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

lpcware — Wed, 15 Jun 2016 18:52:12 GMT

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

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

Richard

Hitex UK Ltd

topic Bug-fix for Hitex LPC4357 kit to make RMII autoconfigure correctly in LPC Microcontrollers

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