequence.
NOTE: Once the Receive LAPD Controller block receives an
ABORT sequence, it will set this bit-field "High", until it
receives another LAPD Message.
Receive LAPD Message Type Indicator:
These two READ-ONLY bits indicate the type of LAPD Message
that is residing within the Receive LAPD Message buffer. The
relationship between the content of these two bit-fields and the
corresponding message type is presented below.
RxLAPDType[1:0]
0
0
0
1
1
0
1
1
Message Type
CL Path Identification
Idle Signal Identification
Test Signal Identification
ITU-T Path Identification
R/O Received C/R Value:
This READ-ONLY bit-field indicates the value of the C/R bit
(within one of the header bytes) of the most recently received
LAPD Message.
R/O Receive Frame Check Sequence (FCS) Error Indicator:
This READ-ONLY bit-field indicates whether or not the most
recently received LAPD Message frame contained an FCS error.
0 - Indicates that the most recently received LAPD Message
frame does not contain an FCS error.
1 - Indicates that the most recently received LAPD Message
frame does contain an FCS error.
100