W5100 datasheet(10/72 Pages) WIZNET

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1.1 MCU Interface Signals

Symbol

Type

Pin No

Description

/RESET

RESET

This pin is active Low input to initialize or re-initialize

W5100.

By asserting this pin low for at least 2us, all internal

registers will be re-initialized to their default states.

ADDR14-0

38,39,40

,41,42,45

,46,47,48

,49,50,51

,52, 53,54

ADDRESS

These pins are used to select a register or memory.

Address pins are internally pulled down.

DATA7-0

I/O

19, 20,

21, 22,

23, 24,

25, 26

DATA

These pins are used to read and write register or

memory data.

/CS

CHIP SELECT

Chip Select is for MCU to access to internal registers or

memory. /WR and /RD select direction of data transfer.

This pin is active low.

/INT

INTERRUPT

This pin Indicates that W5100 requires MCU attention

after socket connecting, disconnecting, data receiving or

timeout. The interrupt is cleared by writing IR(Interrupt

interrupts are maskable. This pin is active low.

/WR

WRITE ENABLE

Strobe from MCU to write an internal register/memory

selected by ADDR[14:0]. Data is latched into the W5100

on the rising edge of this input. This signal is active low.

/RD

READ ENABLE

Strobe from MCU to read an internal register/memory

selected by ADDR[14:0]. This signal is active low.

SEN

SPI ENABLE

This pin selects Enable/disable of the SPI Mode.

Low = SPI Mode Disable

W5100 Datasheet(PDF) 10 Page - WIZnet Co., Ltd

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