PULPissimo eDRAM Emulator

This repository contains the result of the OPRECOMP Summer of Code 2019 project of Marco Widmer.

PULPissimo Port to the Xilinx ZCU104 FPGA Board

This part of the project has already been upstreamed to the PULPissimo repository: pull request

eDRAM Emulator Integration

In this part of the project, the eDRAM emulator from our DAC paper was integrated into PULPissimo.

Documentation

• DAC paper about the emulator: doi
• Presentation about the integration into PULPissimo: doc/presentation/presentation.pdf
• Manual: doc/manual/README.md

How to Use

• Clone the PULPissimo repository and checkout commit f33ecbcf17b2c7fdf3796d352ba3a8689603243f
• Follow the PULPissimo readme to setup your environment and the software SDK
• Apply the RTL patch: git apply rtl/pulpissimo.patch
• Follow the PULPissimo readme to generate the FPGA bitstream for your FPGA board
• Transfer the bitstream to the FPGA using Vivado, start OpenOCD and monitor the serial port
• Run the demo application in apps/demo using GDB

For Developers

RTL Overview

• Emulator top level file: ips/edram_emu/rtl/edram_emu.vhd
• Wrapper: ips/pulp_soc/rtl/pulp_soc/edram_emu_wrap.sv (instanciates both the SRAM and the emulated eDRAM)
• Instantiation: in ips/pulp_soc/rtl/pulp_soc/pulp_soc.sv

RTL Configuration

• Enable the eDRAM emulator: Define PULP_EDRAM_EMUL in rtl/includes/pulp_soc_defines.sv
• Configure the number of SRAM / eDRAM banks: Set NB_L2_CHANNELS in rtl/includes/pulp_soc_defines.sv
• Configure the SRAM bank size: Set L2_BANK_SRAM_SIZE in ips/pulp_soc/rtl/pulp_soc/pulp_soc.sv
• Configure the eDRAM bank size: Set L2_BANK_EDRAM_SIZE in ips/pulp_soc/rtl/pulp_soc/pulp_soc.sv

Contact

The eDRAM emulator project is maintained by the Telecommunications Circuits Laboratory at EPFL. For questions, please contact Andreas Burg.