XRT86SH221 Datasheet, PDF (272/353 Pages) Exar Corporation – SDH-TO-PDH FRAMER/MAPPER WITH INTEGRATED 21-CHANNEL E1 SH LIU

XRT86SH221
PRELIMINARY
SDH-TO-PDH FRAMER/MAPPER WITH INTEGRATED 21-CHANNEL E1 SH LIU
REV. P1.0.5
BIT 4 - Change of VT Label - Event Mask
This READ/WRITE bit-field permits the user to either enable or disable the Change of VT Label condition to/from
causing the VT Error Event Declared bit-field to be asserted. If the user enables this feature, then the Receive VT-De-
Mapper block will assert Bit 7 (VT Error Event Declared) within the Channel Control - VT Mapper Block - Egress
Direction - E1 Drop Control Register - Byte 1 to 1 anytime it declares the Change of VT Label condition. Conversely, if
the user disables this feature, then the Receive VT-De-Mapper block will NOT assert the VT Error Event Declared bit-
field whenever it declares the Change of VT Label condition.
0 - Configures the Receive VT-De-Mapper block to NOT assert the VT Error Event Declared bit-field whenever it
declares the Change of VT Label condition.
1 - Configures the Receive VT-De-Mapper block to assert the VT Error Event Declared bit-field whenever it declares
the Change of VT Label condition.
BIT 3 - Receive Elastic Store Overflow Event
This READ/W1C bit-field indicates whether or not the Receive Elastic Store Overflow event has occurred (within this
Tributary) since the last time that the user has written a 1 to clear this bit-field.
0 - Indicates that the Receive Elastic Store Overflow Event has NOT occurred since the last time the user has written
a 1 to clear this bit-field.
1 - Indicates that the Receive Elastic Store Overflow Event has occurred since the last time the user has written a 1
to clear this bit-field.
BIT 2 - AIS-V Failure - Event Mask
This READ/WRITE bit-field permits the user to either enable or disable the AIS-V Failure condition to/from causing the
VT Error Event Declared bit-field to be asserted. If the user enables this feature, then the Receive VT-De-Mapper block
will assert Bit 7 (VT Error Event Declared) within the Channel Control - VT Mapper Block - Egress Direction - E1 Drop
Control Register - Byte 1 to 1 anytime it declares the AIS-V Failure condition. Conversely, if the user disables this
feature, then the Receive VT-De-Mapper block will NOT assert the VT Error Event Declared bit-field whenever it
declares the AIS-V Failure condition.
0 - Configures the Receive VT-De-Mapper block to NOT assert the VT Error Event Declared bit-field whenever it
declares the AIS-V Failure condition.
1 - Configures the Receive VT-De-Mapper block to assert the VT Error Event Declared bit-field whenever it declares
the AIS-V Failure condition.
BIT 1 - AIS-V Failure Declared
This READ-ONLY bit-field indicates whether or not the Receive VT-De-Mapper block is currently declaring the AIS-V
Failure condition.
The Receive VT-De-Mapper block will declare the AIS-V Failure condition if it continuously declares the AIS-V Defect
condition for 2.5 ± 0.5 seconds. The Receive VT De-Mapper block will clear the AIS-V Failure condition, whenever it
has cleared the AIS-V Defect condition for 10 ± 0.5 seconds.
0 - Indicates that the Receive VT-De-Mapper block is NOT currently declaring the AIS-V Failure condition.
1 - Indicates that the Receive VT-De-Mapper block is currently declaring the AIS-V Failure condition.
BIT 0 - AIS-V Defect - Event Mask
This READ/WRITE bit-field permits the user to either enable or disable the AIS-V Defect condition to/from causing the
VT Error Event Declared bit-field to be asserted. If the user enables this feature, then the Receive VT-De-Mapper block
will assert Bit 7 (VT Error Event Declared) within the Channel Control - VT Mapper Block - Egress Direction - E1 Drop
Control Register - Byte 1 to 1 anytime it declares the AIS-V Defect condition. Conversely, if the user disables this
feature, then the Receive VT-De-Mapper block will NOT assert the VT Error Event Declared bit-field whenever it
declares the AIS-V Defect condition.
0 - Configures the Receive VT-De-Mapper block to NOT assert the VT Error Event Declared bit-field whenever it
declares the AIS-V Defect condition.
1 - Configures the Receive VT-De-Mapper block to assert the VT Error Event Declared bit-field whenever it declares
the AIS-V Defect condition.
263