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Altera_Forum
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21 years ago

Using LAN91C111 and LWIP in 16-bit mode?

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

7 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    --- Quote Start ---

    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

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=521)

    --- quote end ---

    --- Quote End ---

    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.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    20 years ago

    Hi,

    I have the same problem when using Nir&#39;s Opencores MAC functions... can u pl tell me how to solve it?

    Raghu
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    20 years ago

    --- Quote Start ---

    originally posted by tns1@Feb 24 2006, 12:48 PM

    it has been done several times:

    http://forum.niosforum.com/forum/index.php...st=&#entry10776 (http://forum.niosforum.com/forum/index.php?showtopic=2788&pid=10776&mode=threaded&show=&st=&#entry10776)

    if the link does not work just search lan91c111

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=12953)

    --- quote end ---

    --- Quote End ---

    I wish some friendly sould posted the corrected driver for the Nios II comunity. Just to avoid doing this yet another time... I would really appreciate this.

    It would be really great if Altera included this fixed driver in their standard installation. I know, I am just dreaming.

    Anyway - anybody would like to share his/her 16-bit driver for LAN91C111?
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    20 years ago

    --- Quote Start ---

    originally posted by pszemol+mar 25 2006, 12:07 am--><div class='quotetop'>quote (pszemol @ mar 25 2006, 12:07 am)</div>

    --- quote start ---

    <!--quotebegin-tns1@Feb 24 2006, 12:48 PM

    it has been done several times:

    http://forum.niosforum.com/forum/index.php...st=&#entry10776 (http://forum.niosforum.com/forum/index.php?showtopic=2788&pid=10776&mode=threaded&show=&st=&#entry10776)

    if the link does not work just search lan91c111

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=12953)

    --- quote end ---

    --- Quote End ---

    I wish some friendly sould posted the corrected driver for the Nios II comunity. Just to avoid doing this yet another time... I would really appreciate this.

    It would be really great if Altera included this fixed driver in their standard installation. I know, I am just dreaming.

    Anyway - anybody would like to share his/her 16-bit driver for LAN91C111?

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=13784)</div>

    [/b]

    --- Quote End ---

    The driver has already been posted

    http://forum.niosforum.com/forum/index.php?act=st&f=15&t=466 (http://forum.niosforum.com/forum/index.php?act=st&f=15&t=466)
  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    I&#39;ve found to make the LAN91c111 really work as a 16 bit device

    on the Nios2 development board, one has to modify the file "class.ptf"

    in the altera_avalon_lan91c111 component folder.

    When the &#39;LAN91C111 MAC/PHY On Daughtercard&#39; option is chosen then

    specifically these sections matter the most:

    $SPW/PORT byteenablen/width = "2";

    $SPW/PORT address/width = "15";

    $SPW/PORT data/width = "16";

    $SBI/Data_Width = "16";

    $SBI/Address_Width = "15";

    $CONSTANTS/CONSTANT LAN91C111_REGISTERS_OFFSET/value = "0x0300";

    $CONSTANTS/CONSTANT LAN91C111_DATA_BUS_WIDTH/value = "16";

    After that the posted driver works great.
  • Altera_Forum's avatar
    Altera_Forum
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    19 years ago

    Because the CompactFlash and the standard Flash only need a 16-bit data bus the LAN91C111 should also work in 16-bit mode

    i think you idea is not correct, the LAN91C111 can still work in 32-bit because the AVALON can suited it.yes or no??