RTL8308B Просмотр технического описания (PDF) - Realtek Semiconductor

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RTL8308B

REALTEK SINGLE CHIP 8-PORT 10/100 ETHERNET SWITCH CONTROLLER WITH EMBEDDED MEMORY

Realtek Semiconductor 

RTL8308B

MDIO

I/O

44

Management Data Input/Output: This pin is used during the

MII setup process. The whole setup sequence will set Register

4h, address 16-20 of the PHY to 05E1h, REGISTER 0h to

value 1200h. It also advertises 100/10 full duplex with pause

capability & enables auto-negotiation. Sending after reset

signal release about 1.6ms.

This pin is Tri-state at reset.

5.2 Serial EEPROM 24LC02 Interface

Symbol

SCLK

Type

O

SDA

I/O

Pin No

121

122

Description

Serial Clock: Internally pulled high, this pin is used to enable

data transfers from the EEPROM to the controller.

This output is used to clock the serial EEPROM inputs and

outputs. It operates at 1.6us or 625KHz.

Serial Data Input/Output: Internally pulled high, this pin is

used to obtain configuration data from the external serial

EEPROM after reset. The data is synchronized by MDC.

5.3 System Pins

Symbol

RST#

Type

I

SYSCLK

I

Pin No

53

119

Description

Reset: Active low to a known reset state. After power-on reset

(low to high), the configuration modes from Mode Pins are

determined. Then, the contents of the serial EEPROM is

auto-loaded into and the RTL8308B, which begins to access

the management data of PHY devices.

System clock input: The same 50 MHz clock as REFCLK is

used.

5.4 Mode Pins (Reset-Read)

Symbol

ENBrdCtrl

ENCUTHR

ENBKPRS

ENFCTRL

Type

I

I

I

I

Pin No

108

117

107

112

Description

Enable Broadcast Storm Control detection: Pulled low

internally by default, Broadcast Storm Control is disabled. When

pulled high upon reset, Broadcast Storm Control is enabled.

Enable Cut-through: Pulled low internally by default,

cut-through is disabled. When pulled high upon reset,

Cut-through is enabled.

Enable Half duplex back pressure function: Pulled low

internally by default, back pressure is enabled. When pulled

low upon reset, back pressure is disabled.

Enable Full Duplex Flow Control: Pulled low internally by

default, Flow Control is enabled. The flow control ability will

write to management register 4 of PHY device one and only

one time after power-on reset, for advertising. When pulled

low upon reset, the flow control function will be disabled.

2002/01/23

7

Rev. 2.0

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