EVB9221-MINI SMSC, EVB9221-MINI Datasheet - Page 23
![EVALUATION BOARD LAN9221-ABZJ](/photos/9/10/91030/evb9221-mini_sml.jpg)
EVB9221-MINI
Manufacturer Part Number
EVB9221-MINI
Description
EVALUATION BOARD LAN9221-ABZJ
Manufacturer
SMSC
Datasheet
1.LAN9221-ABZJ.pdf
(152 pages)
Specifications of EVB9221-MINI
Main Purpose
Interface, Ethernet Controller (PHY and MAC)
Embedded
No
Utilized Ic / Part
LAN9221
Primary Attributes
1 Port, 100BASE-TX/10BASE-T
Secondary Attributes
16-Bit, HP Auto-MDIX, Full and Half Duplex Support, 32-Bit CRC
Processor To Be Evaluated
LAN9221
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
638-1074
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High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
Datasheet
Chapter 3 Functional Description
SMSC LAN9221/LAN9221i
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 microseconds for 10 Mbps and 0.96 microseconds for 100
Mbps.
The primary attributes of the MAC Function are:
The transmit and receive data paths are separate within the LAN9221/LAN9221i 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 LAN9221/LAN9221i. The MAC CSR's also provide a mechanism
for accessing the PHY’s internal registers through the internal SMI (Serial Management Interface) bus.
The receive and transmit FIFOs allow increased packet buffer storage to the MAC. The FIFOs are a
conduit between the host interface and the MAC through which all transmitted and received data and
status information is passed. Deep FIFOs allow a high degree of latency tolerance relative to the
various transport and OS software stacks reducing and minimizing overrun conditions. Like the MAC,
the FIFOs have separate receive and transmit data paths.
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.
DATASHEET
23
Revision 2.7 (03-15-10)
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