Bug-fix for Hitex LPC4357 kit to make RMII autoconfigure correctly

[lpcware]

Content originally posted in LPCWare by rgledhill on Fri May 17 08:07:30 MST 2013

Hi,

There is a mistake on the Hitex LPC4357 kit where resistor R96 is 10k and needs to be 2k2.  This means that the auto-configure mode on the Ethernet PHY always defaults to MII mode, even if jumper JP5 is closed.

You can either change this resistor, or you can change your start-up code to force the PHY into RMII mode (if you want to use RMII mode!).  If you're using the Keil RTX TCPnet libraries, for instance, change ETH_LPC43xx.c:

:

:

            /* Configure the PHY device */
<strong>#if !_MII_ &amp;&amp; defined(HITEX_BOARD)</strong>
<strong>            write_PHY(PHY_REG_RBR, 0x20);   /* RMII mode - fix for Hitex LPC4357 board with inadequate config pull-up R96 */</strong>
<strong>#endif</strong>
#if defined(_10MBIT_)
:

:

This will be fixed in future revisions of the board; MII mode is unaffected.

Richard

Hitex UK Ltd