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TNETE100A Datasheet(PDF) 2 Page - Texas Instruments

Part # TNETE100A
Description  PCI ETHERNETE CONTROLLER SINGLE-CHIP 10 BASE-T WITH MII FOR 100 BASE-T/100VG-AnyLAN
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TNETE100A Datasheet(HTML) 2 Page - Texas Instruments

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ThunderLAN
™ TNETE100A
PCI ETHERNET
™ CONTROLLER
SINGLE-CHIP 10 BASE-T WITH MII FOR 100 BASE-T/100VG-AnyLAN
SPWS021B – OCTOBER 1995 – REVISED NOVEMBER 1996
2
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
PCI
Bus
PCI
Bus Master
Control
FIFO
Registers
Multiplexed
SRAM
FIFO
Ethernet
LAN
Controller
10 / 100 Mbps
10 Base-T
Physical
Layer
Interface
10 Base-T
Ethernet
Media-
Independent
Interface
10 Base-5
(AUI)
Figure 1. ThunderLAN Architecture
description
ThunderLAN is a high-speed networking architecture that provides a complete PCI-to-10 Base-T/AUI Ethernet
solution with the flexibility to handle 100-Mbps Ethernet protocols as networking demands grow.
The TNETE100A, an implementation of the ThunderLAN architecture, is an intelligent protocol network
interface. The ThunderLAN SRAM FIFO-based architecture eliminates the need for external memory and offers
a single-chip glueless PCI-to-10 Base-T/AUI (IEEE 802.3) solution with an on-board physical layer interface.
Modular support for 100 Base-T (IEEE 802.3u), and 100VG-AnyLAN (IEEE 802.12) is provided by a superset
of the industry-standard media independent interface (MII). ThunderLAN uses a single driver suite to support
multiple networking protocols.
The glueless PCI interface supports 32-bit streaming, operates at speeds up to 33 MHz and is capable of
internal data-transfer rates up to 2 Gbps, taking full advantage of all available PCI bandwidth. The TNETE100A
offers jumperless autoconfiguration using PCI configuration read / write cycles. Customizable configuration
registers, which can be autoloaded from an external serial EEPROM, allow designers of TNETE100A-based
systems to give their systems a unique identification code. The TNETE100A PCI interface, developed in
conjunction with other leaders in the semiconductor and computer industries, has been tested vigorously on
multiple platforms to ensure compatibility across a wide array of available PCI products. In addition, the
ThunderLAN drivers and ThunderLAN architecture use TI’s patented adaptive performance optimization (APO)
technology to adjust dynamically critical parameters for minimum latency, minimum host CPU utilization, and
maximum system performance. This technology ensures that the maximum capabilities of the PCI interface are
used by automatically tuning the controller to the specific system in which it is operating.
The MII, an industry-standard interface for connecting a variety of external IEEE 802.3u physical layer
interfaces, is supported fully by the TNETE100A. In addition, the TNETE100A features an IEEE
802.12-compliant superset of the MII to allow for support of 100VG-AnyLAN physical layer interfaces. This
allows TNETE100A-based systems to support 100 Base-TX, 100 Base-FX, 100 Base-T4, and 100VG-AnyLAN
cabling schemes for maximum flexibility as each new physical-layer interface becomes available in the
marketplace.
An intelligent protocol handler (PH) implements the serial protocols of the network. The PH is designed for
minimum overhead related to multiple protocols, using common state machines to implement 95 percent of the
total PH. On transmit, the PH serializes data, adds framing and cyclic redundancy check (CRC) fields, and
interfaces to the network physical layer (PHY) chip. On receive, it provides address recognition, CRC and error
checking, frame disassembly, and deserialization. Data for multiple channels is passed to and from the PH by
way of circular-buffer FIFOs in the FIFO SRAM.
ThunderLAN is the first multimedia-ready architecture and is capable of prioritized data regardless of the
selected protocol. The demand-priority protocol supports two priorities of frames: normal and priority
. The two
transmit channels provide independent host channels for these two frame types. Carrier-sense multiple access
with collision detection (CSMA / CD) protocols only support a single priority of frame, but the two channels can
be used to prioritize network access. All received frames pass through the single receive-channel.


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