LAN9303MI-AKZE Standard Microsystems (SMSC), LAN9303MI-AKZE Datasheet - Page 97

• Manufacturer Part Number: LAN9303MI-AKZE
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LAN9303MI-AKZE

• Lead Free Status / Rohs Status: Compliant

Small Form Factor Three Port 10/100 Managed Ethernet Switch with Dual MII/RMII/Turbo MII
Datasheet
SMSC LAN9303M/LAN9303Mi
7.2.1
7.2.1.1
7.2.1.2
Port x
GROUP
MAC
CODE
01001
10100
11110
Converter
NRZI
100BASE-TX Transmit
The 100BASE-TX transmit data path is shown in
internal to the PHY. Each major block is explained in the following sections.
MII MAC Interface
For a transmission, the Switch Fabric MAC drives the transmit data to the PHYs MII MAC Interface.
The MII MAC Interface is described in detail in
Note: The PHY is connected to the Switch Fabric MAC via standard MII signals. Refer to the IEEE
4B/5B Encoder
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.
RJ45
MII 25 MHz by 4 bits
MII Transmit Clock
SYM
802.3 specification for additional details.
0
1
2
NRZI
Internal
Internal
MLT-3
Converter
MLT-3
Figure 7.2 100BASE-TX Transmit Data Path
0
1
2
INTERPRETATION
MII MAC
Interface
CAT-5
100M
Table 7.2 4B/5B Code Table
PLL
RECEIVER
0000
0001
0010
MLT-3
DATASHEET
125 Mbps Serial
MLT-3
by 4 bits
97
25MHz
TX Driver
100M
Section 7.2.7, "MII MAC
DATA
Figure
Encoder
4B/5B
7.2. Shaded blocks are those which are
MLT-3
0
1
2
Table
25MHz by
INTERPRETATION
Magnetics
TRANSMITTER
5 bits
Interface".
7.2. Each 4-bit data-nibble
0000
0001
0010
Revision 1.4 (07-07-10)
Scrambler
and PISO
DATA