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THE ETHERNET DEVELOPMENT BOARD

Part 2: The Software and Firmware Exposed
by Fred Eady

Start ý The Basics ý Registers ý Bus Interface Registers ý Status and Control Registers ý InitChip ý Initiate Transmit Registers ý Address Filter Registers ý Receive and Transmit Frame Locations ý CS8900A-CQ Transmit and Receive Operations ý The Next Read ý Broadcast ý ARP ý No Cheating ý Tiger Woodsý Putter ý Whatýs the Point? ý And It Programs, Too! ý Sources and PDF

TIGER WOODSý PUTTER

ARP and UDP are the basic set of protocols the Ethernet development board uses to move data over the ether. If you know absolutely nothing about Internet protocols, youýve probably heard someone talking about "pinging" someone elseýs computer. Ping is actually an application of sorts that is based on the ICMP protocol. Itýs a quick and nasty way to establish that a remote host is online. I wonýt go into detail because Photos 11 and 12 pretty much tell the story. But, while Iým already on the subject, I can tell you ping is incorporated in the Ethernet development board firmware. Photo 13 shows the ping command being given from a Windows98 DOS screen to the Ethernet development board running under PICMASTER control.

Photo 13ýThis ping ran against the code running on the PICMASTER at 10 MHz. Notice at the top of the screen, I had not yet started the code when the ping failed. (enlarge)

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