XRT94L33_3 Datasheet, PDF (468/801 Pages) Exar Corporation – -CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER - SONET REGISTERS

XRT94L33
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Table 314: RxE3 LAPD Status Register – G.751 (Address Location= 0xN319, where N ranges from 0x02
to 0x04)
BIT 7
Unused
R/O
0
BIT 6
RxABORT
R/O
0
BIT 5
BIT 4
RxLAPDType[1:0]
R/O
R/O
0
0
BIT 3
RxCR
Type
R/O
0
BIT 2
RxFCS
Error
R/O
0
BIT 1
End of
Message
R/O
0
BIT 0
Flag
Present
R/O
0
BIT NUMBER
7
6
5–4
NAME
Unused
RxABORT
RxLAPDType[1:0]
TYPE
R/O
DESCRIPTION
R/O Receive ABORT Sequence Indicator:
This READ-ONLY bit-field indicates whether or not the Receive LAPD
Controller sub-block has received an ABORT sequence (e.g., a string of
seven consecutive “0s”), as described below.
0 – Indicates that the Receive LAPD Controller sub-block has NOT
received an ABORT sequence.
1 – Indicates that the Receive LAPD Controller sub-block has received
an ABORT sequence.
Note:
Once the Receive LAPD Controlller sub-block receives an
ABORT sequence, it will set this bit-field “high”, until it
receives another LAPD Messages.
R/O 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] Message Type
0
0
CL Path Identification
0
1
Idle Signal Identification
1
0
Test Signal Identification
1
1
ITU-T Path Identification
3
RxCR Type
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.
2
RxFCS Error
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.
1
End of Message
R/O End of Message Indicator
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