Do you know where I can buy some of HM1175? Who makes it? Friendly Regards Octavio Nogueira =================================================== nogueira@propic2.com ICQ# 19841898 ProPic tools - low cost PIC programmer and emulator http://www.propic2.com =================================================== ----- Original Message ----- From: "Peter L. Peres" To: Sent: Tuesday, September 25, 2001 6:00 PM Subject: Re: [PIC]: High speed sampling --> data storage > You don't need to refresh DRAM while you are reading or writing from/to > it, just make sure your operations visit a whole DRAM page within the > required time (i.e. 128 or 256 or 512 operations in a row within 4 or 8 > msec - easy). > > A quick and sneaky way out of the pin maze for a fast data sampler is a > FIFO RAM combined with continuous flash A/D like HM1175 and friends or > higher. The FIFO has only write, read, clock, and reset pins beyond the > data path, which is 4 or 8 or 16 bits wide. All you need to do is to > connect the AD clock and the FIFO clock together and supply /WR to the > FIFO with correct phase (every clock cycle). This yields a 40MSPS sampler > (using HM1175 etc). There are other options. The address counter is in the > FIFO and it is reset at the beginning. > > The only problem is getting hold of FIFOs. They are used in some high end > network and video cards and some are unbelievably fast. Try to find > something suitable. > > Peter > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.