RS7220 Ver la hoja de datos (PDF) - Conexant Systems

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RS7220

Home Networking Physical Layer Device with Integrated Analog Front End Circuitry

Conexant Systems 

Home Networking PHY with Integrated AFE

TxPKT  HLAN_RX_CLK Active

HLAN_TX_CLK

HLAN_TX_EN

HLAN_TXD

LANfinity™ CN7221

HLAN_RX_CLK

HLAN_CRS

HLAN_RXD

HLAN_COL

HLAN_TX_CLK continues to toggle at 233.3ns until the SFD is observed, as shown in the first section of the above diagram. At

this point, HLAN_TX_CLK is disabled (high) until the AID header has been transmitted on the wire (or until a HLAN_COL has

been detected). This takes about 120us, at which time HLAN_RX_CLK starts toggling, thereby shifting 32 bits of preamble and

SFD back to the MAC. Sometime later, the HLAN_TX_CLK restarts as symbols get sent onto the wire in an analogous manner

as HLAN_RX_CLK during packet reception.

TxPKT  HLAN_TX_EN Cleared

HLAN_TX_CLK

HLAN_TX_EN

HLAN_TXD

HLAN_RX_CLK

HLAN_CRS

HLAN_RXD

HLAN_COL

Once HLAN_TX_EN is cleared, the last symbol gets encoded and transmitted, the looped-back data is presented back to the

MAC, and about 22us later, HLAN_CRS falls. Once HLAN_CRS falls, HLAN_TX_CLK and HLAN_RX_CLK toggle with a period of

233.3ns for 97 clocks, after which the system returns to the Idle state.

LAN-056, Rev. A

Conexant

7

PROPRIETARY INFORMATION

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