LAN9311-NZW Standard Microsystem (Smsc), LAN9311-NZW Datasheet - Page 84
LAN9311-NZW
Manufacturer Part Number
LAN9311-NZW
Description
Ethernet Switch 2-Port 10Mbps/100Mbps 128-Pin XVTQFP
Manufacturer
Standard Microsystem (Smsc)
Datasheet
1.LAN9311-NU.pdf
(460 pages)
Specifications of LAN9311-NZW
Package
128XVTQFP
Phy/transceiver Interface
MII
Number Of Primary Switch Ports
2
Maximum Data Rate
100 Mbps
Internal Memory Buffer Size
32 KB
Vlan Support
Yes
Power Supply Type
Analog
Minimum Single Supply Voltage
3 V
Maximum Single Supply Voltage
3.6 V
Maximum Supply Current
0.295 A
Maximum Power Dissipation
1070 mW
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Revision 1.7 (06-29-10)
7.2.1
7.2.1.1
7.2.1.2
Port x
MAC
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
802.3 specification for additional details.
NRZI
Internal
Internal
MLT-3
Converter
MLT-3
Figure 7.2 100BASE-TX Transmit Data Path
MII MAC
Interface
CAT-5
100M
PLL
MLT-3
DATASHEET
125 Mbps Serial
MLT-3
by 4 bits
84
25MHz
Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface
TX Driver
100M
Section 7.2.7, "MII MAC
Figure
Encoder
4B/5B
7.2. Shaded blocks are those which are
MLT-3
Table
25MHz by
Magnetics
5 bits
Interface".
7.2. Each 4-bit data-nibble
SMSC LAN9311/LAN9311i
Scrambler
and PISO
Datasheet
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