[rtl] Trim rf_reg addresses for RV32E #1829
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Fix for array index out of range with rv32e configuration.
vogelpi
reviewed
Oct 4, 2022
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Thanks @ANurmi for your PR!
This commit obviously fixes an issue when using RV32E but I think it would actually be better to just parameterize the regfile address widths. However this will be much more invasive. I am not sure what's better. I need to discuss this with the team.
rtl/ibex_register_file_ff.sv
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| assign rdata_a_o = rf_reg[raddr_a_i]; | ||
| assign rdata_b_o = rf_reg[raddr_b_i]; | ||
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| if(RV32E) begin : rv32e_regfile |
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I think the missing whitespace between if and (RV32E here causes lint to fail. Can you please run
fusesoc --cores-root . run --target=lint --tool=veriblelint lowrisc:ibex:ibex_top_tracing --RV32E=0 --RV32M=ibex_pkg::RV32MFast --RV32B=ibex_pkg::RV32BNone --RegFile=ibex_pkg::RegFileFF --BranchTargetALU=0 --WritebackStage=0 --ICache=0 --ICacheECC=0 --ICacheScramble=0 --BranchPredictor=0 --DbgTriggerEn=0 --SecureIbex=0 --PMPEnable=0 --PMPGranularity=0 --PMPNumRegions=4 --MHPMCounterNum=0 --MHPMCounterWidth=40
to check?
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Use trimmed address values to match the 16 registers in RV32E configuration. This fixes top level IbexDataReqPayloadX assert that was being triggered during LW instruction execution with IMM value 'h10 in rs2 register.