bt8970 Mindspeed Technologies, bt8970 Datasheet - Page 24

• Manufacturer Part Number: bt8970
• Description: Single-chip Hdsl Transceiver
• Manufacturer: Mindspeed Technologies

2.0 Functional Description
2.2 Receive Section
2.2.3.1 Digital Front-End
Prior to the main signal processing, the input signal must be adjusted for any DC offset. The front-end module
also monitors the input signal level, which includes measuring DC and AC input signal levels, detecting and
counting overflows, and detecting alarms based on the far-end signal level.
of the digital front-end module.
Figure 2-4. Digital Front-End Block Diagram
2-6
Echo-Free
from NEC
ADC Data
Signal
Over ow
Detector
Preliminary Information/Conexant Proprietary and Confidential
Over ow Monitor
Accumulator
Level Meter
+
DC Offset
from MCI
Register
Far-End
Absolute
Result
Value
–
Over ow
Register
Counter
Result
Accumulator
DC Level
Register
Result
Meter
Conexant
High Threshold
Low Threshold
from MCI
from MCI
Accumulator
Signal Level
Absolute
Register
Result
Value
Meter
r, To EC
Comparator
Comparator
Far-End
Alarms
Figure 2-4
Single-Chip HDSL Transceiver
summarizes the features
high_felm
Interrupt
low_felm
Interrupt
100101B
Bt8970
100101_008