ACD81024 查看數據表（PDF） - Unspecified

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ACD81024

24 Ports Single Chip 10Base-T Ethernet Switch Designed For Desktop Environment

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1. GENERAL DESCRIPTION

• No need of external memory

• No need of external glue logic

ACD81024 is a single chip system integration of an • Built-in 10BASE-T transceiver

entire 24 port Ethernet switch, specifically designed for • Built-in clock and data recovery circuitry

networks compliance with IEEE 802.3 10Base-T stan- • Smart squelch intelligence

dard. All active components of a 24 port Ethernet switch • Polarity detection and correction

system, including the 10BASE-T transceivers, clock and • Link integrity pulse detection and generation

data recovery circuitry, Manchester ENDEC, Media • Manchester ENDEC

Access Control logic, Lookup Engine, Switch Fabric, • Media Access Control logic

and Switch Control logic are all integrated into a single • FCS verification

semiconductor chip. ACD81024 can be used to build a • Storage of one MAC address per port

desktop class 10BASE-T Ethernet switch system with • Lookup Engine

very low cost and very short time-to-market cycle. To • Non-blocking Switching Fabric

build a marketable Ethernet switch system using • Fabric Control logic

ACD81024 requires no more than a DC power supply, • Back-pressure congestion control

EMI/RFI filter/transformer modules, RJ45 connectors, • Automatic MAC address learning

LEDs, and LED drivers.

• Cut-through switching mode with constant low

latency < 16 us

• LED display of each port’s Link Status, Transmit,

2. MAIN FEATURES

Receive, Collision, Congestion, Jabber, and FCS

Error indication

• Single chip integration of a Ethernet switch

• One expansion port for connecting with other

system

interconnection devices

• Supports 24 10Base-T ports

• Line speed forwarding rate

• Very short time-to-market cycle

• 208 pin PQFP package with built-in Heat-Sink

• Single 5V power supply

System Block Diagram

MAC

MAC

MAC

PHY

PHY

PHY

PHY

PHY

TxRx

SWITCH FABRIC

MAC

PHY

TxRx

Port 1

Port 2

Port 3

Port 24

SWITCH CONTROL

LOOKUP ENGINE

LED CONTROL

ACD Confidential. Do Not Reproduce. Use under Non-Disclosure agreement only.

3

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