DM9801A datasheet(13/60 Pages) DAVICOM

Part #	DM9801A

Description	1M Home Phoneline Network Physical Layer Single Chip Transceiver

PDF	60 Pages

Scroll/Zoom	100%

Manufacturer	DAVICOM [Davicom Semiconductor, Inc.]

Direct Link	http://www.davicom.com.tw

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13 / 60 page

DM9801A

1M Home Phoneline Network Physical Layer Single Chip Transceiver

Final

Version: DM9801A-DS-F01

May 30, 2001

MII Interface Transmit and Receive Timing Diagram (continued)

TX_CLK

RX_CLK

TX_EN

TXD

CRS

RXD

COL

RX_DV

5 (Preamble)

DATA

Once TX_EN is asserted, DM9801A stops RX_CLK, asserts CRS, and toggles TX_CLK at 933.3 ns.

TXPKT – TX_EN Asserted

Figure 5

TX_CLK

RX_CLK

TX_EN

TXD

CRS

RXD

COL

RX_DV

DATA

5 (Preamble)

DATA

TX_CLK continues to toggle at 933.3 ns until the SFD is observed, as shown in the first section of the above diagram. At this

point, TX_CLK is disabled (high) until AID header has been transmitted on the wire (or until a COL has been detected). This

takes about 120 us, at which time RX_CLK starts toggling, thereby shifting 32 bits of preamble and SFD back to the MAC.

Sometime later, the TX_CLK restarts as symbols get sent onto the wire in an analogous manner as RX_CLK during packet

reception.

TXPKT – RX_CLK Active

Figure 6

DM9801A Datasheet(PDF) 13 Page - Davicom Semiconductor, Inc.