LAN89218AQ Standard Microsystems (SMSC), LAN89218AQ Datasheet - Page 72
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LAN89218AQ
Manufacturer Part Number
LAN89218AQ
Description
Manufacturer
Standard Microsystems (SMSC)
Datasheet
1.LAN89218AQ.pdf
(155 pages)
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Chapter 4 Internal Ethernet PHY
Revision 1.3 (02-23-10)
4.1
4.2
4.2.1
Functionally, the internal PHY can be divided into the following sections:
The data path of the 100Base-TX is shown in
4B/5B Encoding
The transmit data passes from the MII block to the 4B/5B encoder. This block encodes the data from
4-bit nibbles to 5-bit symbols (known as “code-groups”) according to
is mapped to 16 of the 32 possible code-groups. The remaining 16 code-groups are either used for
control information or are not valid.
The first 16 code-groups are referred to by the hexadecimal values of their corresponding data nibbles,
0 through F. The remaining code-groups are given letter designations with slashes on either side. For
example, an IDLE code-group is /I/, a transmit error code-group is /H/, etc.
The encoding process may be bypassed by clearing bit 6 of register 31. When the encoding is
bypassed the 5
Top Level Functional Description
100Base-TX Transmit
100Base-TX transmit and receive
10Base-T transmit and receive
Internal MII interface to the Ethernet Media Access Controller
Auto-negotiation to automatically determine the best speed and duplex possible
Management Control to read status registers and write control registers
MAC
Converter
NRZI
RJ45
th
MII 25 MHz by 4 bits
transmit data bit is equivalent to TX_ER.
TX_CLK
NRZI
Internal
MLT-3
Figure 4.1 100Base-TX Data Path
High Performance Single-Chip 10/100 Ethernet Controller for Automotive Applications
Converter
MLT-3
100M
PLL
CAT-5
DATASHEET
125 Mbps Serial
MII
MLT-3
MLT-3
72
Figure
by 4 bits
25 MHz
Driver
Tx
4.1. Each major block is explained below.
Encoder
4B/5B
MLT-3
Magnetics
by 5 bits
25 MHz
Table
4.1. Each 4-bit data-nibble
Scrambler
and PISO
SMSC LAN89218
Datasheet
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