Using LAN91C111 and LWIP in 16-bit mode?

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originally posted by niosiiuser@Jul 21 2004, 08:48 AM

hello,

currently i’m working with the cyclone development board and the nios ii to evaluate some things for a new system. the new board will be equipped with an epc1c12 in a 240-pqfp package. to save some io pins the compactflash, the standard flash (which stores fpga configuration data and program data) and the ethernet mac/phy (lan91c111) will share the same address and data signals. because the compactflash and the standard flash only need a 16-bit data bus the lan91c111 should also work in 16-bit mode.

which sw/hw changes are needed to use the lan91c111 in 16-bit mode with the stand alone lwip?

thank you in advance,

niosiiuser

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I dont&#39; know what cano you do, but i find this in altera_avalon_lan91c111.c source code of lan91C111 HAL library:

int alt_avalon_lan91c111_init(alt_avalon_lan91c111_if *dev)

{

int ret_code;

if (dev->bus_width != 32)

{

printf("This driver doesn&#39;t support the Ethernet add on card at present\n");

ret_code = -EIO;

goto exit;

}

........

I hope it can help you.