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Separated busdp for cache from simpler logic for no cache

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This commit is contained in:
David Harris 2022-08-25 17:54:04 -07:00
parent 5c1934208a
commit 0b918d6916
2 changed files with 38 additions and 16 deletions
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48
pipelined/src/lsu/lsu.sv
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@ -224,6 +224,18 @@ module lsu (
logic DCacheBusAck; logic DCacheBusAck;
logic [LOGBWPL-1:0] WordCount; logic [LOGBWPL-1:0] WordCount;
if(`DCACHE) begin : dcache
cache #(.LINELEN(`DCACHE_LINELENINBITS), .NUMLINES(`DCACHE_WAYSIZEINBYTES*8/LINELEN),
.NUMWAYS(`DCACHE_NUMWAYS), .LOGBWPL(LOGBWPL), .WORDLEN(`LLEN), .MUXINTERVAL(`XLEN), .DCACHE(1)) dcache(
.clk, .reset, .CPUBusy, .SelBusWord, .RW(LSURWM), .Atomic(LSUAtomicM),
.FlushCache(FlushDCacheM), .NextAdr(LSUAdrE), .PAdr(LSUPAdrM),
.ByteMask(ByteMaskM), .WordCount,
.FinalWriteData(LSUWriteDataM), .Cacheable(CacheableM),
.CacheStall(DCacheStallM), .CacheMiss(DCacheMiss), .CacheAccess(DCacheAccess),
.IgnoreRequestTLB, .TrapM, .CacheCommitted(DCacheCommittedM),
.CacheBusAdr(DCacheBusAdr), .ReadDataWord(ReadDataWordM),
.FetchBuffer, .CacheFetchLine(DCacheFetchLine),
.CacheWriteLine(DCacheWriteLine), .CacheBusAck(DCacheBusAck), .InvalidateCache(1'b0));
busdp #(WORDSPERLINE, LINELEN, LOGBWPL, `DCACHE) busdp( busdp #(WORDSPERLINE, LINELEN, LOGBWPL, `DCACHE) busdp(
.clk, .reset, .clk, .reset,
.HRDATA, .BusAck(LSUBusAck), .BusInit(LSUBusInit), .BusWrite(LSUBusWrite), .HRDATA, .BusAck(LSUBusAck), .BusInit(LSUBusInit), .BusWrite(LSUBusWrite),
@ -238,20 +250,30 @@ module lsu (
.s(SelUncachedAdr), .y(ReadDataWordMuxM)); .s(SelUncachedAdr), .y(ReadDataWordMuxM));
mux2 #(`XLEN) LSUHWDATAMux(.d0(ReadDataWordM[`XLEN-1:0]), .d1(LSUWriteDataM[`XLEN-1:0]), mux2 #(`XLEN) LSUHWDATAMux(.d0(ReadDataWordM[`XLEN-1:0]), .d1(LSUWriteDataM[`XLEN-1:0]),
.s(SelUncachedAdr), .y(LSUHWDATA)); .s(SelUncachedAdr), .y(LSUHWDATA));
if(`DCACHE) begin : dcache end else begin : passthrough // just needs a register to hold the value from the bus
cache #(.LINELEN(`DCACHE_LINELENINBITS), .NUMLINES(`DCACHE_WAYSIZEINBYTES*8/LINELEN), logic BufferCaptureEn;
.NUMWAYS(`DCACHE_NUMWAYS), .LOGBWPL(LOGBWPL), .WORDLEN(`LLEN), .MUXINTERVAL(`XLEN), .DCACHE(1)) dcache(
.clk, .reset, .CPUBusy, .SelBusWord, .RW(LSURWM), .Atomic(LSUAtomicM),
.FlushCache(FlushDCacheM), .NextAdr(LSUAdrE), .PAdr(LSUPAdrM),
.ByteMask(ByteMaskM), .WordCount,
.FinalWriteData(LSUWriteDataM), .Cacheable(CacheableM),
.CacheStall(DCacheStallM), .CacheMiss(DCacheMiss), .CacheAccess(DCacheAccess),
.IgnoreRequestTLB, .TrapM, .CacheCommitted(DCacheCommittedM),
.CacheBusAdr(DCacheBusAdr), .ReadDataWord(ReadDataWordM),
.FetchBuffer, .CacheFetchLine(DCacheFetchLine),
.CacheWriteLine(DCacheWriteLine), .CacheBusAck(DCacheBusAck), .InvalidateCache(1'b0));
end else begin : passthrough flopen #(`XLEN) fb(.clk, .en(BufferCaptureEn), .d(HRDATA), .q(ReadDataWordMuxM));
assign LSUHWDATA = LSUWriteDataM[`XLEN-1:0];
busfsm #(0, LOGBWPL, `DCACHE) busfsm(
.clk, .reset, .IgnoreRequest, .RW(LSURWM), .CacheFetchLine(DCacheFetchLine), .CacheWriteLine(DCacheWriteLine),
.BusAck(LSUBusAck), .BusInit(LSUBusInit), .CPUBusy, .Cacheable(1'b0), .BusStall, .BusWrite(LSUBusWrite),
.SelBusWord, .BusRead(LSUBusRead), .BufferCaptureEn,
.HBURST(LSUHBURST), .HTRANS(LSUHTRANS), .BusTransComplete(LSUTransComplete),
.CacheBusAck(DCacheBusAck), .BusCommitted(BusCommittedM), .SelUncachedAdr, .WordCount(), .WordCountDelayed());
/* busdp #(WORDSPERLINE, LINELEN, LOGBWPL, `DCACHE) busdp(
.clk, .reset,
.HRDATA, .BusAck(LSUBusAck), .BusInit(LSUBusInit), .BusWrite(LSUBusWrite),
.BusRead(LSUBusRead), .HSIZE(LSUHSIZE), .HBURST(LSUHBURST), .HTRANS(LSUHTRANS), .BusTransComplete(LSUTransComplete),
.WordCount, .SelBusWord,
.Funct3(LSUFunct3M), .HADDR(LSUHADDR), .CacheBusAdr(DCacheBusAdr), .CacheFetchLine(DCacheFetchLine),
.CacheWriteLine(DCacheWriteLine), .CacheBusAck(DCacheBusAck), .FetchBuffer, .PAdr(LSUPAdrM),
.SelUncachedAdr, .IgnoreRequest, .RW(LSURWM), .CPUBusy, .Cacheable(CacheableM),
.BusStall, .BusCommitted(BusCommittedM)); */
// *** possible bug - ReadDatWordM vs. ReadDataWordMuxW - is byte swapping needed for endian
assign {ReadDataWordM, DCacheStallM, DCacheCommittedM, DCacheFetchLine, DCacheWriteLine} = '0; assign {ReadDataWordM, DCacheStallM, DCacheCommittedM, DCacheFetchLine, DCacheWriteLine} = '0;
assign DCacheMiss = CacheableM; assign DCacheAccess = CacheableM; assign DCacheMiss = CacheableM; assign DCacheAccess = CacheableM;
end end