> -----Original Message----- > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf > Of Xiaofan Chen > Sent: 23 September 2006 02:40 > To: Microcontroller discussion list - Public. > Subject: Re: [EE] SPI to 2-wire asynchronous serial converter > > > On 9/22/06, peter green wrote: > > why can't you just implement spi on the fpga? > > > Oh I need to have many isolated channels and I can not afford > the space and cost of an FPGA every channel. In can however > afford an FPGA to process these many channels of data in > the other side of the opto isolation. if you wan't to try a cpld i suggest you whip up a design in whatever tool you are currently using (most manufacturers tools work for both thier fpgas and cplds). Then see how small you can go with the target chip and still synthisize it successfully. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist