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Merge branch 'dev' of https://github.com/LNIS-Projects/OpenFPGA into dev

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Baudouin Chauviere 2019-07-16 13:37:21 -06:00
parent 69014704ef 509c1d2c80
commit 65122d04b3
2 changed files with 2 additions and 2 deletions
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2
fpga_flow/tuto_fpga_flow.sh
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@ -18,7 +18,7 @@ dir_keyword="GENERATED_DIR_KEYWORD"
rm -rf ${pwd_path}/results_OpenPithon
cd ${pwd_path}/arch
mkdir generated # create folder to save rewritten architecture
mkdir -p generated # create folder to save rewritten architecture
cd ${pwd_path}/scripts
# Replace keyword in config and architecture files

2
tutorials/fpga_flow/how2use.md
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@ -93,4 +93,4 @@ Once dependancies are understood, we can modify the flow by changing the archite
### Explanation
With this last experiment we replace the [**K6 architecture**](https://github.com/LNIS-Projects/OpenFPGA/blob/master/tutorials/image/architectures_schematics/frac_lut6.pdf) with a [**K8 architecture**](https://github.com/LNIS-Projects/OpenFPGA/blob/master/tutorials/image/architectures_schematics/frac_lut8.pdf), which means a 8-inputs fracturable LUT (implemented by LUT6 and LUT4 with 2 shared inputs). This architecture provides more modes for the CLB and the crossbar changed from a half-connected to a fully connected, implying bigger multiplexor between the CLB and LUT inputs. These requirement in term of interconnection will lead to the increase in routing channel width. Indeed, if the routing channel is to low, it could be impossible to route a benchmark or the FPGA output can be delayed.
With this last experiment we replace the [**K6 architecture**](https://github.com/LNIS-Projects/OpenFPGA/blob/master/tutorials/images/architectures_schematics/frac_lut6.pdf) with a [**K8 architecture**](https://github.com/LNIS-Projects/OpenFPGA/blob/master/tutorials/images/architectures_schematics/frac_lut8.pdf), which means a 8-inputs fracturable LUT (implemented by LUT6 and LUT4 with 2 shared inputs). This architecture provides more modes for the CLB and the crossbar changed from a half-connected to a fully connected, implying bigger multiplexor between the CLB and LUT inputs. These requirement in term of interconnection will lead to the increase in routing channel width. Indeed, if the routing channel is to low, it could be impossible to route a benchmark or the FPGA output can be delayed.