Beckhoff ET1200 User Manual download pdf (Page 25)

Pin Description

Slave Controller – ET1200 Hardware Description III-15

3.3 General ET1200 Pins

Table 17: General pins

Signal

Configuration

Internal

PU/PD

Name

Dir

Name

Dir

OSC_IN

OSC_OUT

RESET

WPU

RBIAS

TESTMODE

WPD

OSC_IN

Connection to external crystal or oscillator input (25 MHz). An oscillator as the clock source for both

ET1200 and the Ethernet PHY is mandatory if an MII port is used and CLK25OUT cannot be used as

the clock source for the PHY. The 25 MHz clock source should have an initial accuracy of 25ppm or

better.

OSC_OUT

Connection to external crystal. Should be left open if an oscillator is connected to OSC_IN.

RESET

The open collector RESET input/output (active low) signals the reset state of ET1200. The reset state

is entered at power-on, if the power supply is to low, or if a reset was initiated using the reset register

0x0040. ET1200 also enters reset state if RESET pin is held low by external devices.

RBIAS

Bias resistor for LVDS TX current adjustment, should be 11 kΩ connected to GND.

TESTMODE

Reserved for testing, should be connected to GND.

3.4 SII EEPROM Interface Pins

Table 18: SII EEPROM pins

Signal

Configuration

Internal

PU/PD

Name

Dir

Name

Dir

EEPROM_CLK

3.3 kΩ PU

EEPROM_DATA

3.3 kΩ PU

EEPROM_CLK

EEPROM I²C clock signal (open collector output).

EEPROM_DATA

EEPROM I²C data signal (open collector output).

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Beckhoff ET1200 User Manual Page 25

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