DP83256VF-AP NSC [National Semiconductor], DP83256VF-AP Datasheet - Page 12

• Manufacturer Part Number: DP83256VF-AP
• Manufacturer: NSC [National Semiconductor]

3 0 Functional Description
3 3 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
During normal operation the Transmitter Block presents se-
rial data to a PMD transmitter
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
FIGURE 3-3 Transmitter Block Diagram
(Continued)
12
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
See Figure 3-3 Transmitter Block Diagram
Data Registers
Parity Checker
4B 5B Encoder
Repeat Filter
Smoother
Line State Generator
Injection Control Logic
Shift Register
NRZ to NRZI Encoder
TL F 11708 – 5