DM9161 datasheet(13/47 Pages) ETC

13 / 47 page

DM9161

10/100 Mbps Fast Ethernet Physical Layer Single Chip Transceiver

Final

Version: DM9161-DS-F02

May 10,2002

MII Interface (continued)

•

TXER

(transmit

coding

error)

transitions

are

synchronously with respect to TXCLK. If TXER is

asserted for one or more clock periods, and TXEN is

asserted, the PHY will emit one or more symbols that

are not part of the valid data delimiter set somewhere in

the frame being transmitted.

•

RXD (receive data) is a nibble (4 bits) of data that are

sampled by the reconciliation sublayer synchronously

with respect to RXCLK. For each RXCLK period which

RXDV is asserted, RXD (3:0) are transferred from the

PHY to the MAC reconciliation sublayer.

•

RXCLK (receive clock) output to the MAC reconciliation

sublayer is a continuous clock that provides the timing

reference for the transfer of the RXDV, RXD, and

RXER signals.

•

RXDV (receive data valid) input from the PHY indicates

that the PHY is presenting recovered and decoded

nibbles to the MAC reconciliation sublayer. To interpret

a receive frame correctly by the reconciliation sublayer,

RXDV must encompass the frame, starting no later

than the Start-of-Frame delimiter and excluding any

End-Stream delimiter.

•

RXER (receive error) transitions are synchronously with

respect to RXCLK. RXER will be asserted for 1 or more

clock periods to indicate to the reconciliation sublayer

that an error was detected somewhere in the frame

being transmitted from the PHY to the reconciliation

sublayer.

•

CRS (carrier sense) is asserted by the PHY when either

the transmit or receive medium is non-idle, and de-

asserted by the PHY when the transmit and receive

medium are idle. Figure 7-2 depicts the behavior of

CRS during 10Base-T and 100Base-TX transmission.

TXD

Preamble

SFD

Data

EFD

Preamble

SFD

Data

ESD

J/K

SSD

T/R

10Base-T

100Base-TX

TXD

CRS

IDLE

Figure 7-2

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