LAN9211_0711 SMSC [SMSC Corporation], LAN9211_0711 Datasheet - Page 12

• Manufacturer Part Number: LAN9211_0711
• Description: High-Performance Small Form Factor Single-Chip Ethernet Controller with HP Auto-MDIX
• Manufacturer: SMSC [SMSC Corporation]

Revision 1.93 (11-27-07)
1.1
1.2
1.3
16-bit SRAM I/F
Wakup Indicator
PME
FIFO_SEL
IRQ
This section provides an overview of each of these functional blocks as shown in
Block
The LAN9211 integrates an IEEE 802.3 physical layer for twisted pair Ethernet applications. The PHY
can be configured for either 100 Mbps (100BASE-TX) or 10 Mbps (10BASE-T) Ethernet operation in
either full or half duplex configurations. The PHY block supports HP Auto-MDIX and auto-negotiation.
Minimal external components are required for the utilization of the Integrated PHY.
The transmit and receive data paths are separate within the MAC allowing the highest performance
especially in full duplex mode. The data paths connect to the PIO interface Function via separate
busses to increase performance. Payload data as well as transmit and receive status is passed on
these busses.
A third internal bus is used to access the MAC’s Control and Status Registers (CSR’s). This bus is
accessible from the host through the PIO interface function.
On the backend, the MAC interfaces with the internal 10/100 PHY through a MII (Media Independent
Interface) port internal to the LAN9211. The MAC CSR's also provide a mechanism for accessing the
PHY’s internal registers through the internal SMI (Serial Management Interface) bus.
Internal Block Overview
10/100 Ethernet PHY
10/100 Ethernet MAC
Diagram".
Host Bus Interface
Power Management
PIO Controller
Controller
GP Timer
Interrupt
(HBI)
Figure 1.2 Internal Block Diagram
Configurable RX FIFO
Configurable TX FIFO
RX Status FIFO
TX Status FIFO
2kB to 14kB
2kB to 14kB
3.3V to 1.8V
Regulator
DATASHEET
+3.3V
12
High-Performance Small Form Factor Single-Chip Ethernet Controller with HP Auto-MDIX
25MHz
PLL
Ethernet
Buffer - 128 bytes
Buffer - 2K bytes
MIL - RX Elastic
MIL - TX Elastic
Offload Engine
Offload Engine
10/100
RX Checksum
TX Checksum
MAC
(Optional)
Controller
EEPROM
EEPROM
Ethernet
10/100
PHY
Figure 1.2, "Internal
SMSC
Datasheet
LAN9211
LAN