
XRT86SH328
PRELIMINARY
198
28-CHANNEL DS1/E1 FRAMER/LIU WITH DS3 MUX & VT-MAPPER - SONET APPLICATIONS
REV. P1.0.6
BIT7 - Unused:
BIT6 - Receive ABORT:
This READ-ONLY bit-field indicates that the Receive LAPD Controller block has received an ABORT sequence (e.g., a
string of seven consecutive 0s) within the incoming data-stream.
`
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.
N
OTE
:
Once the Receive LAPD Controller block receives an ABORT Sequence, it will set this bit-field high until it
receives another LAPD Message.
BIT[5:4] - Receive LAPD Message Type[1:0]:
These two READ-ONLY bit-fields indicate the type of LAPD Message that is residing within the Receive LAPD Message
Buffer. The relationship between the contents of these two bit-fields and the corresponding message type is presented
below.
BIT 3 - Receive C/R Type:
This READ-ONLY bit-field indicates the value of the C/R bit-field (within one of the header bytes) of the most recently
received LAPD Message.
BIT 2 - Receive LAPD FCS Error Detected:
This READ-ONLY bit-field indicates whether or not the most recently received LAPD Message frame contained an FCS
error or not.
`
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.
BIT 1 - End of Message:
This READ-ONLY bit-field indicates whether or not the Receive LAPD Controller block has received a complete LAPD
Message.
`
0 - Indicates that the Receive LAPD Controller block is currently receiving a LAPD Message, but has not received the
complete message.
`
1 - Indicates that the Receive LAPD Controller block has received a complete LAPD Message.
N
OTE
:
Once the Receive LAPD Controller block sets this bit-field high, this bit-field will remain high until the Receive
LAPD Controller block begins to receive a new LAPD Message.
BIT 0 - Flag Sequence Present:
T
ABLE
257: DS3 F
RAMER
B
LOCK
- R
ECEIVE
DS3 LAPD S
TATUS
R
EGISTER
(A
DDRESS
= 0
X
0E19)
BIT7
BIT6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Unused
Receive
ABORT
RxLAPD_Msg_Type[1:0]
Receive C/R
Type
Receive
LAPD FCS
Error
Detected
End of
Message
Flag
Sequence
Present
R/O
R/O
R/O
R/O
R/O
R/O
R/O
R/O
0
0
0
0
0
0
0
0
Message Type
R
ECEIVE
LAPD M
ESSAGE
T
YPE
[1:0]
M
ESSAGE
T
YPE
0
0
CL Path Identification
0
1
Idle Signal Identification
1
0
Test Signal Identification
1
1
ITU-T Path Identification