
XRT86SH221
PRELIMINARY
147
SDH-TO-PDH FRAMER/MAPPER WITH INTEGRATED 21-CHANNEL E1 SH LIU
REV. P1.0.5
BIT [7:0] - SD_SET_THRESHOLD - LSB
These READ/WRITE bits, along the contents of the Receive STM-0 Transport - SD SET Threshold - Byte 1 registers
are used to specify the number of B2 bit errors that will cause the Receive STM-0 TOH Processor block to declare an
SD (Signal Degrade) defect condition.
When the Receive STM-0 TOH Processor block is checking for declaring the SD defect condition, it will accumulate B2
byte errors throughout the SD Defect Monitoring Period. If the number of accumulated B2 byte errors exceeds that which
has been programmed into this and the Receive STM-0 Transport SD SET Threshold - Byte 1 register, then the Receive
STM-0 TOH Processor block will declare the SD defect condition.
BIT [7:0] - SD_CLEAR_THRESHOLD - MSB
These READ/WRITE bits, along the contents of the Receive STM-0 Transport - SD CLEAR Threshold - Byte 0 registers
are used to specify the upper limit for the number of B2 byte errors that will cause the Receive STM-0 TOH Processor
block to clear the SD (Signal Degrade) defect condition.
When the Receive STM-0 TOH Processor block is checking for clearing the SD defect condition, it will accumulate B2
byte errors throughout the SD Defect Clearance Monitoring Period. If the number of accumulated B2 byte errors is less
than that programmed into this and the Receive STM-0 Transport SD CLEAR Threshold - Byte 0 register, then the
Receive STM-0 TOH Processor block will clear the SD defect condition.
BIT [7:0] - SD_CLEAR_THRESHOLD - LSB
These READ/WRITE bits, along the contents of the Receive STM-0 Transport - SD CLEAR Threshold - Byte 1 registers
are used to specify the upper limit for the number of B2 byte errors that will cause the Receive STM-0 TOH Processor
block to clear the SD (Signal Degrade) defect condition.
When the Receive STM-0 TOH Processor block is checking for clearing the SD defect condition, it will accumulate B2
byte errors throughout the SD Defect Clearance Monitoring Period. If the number of accumulated B2 byte errors is less
than that programmed into this and the Receive STM-0 Transport SD CLEAR Threshold - Byte 1 register, then the
Receive STM-0 TOH Processor block will clear the SD defect condition.
T
ABLE
89: R
ECEIVE
STM-0 T
RANSPORT
- R
ECEIVE
SD SET T
HRESHOLD
0 (RSDST0 = 0
X
0243)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
SD_SET_THRESHOLD[7:0]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
1
1
1
1
1
1
1
T
ABLE
90: R
ECEIVE
STM-0 T
RANSPORT
- R
ECEIVE
SD CLEAR T
HRESHOLD
1 (RSDCT1= 0
X
0246)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
SD_CLEAR_THRESHOLD[15:8]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
1
1
1
1
1
1
1
T
ABLE
91: R
ECEIVE
STM-0 T
RANSPORT
- R
ECEIVE
SD CLEAR T
HRESHOLD
0 (RSDCT0 = 0
X
0247)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
SD_CLEAR_THRESHOLD[7:0]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
1
1
1
1
1
1
1