RTL8305S Ver la hoja de datos (PDF) - Realtek Semiconductor

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Fabricante

RTL8305S

5-PORT 10/100 MBPS SINGLE CHIP SWITCH CONTROLLER

Realtek Semiconductor 

A brief application for HomePNA and 100Base-FX is depicted below.

3.3V 3.3V 3.3V

RTL8305S

P4MODE[1]

P4MODE[0]

LEDACT[4]

LEDDPX[4]

LEDSPD[4]

RTL8305S

CK25MOUT

P4LNKSTA#

P4SPDSTA#

P4DPXSTA#

P4FLCTRA#

SEL_MIIMAC#

ENP4LED

MII

HomePHY

LED_LINK#

LED_ACT#

LED_COL#

LED_SPD#

3.3V

Common LEDs (RTL8305S driving)

MII MAC mode (UTP / HomeLAN auto-detect)

3.3V 3.3V 3.3V

P4MODE[1]

P4MODE[0]

LEDACT[4]

LEDDPX[4]

LEDSPD[4]

RTL8305S

CK25MOUT

P4LNKSTA#

P4SPDSTA#

P4DPXSTA#

P4FLCTRA#

SEL_MIIMAC#

ENP4LED

MII

Single

PHY

SD+/-

RD+/-

LED_LINK#

LED_ACT#

LED_COL#

LED_SPD#

TD+/-

Fiber Transceiver

3.3V

Common LEDs (RTL8305S driving)

MII MAC mode (UTP / 100Base-FX auto-detect)

As illustrated above, P4LNKSTA# needs to be pulled low to enable the MII MAC port, accompanied with P4MODE[1] pulled

high. An LED connected to SEL_MIIMAC# pin can indicate whether the UTP or MII port is selected.

For 100Base-FX applications, the Link LED status pin can even be wired to P4LNKSTA# to implement the UTP/MII

auto-detection feature with no need to permanently disable port4 UTP capabilities. For the RTL8305S, UTP priority takes over

the MII port if both are link on.

2002/02/19

17

Rev. 1.2

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