RE: [ethmac] AMBA interface glue logic

["Igor Mohor" <igorm@opencores.org>]

I used single port ram because it is smaller than dual port.
If you want to connect to AMBA, the best thing to do is to
write another interface instead of the wishbone (amba.v).

I don't know if simply changing single port ram to dpram would
suite your needs. Besides that, there are some state machines
in the wishbone.v needed for multiplexing data. You don't need
that, but you can not simply erase that section because signals
are also used in some other equations.

Regards,
	Igor


> -----Original Message-----
> From: owner-ethmac@opencores.org [mailto:owner-ethmac@opencores.org]On
> Behalf Of C.T.Lin
> Sent: 11. marec 2002 12:19
> To: ethmac@opencores.org
> Subject: [ethmac] AMBA interface glue logic
>
>
> Hi, Igor
>     I am planning to adapt wishbone ethernet core to AMBA interface.
>     It seems easy to map Registers and Buffer descriptors
> directly to AMBA APB bus.
>   While the Wishbone master part mapped to AMBA AHB master.
>   But there exist a little problem about the APB bus, because it
> has not any handshake or waitstate.
>   For Registers it's fine. But for Buffer Descriptors, the
> current design use a single port ram which
>   make the timing unpredictable in wishbone. I think it will be
> much simple if dual port ram is used( a delicate
>   port for wishbone and the other for RX and TX). What's your comment?
>
>
>   Best regard!
>                            Chang-Tsun Lin
>
>
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