LAN9303-ABZJ SMSC, LAN9303-ABZJ Datasheet - Page 90

• Manufacturer Part Number: LAN9303-ABZJ
• Description: IC ETHER SW 3PORT 16BIT 56QFN
• Manufacturer: SMSC

Specifications of LAN9303-ABZJ

• Controller Type: Ethernet Switch Controller
• Interface: SMBus (2-Wire/I²C)
• Voltage - Supply: 3 V ~ 3.6 V
• Current - Supply: 190mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 56-QFN
• Product: Ethernet Switches
• Standard Supported: Yes
• Data Rate: 10 Mbps/100 Mbps
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Supply Current (max): 0.19 A (Typ)
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• For Use With: 638-1095 - EVALUATION BOARD FOR LAN9303
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 638-1082

Revision 1.4 (07-07-10)
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
Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII
100M
PLL
MLT-3
DATASHEET
125 Mbps Serial
MLT-3
by 4 bits
90
25MHz
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 LAN9303/LAN9303i
Scrambler
and PISO
Datasheet