bt8970 Mindspeed Technologies, bt8970 Datasheet - Page 19

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

2.1 Transmit Section
The transmit section is illustrated in
selector/scrambler, a variable gain digital-to-analog converter (DAC), a pulse-shaping filter, and a line driver.
Figure 2-1. Transmit Section Block Diagram
2.1.1 Symbol Source Selector/Scrambler
The input source selector/scrambler can be configured through the Transmitter Modes Register
[transmitter_modes; 0x0B] data_source [2:0] bits to select the source of the data to be transmitted and
determine whether or not the data is scrambled. The symbol source selector/scrambler modes are specified in
Table
100101B
TQ[1,0]
2-1.
Detector Loopback
Isolated Pulses
Channel Unit
Transmit
Interface
Ones (1s)
Preliminary Information/Conexant Proprietary and Confidential
2.0 Functional Description
2
Figure
Scrambler
Source/
Symbol
2-1. It comprises four major functions: a symbol source
Registers
Conexant
Control
Variable-Gain
DAC
Shaping
Pulse-
Filter
External
RC Filter
Driver
Line
TXP
TXN
100101_005
2-1