builing a SPI interface in vhdl

HI, I'm new in FPGA, I have to build a SPI interface (in VHDL) to let
an fpga read and write a flash memory.
The fpga is a Xilinx Spartan3E, while the memory is an ST M25P16
(serial I/O).
Do you know if is there any built vhdl core to start with?

Thanks in advance
Giulio

techG wrote:

> Do you know if is there any built vhdl core to start with?

<http://www.opencores.org>
<http://www.opencores.org/projects.cgi/web/simple_spi/overview>

Regards,

-- 
Mark McDougall, Engineer
Virtual Logic Pty Ltd, <http://www.vl.com.au>
21-25 King St, Rockdale, 2216
Ph: +612-9599-3255 Fax: +612-9599-3266

>HI, I'm new in FPGA, I have to build a SPI interface (in VHDL) to let
>an fpga read and write a flash memory.
>The fpga is a Xilinx Spartan3E, while the memory is an ST M25P16
>(serial I/O).
>Do you know if is there any built vhdl core to start with?
>
>Thanks in advance
>Giulio

The problem with SPI is that it comes in a near-infinity of different
flavours, so IP designed for 1 flavour might be difficult to adapt for a
different flavour.

Good luck! (You will need it)

> The problem with SPI is that it comes in a near-infinity of different
> flavours, so IP designed for 1 flavour might be difficult to adapt for a
> different flavour.

But the OP has a flash memory already specified.

> 
> Good luck! (You will need it)

The SPI interface is fairly trivial (once you've mastered the shift 
register); it's a good project for a beginner.


---
Joe Samson
Pixel Velocity

techG wrote:

> HI, I'm new in FPGA, I have to build a SPI interface (in VHDL) to let
> an fpga read and write a flash memory.
> The fpga is a Xilinx Spartan3E, while the memory is an ST M25P16
> (serial I/O).
> Do you know if is there any built vhdl core to start with?
> 
> Thanks in advance
> Giulio
> 

An SPI interface is really pretty easy to implement.  The major 
difficulty is reading through the device data sheet to make sure you get 
all the details correct.  There are a large number of different flavors 
of SPI, so an interface developed for one application is probably not 
going to be a perfect fit for another.  It is a good beginner's project.

On Oct 26, 12:01 am, Ray Andraka <r...@andraka.com> wrote:
> techG wrote:
> > HI, I'm new in FPGA, I have to build a SPI interface (in VHDL) to let
> > an fpga read and write a flash memory.
> > The fpga is a Xilinx Spartan3E, while the memory is an ST M25P16
> > (serial I/O).
> > Do you know if is there any built vhdl core to start with?
>
> > Thanks in advance
> > Giulio
>
> An SPI interface is really pretty easy to implement.  The major
> difficulty is reading through the device data sheet to make sure you get
> all the details correct.  There are a large number of different flavors
> of SPI, so an interface developed for one application is probably not
> going to be a perfect fit for another.  It is a good beginner's project.

 I agree both of you: this is a very good project for a beginner. Once
you master the shift register the other things become a piece of cake.
Try to use simulator (Modelsim XE) for code simulation and Chipscope
for HW debug. These two tools will eventually save you a lot of time.

Guru

On Oct 25, 9:57 am, techG <giuliopul...@gmail.com> wrote:
> HI, I'm new in FPGA, I have to build a SPI interface (in VHDL) to let
> an fpga read and write a flash memory.
> The fpga is a Xilinx Spartan3E, while the memory is an ST M25P16
> (serial I/O).
> Do you know if is there any built vhdl core to start with?
>
> Thanks in advance
> Giulio

You can try www.opencores.org;
The SPI core interface is quite simple to code up as well.
Cheers

On Oct 30, 6:17 am, futz...@gmail.com wrote:
> On Oct 25, 9:57 am, techG <giuliopul...@gmail.com> wrote:
>
> > HI, I'm new in FPGA, I have to build a SPI interface (in VHDL) to let
> > an fpga read and write a flash memory.
> > The fpga is a Xilinx Spartan3E, while the memory is an ST M25P16
> > (serial I/O).
> > Do you know if is there any built vhdl core to start with?
>
> > Thanks in advance
> > Giulio
>
> You can trywww.opencores.org;
> The SPI core interface is quite simple to code up as well.
> Cheers

i just found a project for SPI controller in opencores.org
(spiflashcontroller)
it's not as simple as I expected, but i found it more useful!
thank you all