TNETE2004

MDIO-MANAGED QuadPHY

FOUR 10BASE-T PHYSICAL-LAYER INTERFACES

SPWS023D – OCTOBER 1996 – REVISED OCTOBER 1997

32

POST OFFICE BOX 655303

tTDSU

XMTP/

XMTN

TXCLK

NOTES: A. RXCLK is continuous.

B. During a collision, the data output on RXD is not valid received data (or looped-back transmit data) since the digital PLL is acquiring

lock to a different source of incoming data.

TXEN

RXCLK

(see Note A)

CRS

TXD

RXD

(see Note B)

tTFIN

tCRSON

tLOOP

tTDHO

tENSU

tTDLAT

tSUD

Figure 22. Mode 1 Transmit Timing

tTDSU

XMTP/

XMTN

TXCLK

NOTES: A. During a collision, the data output on RXD is not valid received data (or looped-back transmit data) since the digital PLL is acquiring

lock to a different source of incoming data.

B. RXCLK goes high seven clock cycles after CRS goes high.

TXEN

RXCLK

(see Note B)

CRS

TXD

RXD

(see Note A)

tTFIN

tCRSON

tLOOP

tTDHO

tENSU

tTDLAT

tSUD

Figure 23. Mode 2 Transmit Timing