LAN91C100 Datasheet, PDF (1/101 Pages) SMSC Corporation – FEAST™ Fast Ethernet Controller

LAN91C100
ADVANCE INFORMATION
FEAST™
Fast Ethernet Controller
FEATURES
• Dual Speed CSMA/CD Engine (10 Mbps
• Built-in Transparent Arbitration for Slave
and 100 Mbps)
Sequential Access Architecture
• Compliant with IEEE 802.3 100BASE-T
• Flat MMU Architecture with Symmetric
Specification
Transmit and Receive Structures and
• Supports 100BASE-TX, 100BASE-T4, and
Queues
10BASE-T Physical Interfaces
• MII (Media Independent Interface)
• 32 Bit Wide Data Path (Into Packet Buffer
Compliant MAC-PHY Interface (Compliant
Memory)
with Emerging MII Standard Interface)
• Support for 32 and 16 Bit Buses
• MII Management Serial Interface
• Support for 32, 16 and 8 Bit CPU Accesses
• Seven Wire Interface to 10 Mbps ENDEC
• Synchronous, Asynchronous and Burst
(LAN83C694)
DMA Interface Mode Options
• EEPROM-Based Setup
• 128 Kbyte External Memory
• 208 Pin PQFP and TQFP Package
GENERAL DESCRIPTION
The LAN91C100 FEAST is a high-speed
network controller designed to facilitate the
implementation of Fast Ethernet adapters and
connectivity products. It contains a dual speed
CSMA/CD engine that implements the MAC
portion of the CSMA/CD protocol at 10 and 100
Mbps and couples it with a lean and fast data
and control path system architecture to ensure
data movement with no bottlenecks at 100
Mbps.
Memory management is handled using a unique
MMU (Memory Management Unit) architecture
and a 32-bit wide data path. This I/O mapped
architecture can sustain back-to-back frame
transmission and reception for superior data
throughput and optimal performance. It also
dynamically allocates buffer memory in an
efficient buffer utilization scheme, reducing
software tasks and relieving the host CPU from
performing these housekeeping functions. The
total memory size is 128 Kbytes (external),
equivalent to a total chip storage (transmit and
receive) of 64 outstanding packets.
FEAST provides a flexible slave interface for
easy connectivity with industry-standard buses.
The Bus Interface Unit (BIU) can handle
synchronous as well as asynchronous buses,
with different signals being used for each one.
FEAST's bus interface supports synchronous
buses like the VESA local bus, as well as burst
mode DMA for EISA environments.
Asynchronous bus support for ISA is supported