why can't you just implement spi on the fpga?

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
> Of Xiaofan Chen
> Sent: 23 September 2006 02:05
> To: Microcontroller discussion list - Public.
> Subject: [EE] SPI to 2-wire asynchronous serial converter
> 
> 
> I need to get some data from a SPI interface 16bit ADC and transfer
> them through a 2 wire serial communication to a large signal processing
> MCU/FPGA. If the data rate is not so high (say 2ksps, 16bit data 
> -->32k bps),
> I could use a small MCU like PIC/MSP430/AVR to do it. I could also use a
> not-so-big MCU like an ARM7 to process the data.
> 
> If the data rate is high (say 20ksps from 16bit SAR ADC,
> the data rate will be 320k bps). Perhaps a small MCU will not be able to
> do the job.
> 
> I am not so familiar with CPLDs. Now I have some questions on the
> possibility of using a small CPLD for this specific application.
> 
> How small this CPLD can be? Any recommendations?
> 
> I understand that the high data rate will also require a big MCU or
> DSP or FPGA to process the data if I want to do some digital filtering.
> But that is the next question...
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