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_ && 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>
This will be fixed in future revisions of the board; MII mode is unaffected.
Hitex UK Ltd