DM9161A

10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver

1. General Description

The DM9161A is a physical layer, single-chip, and low power transceiver for 100BASE-TX and 10BASE-T operations. On the media side, it provides a direct interface either to Unshielded Twisted Pair Category 5 Cable (UTP5) for 100BASE-TX Fast Ethernet, or UTP5/UTP3 Cable for 10BASE-T Ethernet. Through the Media Independent Interface (MII), the DM9161A connects to the Medium Access Control (MAC) layer, ensuring a high inter operability from different vendors.

TheDM9161A uses a low power and high performance advanced CMOS process. It contains the entire physical layer functions of 100BASE-TX as defined by IEEE802.3u, including the Physical Coding Sublayer (PCS), Physical Medium Attachment (PMA), Twisted Pair Physical Medium Dependent Sublayer (TP-PMD), 10BASE-TX Encoder/Decoder (ENC/DEC), and Twisted Pair Media Access Unit (TPMAU). The DM9161A provides a strong support for the auto-negotiation function, utilizing automatic media speed and protocol selection. Furthermore, due to the built-in wave shaping filter, the DM9161A needs no external filter to transport signals to the media in 100BASE-TX or 10BASE-T Ethernet operation.

2. Features „

* Fully comply with IEEE 802.3 / IEEE 802.3u 10Base-T/ 100Base-TX, ANSI X3T12 TP-PMD 1995

standard „ Support MDI/MDI-X auto crossover function (Auto-MDI) „

* Support Auto-Negotiation function, compliant with IEEE 802.3u „

* Fully integrated Physical layer transceiver On-chip filtering with direct interface to magnetic transformer

*„ Selectable repeater or node mode „

* Selectable MII or RMII (Reduced MII) mode for 100Base-TX and 10Base-TX. Selectable MII or

GPSI (7-Wired) mode for 10Base-T „

* Selectable full-duplex or half-duplex operation „ MII management interface with maskable interrupt

output capability „

* Provide Loopback mode for easy system diagnostics „

* LED status outputs indicate Link/ Activity, Speed10/100 and Full-duplex/Collision. Support

Dual-LED optional control „

* Single low power Supply of 3.3V with an advanced CMOS technology „

* Very Low Power consumption modes:

● Power Reduced mode (cable detection)

● Power Down mode

● Selectable TX drivers for 1:1 or 1.25:1 transformers for additional power reduction.

1: 1 transformers only when HP Auto-MDIX Enable . „

* Compatible with 3.3V and 5.0V tolerant I/Os „

* 48-pin LQFP

3. Block Diagram

4. Pin Configuration:

Absolute Maximum Ratings ( 25°C )