W5100 WIZnet, W5100 Datasheet - Page 61

• Manufacturer Part Number: W5100
• Description: Ethernet ICs 3-IN-1 ENET CONTR TCP/IP+MAC+PHY
• Manufacturer: WIZnet

Specifications of W5100

• Rohs: yes
• Product: Ethernet Controllers
• Data Rate: 10 Mb/s, 100 Mb/s
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 3 V
• Maximum Operating Temperature: + 80 C
• Package / Case: LQFP-80
• Ethernet Connection Type: 10Base-T, 100Base-TX
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Standard Supported: 802.3, 802.3u

© Copyright 2009-2010 WIZnet Co., Inc. All rights reserved.
In order to read or write the internal register or internal TX/RX Memory,
In order to read or write the data on the sequential address, set AI bit of MR(Mode Register).
With this, user performs above 1 only one time. Whenever read or write IDM_DR, IDM_AR , the
value is automatically increased by 1. Therefore, the value can be processed on the
sequential address just by continuous reading or writing of IDM_DR.
6.3 SPI (Serial Peripheral Interface) mode
Serial Peripheral Interface Mode uses only four pins for data communication.
Four pins are SCLK, /SS, MOSI, MISO.
At the W5100, SPI_EN pin is used for SPI operation.
Value
0x00
0x01
0x02
0x03
1. Write the address to read or write on IDM_AR0, 1.
2. Read or Write IDM_DR.
IDM_AR0
IDM_AR1
IDM_DR
Symbol
MR
It performs the selection of Indirect bus I/F mode, address
automatic increase. Refer to “4. Register Description” for more
detail.
Indirect bus I/F mode address Register
Big-endian use only
Indirect bus I/F mode data Register
· In case of Big-endian ordering
0x01
IDM_AR0 : MSB
Ex) In case of reading S0_CR(0x0401),
0x01(IDM_AR0)
0x04
Description
0x02(IDM_AR1)
0x02
IDM_AR1 : LSB
0x01
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