[En-Nut-Discussion] Ethernut 2 with RTL8019AS

[Zdenek Hanak jr.]

Trying repeat the topic (no discussion has started) ...

> Hi everyone,
> 
> I am new in your group and I'd like to design new
> board based on Ethernut 2 but with RTL8019AS.
> 
> More detailed, from Ethernut 2 reference design I want
> use CPU (changed to AT90CAN128), Xilinx (without change), DataFlash 
> (without change), 512kB SRAM (without change), RTL8019AS (may be 
> addressing change).
> 
> My question is about the structure of external RAM space.
> 
> Space 0x0000-0x7FFF address internal SRAM and first
> almost 32kB external SRAM.
> Space 0x8000-0xBFFF address remaining external SRAM banks access.
> Space 0xC000-0xFEFF I want use for NIC addressing (using NIC_CS
> signal from Xilinx).
> Space 0xFF00-0xFFFF for bank swithing.
> 
> I hope this structure of address space is possible.
> Can anyone help me with connection address pins of RTL8019AS ?
> 
> Is this connection of address bits of RTL possible/right ?
> - SA0-SA14 to A0-A14
> - SA15 to NIC_CS from Xilinx
> - SA16-SA19 to GND
> 
> In this case, the base address of RTL is 0xC000, 0xC300 or something
> another ?
> I am not familiar yet with the NutOS code. There is address
> of RTL fixed to 0x8300 or it is correctly adjustable ? I have found
> only constant inside the realtek.c for example...
> 
> Thanks.
> Zdenek


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