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phdegen / object_detection_on_zynq_mpsoc

MIT License
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Design exceeds number of LUTs #2

Open mpFPGA opened 6 years ago

mpFPGA commented 6 years ago

Hi Philippe, I'm trying to implement your design on a ZCU102 board using SDSoC 2017.4. I am experiencing some issues with the acceleration of conv3x3, since the required number of LUTs is greater than the available resources, as shown in the following image utilization_estimates Moreover, it seems that Vivado HLS is ignoring pragmas for DSP usage, also the one inserted by you (#pragma HLS RESOURCE variable=out core=AddSub_DSP), giving error in this form: WARNING: [SYN 201-303] Cannot apply functional unit assignment of 'AddSub_DSP' (/xilinx/workspace/obj_det/src/hw_convs.c:640->/xilinx/workspace/obj_det/src/hw_convs.c:404) on 'select' operation ('p_load_1', /xilinx/workspace/obj_det/src/hw_convs.c:640->/xilinx/workspace/obj_det/src/hw_convs.c:404) due to incompatible operation sets. Did you experienced similar problems or do you have any ideas to solve it? Thanks for your attention

phdegen commented 6 years ago

Hi I certainly encountered such a design, but the one given in the repository should work fine. As stated in the doc, the design was compiled with 2016.3 . During my thesis I also ran some iterations with 2017.1 (I think) and I got some results that did not convince me as I remember.

It looks like it isn't using its available DSP blocks and tries to generate them with logic for some reasons. I would investigate that. Maybe this can be achieved in 2017.4 in another way...

mpFPGA commented 6 years ago

Thanks, I'll concentrate my efforts to figure out why some pragmas are ignored