DP83848TSQ/NOPB National Semiconductor, DP83848TSQ/NOPB Datasheet - Page 23

• Manufacturer Part Number: DP83848TSQ/NOPB
• Description: IC TXRX ETHERNET PHYTER 40-LLP
• Manufacturer: National Semiconductor
• Type: Transceiverr

Specifications of DP83848TSQ/NOPB

• Number Of Drivers/receivers: 1/1
• Protocol: Ethernet
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 40-LLP
• Data Rate: 100Mbps
• Supply Voltage Range: 3V To 3.6V
• Logic Case Style: LLP
• No. Of Pins: 40
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 2 - 1 Year
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Data Rate Max: 10Mbps
• Driver Case Style: LLP
• For Use With: DP83848T-MAU-EK - BOARD EVALUATION DP83848T
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: DP83848TSQTR

4.0 Architecture
This section describes the operations within each trans-
ceiver module, 100BASE-TX and 10BASE-T. Each opera-
tion consists of several functional blocks and described in
the following:
— 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 inte-
grated, the differential output pins, PMD Output Pair, can
be directly routed to the magnetics.
The block diagram in Figure 6 provides an overview of
each functional block within the 100BASE-TX transmit sec-
tion.
125MHZ CLOCK
Figure 6. 100BASE-TX Transmit Block Diagram
100BASE-TX
LOOPBACK
BP_SCR
DIVIDE
TX_CLK
BY 5
MLT[1:0]
23
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
DP83848T implements the 100BASE-TX transmit state
machine diagram as specified in the IEEE 802.3u Stan-
dard, Clause 24.
4B5B CODE-GROUP
PMD OUTPUT PAIR
5B PARALLEL
NRZ TO NRZI
SCRAMBLER
ENCODER &
TO SERIAL
INJECTOR
ENCODER
TO MLT-3 /
TXD[3:0] /
COMMON
BINARY
DRIVER
TX_EN
MUX
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