DP83848VYB National Semiconductor, DP83848VYB Datasheet - Page 20

• Manufacturer Part Number: DP83848VYB
• Description: TRANSCEIVER, ENET PHY, 10/100, 48LQFP
• Manufacturer: National Semiconductor

Specifications of DP83848VYB

• Data Rate: 100Mbps
• No. Of Ports: 1
• Ethernet Type: IEEE 802.3u
• Supply Current: 92mA
• Supply Voltage Range: 3V To 3.6V
• Operating Temperature Range: -40°C To +105°C
• Digital Ic Case Style: LQFP
• No.: RoHS Compliant
• Interface Type: MII Serial, RMII
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Not Compliant

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4.0 Architecture
This section describes the operations within each transceiver
module, 100BASE-TX and 10BASE-T. Each operation con-
sists of several functional blocks and described in the follow-
ing:
— 100BASE-TX Transmitter
— 100BASE-TX Receiver
— 10BASE-T Transceiver Module
4.1 100BASE-TX TRANSMITTER
The 100BASE-TX transmitter consists of several functional
blocks which convert synchronous 4-bit nibble data, as pro-
vided by the MII, to a scrambled MLT-3 125 Mb/s serial data
stream. Because the 100BASE-TX TP-PMD is integrated, the
differential output pins, PMD Output Pair, can be directly rout-
ed to the magnetics.
FIGURE 5. 100BASE-TX Transmit Block Diagram
20
The block diagram in Figure 5. provides an overview of each
functional block within the 100BASE-TX transmit section.
The Transmitter section consists of the following functional
blocks:
— Code-group Encoder and Injection block
— Scrambler block (bypass option)
— NRZ to NRZI encoder block
— Binary to MLT-3 converter / Common Driver
The bypass option for the functional blocks within the
100BASE-TX transmitter provides flexibility for applications
where data conversion is not always required. The
DP83848VYB implements the 100BASE-TX transmit state
machine diagram as specified in the IEEE 802.3u Standard,
Clause 24.
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