Hi Matt, On Mon, Jan 24, 2011 at 21:42, Matt Ettus <[email protected]> wrote: > On 01/24/2011 10:30 AM, Alexander Chemeris wrote: >> Is there any high-level description of what processing is done in FPGA >> in E100 and is there any optional blocks which can be removed? I see >> that even aeMB is present in the project - is it used or it is not >> compiled in? > > There is no aeMB in the E100, although it is in the Makefiles since we share > the makefiles among the various projects. The current E100 FPGA has a > similar structure to the USRP2 except that the aeMB is replaced by an > interface to the GPMC. So there are the usual digital up and > downconverters, decimators, and interpolators for DSP, and SPI, I2C, > wishbone, etc. for control. The u1e_core.v file is the place to look for > the top level.
Great. So the makefile confused me. >> I need to understand how much resource is left for custom DSP >> processing in the FPGA. We're working on an (open-source) WiMAX >> receiver and want to offload a lot of work to FPGA. But from design >> summary (below) it looks like FPGA is pretty much crowded already. > > The logic area is 60-70% free. You should ignore the "number of occupied > slices" metric as that is not really meaningful. > > 81% of the DSP units and 52% of the memory are free. The bulk of the memory > currently used is for buffering and can be trimmed if you need more of it. > > Additionally, in March or April we will have the E110 which is the same > except that it uses an even bigger FPGA, the -3400 version. Yes, I know about E110 and I'm looking forward to try it out, but we'll start with E100 as we don't want to wait until March/April. We're also looking into using USRP N210 and processing data with external DSP like Freescale StarCore MSC8156. But we keep this as a backup plan as it's more expensive and power hungry. Thank you for your kind answer. -- Regards, Alexander Chemeris. http://www.fairwaves.ru _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
