
PRELIMINARY
XRT86SH221
162
REV. P1.0.5
SDH-TO-PDH FRAMER/MAPPER WITH INTEGRATED 21-CHANNEL E1 SH LIU
RDI-P Unstable defect condition. The Receive STM-0 POH Processor block will declare a RDI-P I Unstable defect
condition whenever the RDI-P Unstable Counter reaches the value RDI-P THRD. The RDI-P Unstable counter is
incremented for each time that the Receive STM-0 POH Processor block receives an RDI-P value that differs from that
of the previous STM-0 frame. The RDI-P Unstable counter is cleared to 0 whenever the same RDI-P value is received
in RDI-P_THRD consecutive STM-0 frames.
N
OTE
:
Receiving a given RDI-P value, in RDI-P_THRD consecutive STM-0 frames also clears this bit-field to 0.
0 - Indicates that the Receive STM-0 POH Processor block is NOT currently declaring the RDI-P Unstable defect
condition.
1 - Indicates that the Receive STM-0 POH Processor block is currently declaring the RDI-P Unstable defect condition.
N
OTE
:
The user can specify the value for RDI-P_THRD by writing the appropriate data into Bits 3 through 0 (RDI-P
THRD) within the Receive STM-0 Path - SDH Receive RDI-P Register (Address Location= 0x0293).
BIT 1 - Loss of Pointer Indicator (LOP-P) Defect Declared
This READ-ONLY bit-field indicates whether or not the Receive STM-0 POH Processor block is currently declaring the
LOP-P (Loss of Pointer) defect condition.
The Receive STM-0 POH Processor block will declare the LOP-P defect condition, if it cannot detect a valid pointer (H1
and H2 bytes, within the TOH) within 8 to 10 consecutive SDH frames. Further, the Receive STM-0 POH Processor
block will declare the LOP-P defect condition, if it detects 8 to 10 consecutive NDF events. The Receive STM-0 POH
Processor block will clear the LOP-P defect condition, whenever it detects valid pointer bytes (e.g., the H1 and H2 bytes,
within the TOH) and normal NDF value for three consecutive incoming STM-0 frames.
0 - Indicates that the Receive STM-0 POH Processor block is NOT declaring the LOP-P defect condition.
1 - Indicates that the Receive STM-0 POH Processor block is currently declaring the LOP-P defect condition.
BIT 0 - Path AIS (AIS-P) Defect Declared
This READ-ONLY bit-field indicates whether or not the Receive STM-0 POH Processor block is currently declaring the
AIS-P defect condition. The Receive STM-0 POH Processor block will declare the AIS-P defect condition if it detects
all of the following conditions within three consecutive incoming STM-0 frames.·
The H1, H2 and H3 bytes are set to an All Ones pattern.·
The entire SPE is set to an All Ones pattern.
The Receive STM-0 POH Processor block will clear the AIS-P defect condition when it detects a valid STM-0 pointer
(H1 and H2 bytes) and a set or normal NDF for three consecutive STM-0 frames.
0 - Indicates that the Receive STM-0 POH Processor block is NOT currently declaring the AIS-P defect condition.
1 - Indicates that the Receive STM-0 POH Processor block is currently declaring the AIS-P defect condition
N
OTE
:
The Receive STM-0 POH Processor block will NOT declare the LOP-P defect condition if it detects an All Ones
pattern in the H1, H2 and H3 bytes. It will, instead, declare the AIS-P defect condition.
BIT [7:5] - Unused
BIT 4 - Detection of AIS Pointer Interrupt Status
This RESET-upon-READ bit-field indicates whether or not the Detection of AIS Pointer interrupt has occurred since the
last read of this register.If this interrupt is enabled, then the Receive STM-0 POH Processor block will generate this
interrupt anytime it detects an AIS Pointer in the incoming STM-0 data stream.
T
ABLE
110: R
ECEIVE
STM-0 P
ATH
- SDH R
ECEIVE
P
ATH
I
NTERRUPT
S
TATUS
2 (RPIS2 = 0
X
0289)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Unused
Detection of
AIS Pointer
Interrupt
Status
Detection of
Pointer
Change
Interrupt
Status
Unused
Change in
TIM-P Defect
Condition
Interrupt
Status
Change in Path
Trace Message
Unstable Defect
Condition
Interrupt Status
R/O
R/O
R/O
RUR
RUR
R/O
RUR
RUR
0
0
0
0
0
0
0
0