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====== Arduino Ethershield SD (version 1) ======

===== Versions =====
  * **Old / clones / Version 1** : WIZ5100 chipset → {{https://www.arduino.cc/en/Reference/Ethernet|Arduino "Ethernet" library}}
  * **Modern / Adafruit shields / Version 2** : WIZ5500 chipset → "Ethernet2" library

===== Arduino Documentation =====
➯ https://www.arduino.cc/en/Main/ArduinoEthernetShieldV1
  * Requires an Arduino board
  * Operating voltage 5V (supplied from the Arduino Board)
  * Ethernet Controller: W5100 with internal 16K buffer
  * Connection speed: 10/100Mb
  * Connection with Arduino on SPI port

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==== Wiznet 5100 ====
  * https://www.wiznet.io/product-item/w5100/
  * {{ :documentation:microcontroleurs:arduino:modules:network_shields:ethershieldsd:w5100_datasheet_v1_1_6.pdf |Wiznet 5100 Datasheet}}
  * All-in-one Ethernet Controller : Hardware TCP/IP, MAC & PHY
  * Fully hardwired network protocol
  * Direct & Indirect Bus and SPI for Host Interface
  * Stable Data Communication

=== Key Features ===
  * Hardwired TCP/IP protocols : TCP, UDP, ICMP, IPv4, ARP, IGMP, PPPoE
  * Un-attackable hardware network engine for preventing network attacks such as flooding, spoofing, injection
  * Host Interface : Direct/Indirect Bus & Serial Peripheral Interface (SPI MODE 0, 3)
  * 4 Independent hardware socket
  * Internal 16Kbytes memory for TCP/IP packet processing
  * 10BaseT / 100Base TX Ethernet PHY Embedded
  * Support Auto-Negotiation (Full & Half Duplex, 10 & 100 Based)
  * Support Auto-MDIX
  * 3.3V Operation with 5V I/O signal tolerance
  * LED outputs (TX, RX, full/half duplex, Collision, link, speed)
  * 80LQFP lead-free package (10x10mm)