DP83848HSQ National Semiconductor, DP83848HSQ Datasheet - Page 23
DP83848HSQ
Manufacturer Part Number
DP83848HSQ
Description
IC, TRANSCEIVER, ENET PHYTER, 40LLP
Manufacturer
National Semiconductor
Datasheet
1.DP83848HSQ.pdf
(80 pages)
Specifications of DP83848HSQ
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 +125°C
Digital Ic Case Style
LLP
No. Of
RoHS Compliant
Interface Type
MII Serial, RMII
Rohs Compliant
Yes
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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 func-
tional blocks which convert synchronous 4-bit nibble data,
as provided 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 routed to the magnetics.
125MHZ CLOCK
100BASE-TX
LOOPBACK
BP_SCR
Figure 6. 100BASE-TX Transmit Block Diagram
DIVIDE
TX_CLK
BY 5
MLT[1:0]
4B5B CODE-GROUP
PMD OUTPUT PAIR
23
SCRAMBLER
5B PARALLEL
NRZ TO NRZI
ENCODER &
BINARY TO
The block diagram in Figure 6. provides an overview of
each functional block within the 100BASE-TX transmit
section.
The Transmitter section consists of the following func-
tional 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 applica-
tions where data conversion is not always required. The
DP83848H implements the 100BASE-TX transmit state
machine diagram as specified in the IEEE 802.3u Stan-
dard, Clause 24.
INJECTOR
TO SERIAL
ENCODER
COMMON
TXD[3:0] /
DRIVER
MLT-3 /
TX_EN
MUX
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