DM9161 datasheet(12/47 Pages) ETC

12 / 47 page

DM9161

10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver

Final

Version: DM9161-DS-F02

May 10,2002

7. Functional Description

The DM9161 Fast Ethernet single chip transceiver, providing

the functionality as specified in IEEE 802.3u, integrates a

complete 100Base-TX module and a complete 10Base-T

module. The DM9161 provides a Media Independent

Interface (MII) as defined in the IEEE 802.3u standard

(Clause 22).

The DM9161 performs all PCS (Physical Coding Sublayer),

PMA (Physical Media Access), TP-PMD (Twisted Pair

Physical

Medium

Dependent)

sublayer,

10Base-T

Encoder/Decoder, and Twisted Pair Media Access Unit

(TPMAU) functions. Figure 1 shows the major functional

blocks implemented in the DM9161.

MII Interface

100Base-TX

Transmitter

100Base-TX

Receiver

10Base-T

Tranceiver

Carrier

Sense

Collision

Detection

Auto

Negotiation

MII Serial

Management

Interface

Figure 7-1

7.1 MII Interface

The DM 9161 provides a Media Independent Interface (MII)

as defined in the IEEE 802.3u standard (Clause 22).

The purpose of the MII interface is to provide a simple, easy

to implement connection between the MAC Reconciliation

layer and the PHY. The MII is designed to make the

differences between various media transparent to the MAC

sublayer.

The MII consists of a nibble wide receive data bus, a nibble

wide transmit data bus, and control signals to facilitate data

transfers between the PHY and the Reconciliation layer.

•

TXD (transmit data) is a nibble (4 bits) of data that are

driven by the reconciliation sublayer synchronously with

respect to TXCLK. For each TXCLK period, which

TXEN is asserted, TXD (3:0) are accepted for

transmission by the PHY.

•

TXCLK (transmit clock) output to the MAC reconciliation

sublayer is a continuous clock that provides the timing

reference for the transfer of the TXEN, TXD, and TXER

signals.

•

TXEN (transmit enable) input from the MAC

reconciliation sublayer indicates that nibbles are being

presented on the MII for transmission on the physical

medium.

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