LAN89218AQ_samples SMSC, LAN89218AQ_samples Datasheet - Page 24

• Manufacturer Part Number: LAN89218AQ_samples
• Description: Ethernet ICs High Perform Chip 10/100 NonPCI Cntrl
• Manufacturer: SMSC

Specifications of LAN89218AQ_samples

• Ethernet Connection Type: 10BASE-T, 100BASE-TX
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Product: Ethernet Controllers
• Standard Supported: IEEE802.3, IEEE802.3u
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 3 V
• Maximum Operating Temperature: + 85 C
• Package / Case: TQFP-100
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Chapter 3 Functional Description
Revision 1.3 (02-23-10)
3.1
The Ethernet Media Access controller (MAC) incorporates the essential protocol requirements for
operating an Ethernet/IEEE 802.3-compliant node and provides an interface between the host
subsystem and the internal Ethernet PHY. The MAC can operate in either 100-Mbps or 10-Mbps mode.
The MAC operates in both half-duplex and full-duplex modes. When operating in half-duplex mode,
the MAC complies fully with Section 4 of ISO/IEC 8802-3 (ANSI/IEEE standard) and ANSI/IEEE 802.3
standards. When operating in full-duplex mode, the MAC complies with IEEE 802.3x full-duplex
operation standard.
The MAC provides programmable enhanced features designed to minimize host supervision, bus
utilization, and pre- or post-message processing. These features include the ability to disable retries
after a collision, dynamic FCS (Frame Check Sequence) generation on a frame-by-frame basis,
automatic pad field insertion and deletion to enforce minimum frame size attributes, layer 3 checksum
calculation for transmit and receive operations, and automatic retransmission and detection of collision
frames.
The MAC can sustain transmission or reception of minimally-sized back-to-back packets at full line
speed with an interpacket gap (IPG) of 9.6 µs for 10 Mbps and 0.96 µs for 100 Mbps.
The primary attributes of the MAC Function are:
The transmit and receive data paths are separate within the LAN89218 from the MAC to host interface
allowing the highest performance, especially in full duplex mode. Payload data as well as transmit and
receive status are passed on these busses.
A third internal bus is used to access the MAC’s “Control and Status Registers” (CSR’s). This bus is
also accessible from the host.
On the backend, the MAC interfaces with the 10/100 PHY through an MII (Media Independent
Interface) port which is internal to the LAN89218. The MAC CSR's also provide a mechanism for
accessing the PHY’s internal registers through the internal SMI (Serial Management Interface) bus.
10/100 Ethernet MAC
Transmit and receive message data encapsulation
Framing (frame boundary delimitation, frame synchronization)
Error detection (physical medium transmission errors)
Media access management
Medium allocation (collision detection, except in full-duplex operation)
Contention resolution (collision handling, except in full-duplex operation)
Flow control during full-duplex mode
Decoding of control frames (PAUSE command) and disabling the transmitter
Generation of control frames
Interface to the internal PHY.
Checksum offload engine for calculation of layer 3 transmit and receive checksum.
High Performance Single-Chip 10/100 Ethernet Controller for Automotive Applications
DATASHEET
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SMSC LAN89218
Datasheet