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DM9000B

Ethernet Controller With General Processor Interface

Davicom Semiconductor, Inc. 

DM9000B

Ethernet Controller with General Processor Interface

1. General Description

The DM9000B is a fully integrated and cost-effective

low pin count single chip Fast Ethernet controller with

a general processor interface, a 10/100M PHY and 4K

Dword SRAM. It is designed with low power and high

performance process interface that support 3.3V with

5V IO tolerance.

The DM9000B supports 8-bit and 16-bit data

interfaces to internal memory accesses for various

processors. The PHY of the DM9000B can interface to the

UTP3, 4, 5 in 10Base-T and UTP5 in 100Base-TX with

HP Auto-MDIX. It is fully compliant with the IEEE 802.3u

Spec. Its auto-negotiation function will automatically

configure the DM9000B to take the maximum advantage of

its abilities. The DM9000B also supports IEEE 802.3x full-

duplex flow control.

2. Block Diagram

LED

EEPROM

Interface

TX+/-

RX+/-

PHYceiver

100 Base-TX

transceiver

100 Base-TX

PCS

AUTO-MDIX

10 Base-T

Tx/Rx

MAC

MII

TX Machine

Control

&Status

Registers

RX Machine

Autonegotiation

MII Management

Control

& MII Register

Memory

Management

Internal

SRAM

Final

6

Version: DM9000B-13-DS-F02

June 4, 2009

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