LWIP bandwidth and timing tests

These tests were performed with LPCOpen v1.03 on a Linux desktop host (1GBPS) and a target board (100MBPS) with a 1GBPS switched between host and board.

Question:
If the RMII interface is provided to the physical transmission medium (PHY) and this provided a reference clock to the MAC (that is integrated into the microcontrollers) and operated at a tenth of the expected speed (i.e. 5MHz), would everything still work (the data communication system is intended to operate as 10Mb/s Ethernet, but at reduced data rate of 1Mb/s)?

Answer:
Running at a slower reference clock should still work, however it is not guaranteed.

Please see http://lpcware.com/content/blog/lpc2300-and-lpc2400-rev-b-rev-d-change-e... for details regarding the change from Rev B to Rev D silicon differences.

Reading part IDs are the recommended way of determining the MAC IDs on different parts.

The Ethernet PHY configuration is a one-time event. Once the configuration has been completed using MDIO and MCLK, these pins will no longer be required. It will then be possible to switch the pin function to USB.
Another option is to use Ethernet MII Management (MDIO) using software. This is described in Application note AN10859.
http://www.lpcware.com/content/nxpfile/an10859-lpc1700-easyweb
If MDIO is implemented in software, there will be no need to share pins between USB and Ethernet.

Ethernet bootloaders are available as part of the Flash Magic tool ( www.flashmagictool.com). After installing Flash Magic, you can find the bootloader in the Flash Magic\Ethernet Bootloader directory (C:\Program Files (x86)\Flash Magic\Ethernet Bootloader in a Windows x64 environment). An application note is available for download from http://www.lpcware.com/content/nxpfile/an10744-ethernet-secondary-isp-bo...

uEZ® (pronounced muse) is an 

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