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Comp.Arch.FPGA | SDRAM controller
There are 5 messages in this thread.
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SDRAM controller - FP - 2008-06-09 10:22:00
I am looking for a SDRAM controller for Xilinx Spartan3 device in Verilog. xapp 134 has one which targets virtex 2 devices. Xilinx MIG can be used for DDR and DDR2 SDRAMs. Can a DDR SDRAM controller be used to drive SDR SDRAM? What other options do I have?
Re: SDRAM controller - Nico Coesel - 2008-06-09 13:30:00
FP <F...@gmail.com> wrote: >I am looking for a SDRAM controller for Xilinx Spartan3 device in >Verilog. xapp 134 has one which targets virtex 2 devices. Xilinx MIG >can be used for DDR and DDR2 SDRAMs. Can a DDR SDRAM controller be >used to drive SDR SDRAM? Yes, with some minor modifications this should be possible. But beware, there are no usefull free DDR controllers available for the Spartan3 series. -- Programmeren in Almere? E-mail naar nico@nctdevpuntnl (punt=.)
Re: SDRAM controller - PFC - 2008-06-09 13:34:00
> I am looking for a SDRAM controller for Xilinx Spartan3 device in > Verilog. xapp 134 has one which targets virtex 2 devices. Xilinx MIG > can be used for DDR and DDR2 SDRAMs. Can a DDR SDRAM controller be > used to drive SDR SDRAM? > What other options do I have? I need this SDRAM controller too. There are some on OpenCores, but with gotchas.______________________________
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Re: SDRAM controller - Eric Smith - 2008-06-09 16:35:00
FP wrote: > Can a DDR SDRAM controller be used to drive SDR SDRAM? No, unless it is a combined DDR/SDR controller, and those aren't common. > What other options do I have? An SDR DRAM controller.
Re: SDRAM controller - Martin Thompson - 2008-06-10 04:28:00
FP <F...@gmail.com> writes: > I am looking for a SDRAM controller for Xilinx Spartan3 device in > Verilog. xapp 134 has one which targets virtex 2 devices. Xilinx MIG > can be used for DDR and DDR2 SDRAMs. Can a DDR SDRAM controller be > used to drive SDR SDRAM? > What other options do I have? Write one? Assuming you have relatively modest performance requirements (which seems reasonabnle, or you'd be using DDR), it's not a huge task. My first significant piece of VHDl was an SDRAM controller, years ago using a FLEX10KE part! SDR is really not that complicated, and the timing is fairly easy for modern devices to handle. Cheers, Martin -- m...@trw.com TRW Conekt - Consultancy in Engineering, Knowledge and Technology http://www.conekt.net/electronics.html