BT8954 CONEXANT [Conexant Systems, Inc], BT8954 Datasheet - Page 32

• Manufacturer Part Number: BT8954
• Description: VOICE PAIR GAIN FRAMER
• Manufacturer: CONEXANT [Conexant Systems, Inc]

3.0 Circuit Descriptions
3.4 Transmitter
Figure 3-8. Transmitter Block Diagram
3.4.1 OH/Signaling Registers
3-10
4-level 1
TFIFO
PCM
= Command Register Bit
S-BIT
EOC
3.4 Transmitter
The transmitter muxes payload data from the PCM channel with overhead and
signaling data into serially encoded 2B1Q data that is sent to the bit pump through
the TDAT pin.
Overhead (OH) registers, the Payload Mux, and the 2B1Q Encoder.
IND
The OH/Signaling registers are the S-Bits, IND, EOC, CRC, and SYNC word
registers. Refer to the Overhead Bit Allocation section,
positions in the DSL transmit frame. The OH/Signaling registers are accessible by
the microcomputer for writing and reading.
CRC
CRC REG
RDAT_DESCR
Figure 3-8
DD_LOOP
Conexant
1
0
OH/Signaling
Payload
Registers
MUX
details the transmitter block diagram, which consists of
Scrambler
SCRAM_EN
SYNC
1
0
Word
Stuff
QCLK
Table
Encoder
2B1Q
Voice Pair Gain Framer
BCLK
3-1, for the OH bit
TDAT
N8954DSC
Bt8954