Summary of EMBEDDED RTL8019AS WEB SERVER PROJECT ATMEGA103
The article describes an embedded web server project using an ATMega103 microcontroller and an RTL8019AS Ethernet card. The system connects via a 8-bit data bus to two processor ports, utilizing ISA slots. To minimize cost and complexity, external memory was omitted, resulting in a simplified TCP/IP implementation that handles packets but lacks full security mechanisms or error recovery defined in RFC793.
Parts used in the AVR Web Server Project:
- Atmel ATMega103 microcontroller
- RTL8019AS chip set
- ISA Ethernet card
- 8-bit data bus
- Two 8-bit ports of the processor
- ISA slots
I quickly was able to appeal to the network card via a 8-bit data bus. The connectivity of the network card and thus the RTL8019AS chip via two 8-bit ports of the processor and… Electronics Projects, Embedded RTL8019AS Web Server Project ATMega103 “avr project, microcontroller projects, “
I quickly was able to appeal to the network card via a 8-bit data bus. The connectivity of the network card and thus the RTL8019AS chip via two 8-bit ports of the processor and an ISA slots. On external components such as memory was deliberately omitted from the beginning to keep the replica easy and the costs as low as possible. This of course had disadvantages in the implementation of the TCP / IP stack. The TCP implementation has been reduced to the extent that one can hardly speak of TCP / IP stack. The data are received and answered Packet way. Also, TCP security mechanisms due to the memory not implemented. The web server is therefore being able to answer incoming questions and to make web pages, but can not respond to transmission errors as defined in the TCP standard [RFC793].
AVR WEB SERVER
To select came an ISA Ethernet card and processor as an Atmel ATMega128 which I had already gained some experience in question. My attention much on an ISA Ethernet card with RTL8019AS chipset, because it do so by the manufacturer Realtek gave a good documentation and the chip had a 16/8Bit interface itself. This ISA Ethernet cards with the RTL8019AS chip set are to have auctions worldwide for more than 5 € at the relevant Internet today.
Source: https://320volt.com/en/rtl8019as-ve-atmega103-ile-web-server/ AVR Webserver schematic pcb source code files alternative link: embedded-rtl8019as-web-server-project-atmega103.rar alternative link2, link3
- How is the network card connected to the processor?
The connectivity uses two 8-bit ports of the processor and an ISA slot via a 8-bit data bus. - Why were external components like memory omitted?
External components were omitted to keep the replica easy and costs as low as possible. - Does the project implement a full TCP / IP stack?
No, the TCP implementation is reduced so far that one can hardly speak of a TCP / IP stack. - Can the web server respond to transmission errors defined in the TCP standard?
No, the web server cannot respond to transmission errors as defined in the TCP standard [RFC793]. - What chipset was chosen for the ISA Ethernet card?
The author selected an ISA Ethernet card with the RTL8019AS chipset due to good documentation and a 16/8Bit interface. - What is the approximate cost of the ISA Ethernet cards mentioned?
These cards are available at auctions worldwide for more than 5 €. - Which microcontroller was selected for this project?
An Atmel ATMega128 was considered, but the project title and source indicate the use of an ATMega103.
