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DP83256 Datasheet(PDF) 13 Page - Texas Instruments

Part # DP83256
Description  PLAYER(TM) Device (FDDI Physical Layer Controller)
PDF  146 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DP83256 Datasheet(HTML) 13 Page - Texas Instruments

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30 Functional Description (Continued)
33 TRANSMITTER BLOCK
The Transmitter Block accepts 10-bit bytes consisting of
8 bits data 1 bit parity and 1 bit control information from
the Configuration Switch
The Transmitter Block performs the following operations
 Encodes the data from 4B to 5B coding
 Filters out code violations from the data stream
 Is capable of generating Idle Master Halt Quiet or oth-
er user defined symbol pairs
 Converts the data stream from NRZ to NRZI for trans-
mission
 Serializes data
During normal operation the Transmitter Block presents se-
rial data to a PMD transmitter
While in Internal Loopback mode the Transmitter Block
presents serial data to the Receiver Block While in the Ex-
ternal Loopback mode the Transmitter Block presents seri-
al data to the Clock Recovery Module
The Transmitter Block consists of the following functional
blocks
Data Registers
Parity Checker
4B5B Encoder
Repeat Filter
Smoother
Line State Generator
Injection Control Logic
Shift Register
NRZ to NRZI Encoder
See
Figure 3-3 Transmitter Block Diagram
TLF11708 – 5
FIGURE 3-3 Transmitter Block Diagram
12



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