diff --git a/rocket/src/main/scala/dcache.scala b/rocket/src/main/scala/dcache.scala index d9872515..7e55b10a 100644 --- a/rocket/src/main/scala/dcache.scala +++ b/rocket/src/main/scala/dcache.scala @@ -251,16 +251,18 @@ class rocketDCacheDM(lines: Int) extends Component { // val tag_array = new rocketSRAMsp(lines, tagbits); val tag_array = new TS1N65LPA128X27M4; - tag_array.io.a := tag_addr; - tag_array.io.d := r_cpu_req_ppn; - tag_array.io.web := ~tag_we; - tag_array.io.bweb := Bits(0,tagbits); - tag_array.io.ceb := !( - (io.cpu.req_val && io.cpu.req_rdy) || + val tag_array_ceb = Mux(reset, Bool(true), !( + (io.cpu.req_val && io.cpu.req_rdy) || (state === s_start_writeback) || - (state === s_writeback)); - val tag_rdata = tag_array.io.q; - tag_array.io.tsel := Bits(1,2); + (state === s_writeback))); + val tag_array_web = Mux(reset, Bool(true), !tag_we); + tag_array.io.A := tag_addr; + tag_array.io.D := r_cpu_req_ppn; + tag_array.io.CEB := tag_array_ceb && tag_array_web; + tag_array.io.WEB := tag_array_web; + tag_array.io.BWEB := Bits(0,tagbits); + val tag_rdata = tag_array.io.Q; + tag_array.io.TSEL := Bits(1,2); // valid bit array val vb_array = Reg(resetVal = Bits(0, lines)); @@ -335,7 +337,7 @@ class rocketDCacheDM(lines: Int) extends Component { // data array // val data_array = new rocketSRAMsp(lines*4, 128); val data_array = new TS1N65LPA512X128M4; - val data_array_rdata = data_array.io.q; + val data_array_rdata = data_array.io.Q; val resp_data = Mux(r_cpu_req_idx(offsetlsb).toBool, data_array_rdata(127, 64), data_array_rdata(63,0)); val r_resp_data = Reg(resp_data); @@ -363,36 +365,40 @@ class rocketDCacheDM(lines: Int) extends Component { amo_alu.io.rhs := r_amo_data.toUFix; val amo_alu_out = Cat(amo_alu.io.result,amo_alu.io.result); - data_array.io.a := + data_array.io.A := Mux(drain_store || resolve_store, p_store_idx(PGIDX_BITS-1, offsetmsb-1), Mux((state === s_writeback) && io.mem.req_rdy, Cat(r_cpu_req_idx(PGIDX_BITS-1, offsetbits), rr_count_next), Mux((state === s_start_writeback) || (state === s_writeback) || (state === s_refill), Cat(r_cpu_req_idx(PGIDX_BITS-1, offsetbits), rr_count), Mux((state === s_resolve_miss) || (state === s_replay_load) || (state === s_write_amo), r_cpu_req_idx(PGIDX_BITS-1, offsetmsb-1), io.cpu.req_idx(PGIDX_BITS-1, offsetmsb-1))))).toUFix; - data_array.io.d := + data_array.io.D := Mux((state === s_refill), io.mem.resp_data, Mux((state === s_write_amo), amo_alu_out, store_data)); - - data_array.io.web := !( + + val data_array_web = Mux(reset, Bool(true), !( ((state === s_refill) && io.mem.resp_val) || (state === s_write_amo) || - drain_store || resolve_store); + drain_store || resolve_store)); + + data_array.io.WEB := data_array_web; - data_array.io.bweb := ~( + data_array.io.BWEB := ~( Mux((state === s_refill), ~Bits(0,128), Mux((state === s_write_amo), amo_store_wmask, store_wmask))); - data_array.io.ceb := !( + val data_array_ceb = Mux(reset, Bool(true), !( (io.cpu.req_val && io.cpu.req_rdy && (req_load || req_amo)) || (state === s_start_writeback) || (state === s_writeback) || ((state === s_resolve_miss) && (r_req_load || r_req_amo)) || - (state === s_replay_load)); + (state === s_replay_load))); - data_array.io.tsel := Bits(1,2); + data_array.io.CEB := data_array_ceb && data_array_web; + + data_array.io.TSEL := Bits(1,2); // signal a load miss when the data isn't present in the cache and when it's in the pending store data register // (causes the cache to block for 2 cycles and the load or amo instruction is replayed) val load_miss = diff --git a/rocket/src/main/scala/icache.scala b/rocket/src/main/scala/icache.scala index 2d332657..e7a53ee3 100644 --- a/rocket/src/main/scala/icache.scala +++ b/rocket/src/main/scala/icache.scala @@ -36,13 +36,13 @@ class ioICacheDM extends Bundle() // single port SRAM i/o class ioSRAMsp (width: Int, addrbits: Int) extends Bundle { - val a = UFix(addrbits, 'input); // address - val d = Bits(width, 'input); // data input - val bweb = Bits(width, 'input); // bit write enable mask - val ceb = Bool('input); // chip enable - val web = Bool('input); // write enable - val q = Bits(width, 'output); // data out - val tsel = Bits(2, 'input); + val A = UFix(addrbits, 'input); // address + val D = Bits(width, 'input); // data input + val BWEB = Bits(width, 'input); // bit write enable mask + val CEB = Bool('input); // chip enable + val WEB = Bool('input); // write enable + val Q = Bits(width, 'output); // data out + val TSEL = Bits(2, 'input); } // single ported SRAM @@ -51,9 +51,10 @@ class TS1N65LPA128X27M4 extends Component { val width = 27; val entries = 128; val io = new ioSRAMsp(width, addrbits); - val sram = Mem(entries, ~io.web, io.a, io.d, wrMask = ~io.bweb, resetVal = null); - val rdata = Reg(Mux(~io.ceb, sram.read(io.a), Bits(0,width))); - io.q := rdata; + val wmask = ~io.BWEB; + val sram = Mem(entries, !io.WEB, io.A, io.D, wrMask = wmask, resetVal = null); + val rdata = Reg(Mux(!io.CEB, sram.read(io.A), Bits(0,width))); + io.Q := rdata; } class TS1N65LPA512X128M4 extends Component { @@ -61,9 +62,10 @@ class TS1N65LPA512X128M4 extends Component { val width = 128; val entries = 512; val io = new ioSRAMsp(width, addrbits); - val sram = Mem(entries, ~io.web, io.a, io.d, wrMask = ~io.bweb, resetVal = null); - val rdata = Reg(Mux(~io.ceb, sram.read(io.a), Bits(0,width))); - io.q := rdata; + val wmask = ~io.BWEB; + val sram = Mem(entries, !io.WEB, io.A, io.D, wrMask = wmask, resetVal = null); + val rdata = Reg(Mux(!io.CEB, sram.read(io.A), Bits(0,width))); + io.Q := rdata; } /* class rocketSRAMsp(entries: Int, width: Int) extends Component { @@ -127,13 +129,15 @@ class rocketICacheDM(lines: Int) extends Component { Mux((state === s_refill_wait), r_cpu_req_idx(PGIDX_BITS-1,offsetbits), io.cpu.req_idx(PGIDX_BITS-1,offsetbits)).toUFix; val tag_we = (state === s_refill_wait) && io.mem.resp_val; - tag_array.io.a := tag_addr; - tag_array.io.d := r_cpu_req_ppn; - tag_array.io.web := ~tag_we; - tag_array.io.tsel := Bits(1,2); - tag_array.io.bweb := Bits(0,tagbits); - tag_array.io.ceb := !(io.cpu.req_val && io.cpu.req_rdy); - val tag_rdata = tag_array.io.q; + val tag_array_ceb = Mux(reset, Bool(true), !(io.cpu.req_val && io.cpu.req_rdy)); + val tag_array_web = Mux(reset, Bool(true), !tag_we); + tag_array.io.A := tag_addr; + tag_array.io.D := r_cpu_req_ppn; + tag_array.io.CEB := tag_array_ceb && tag_array_web; + tag_array.io.WEB := tag_array_web; + tag_array.io.TSEL := Bits(1,2); + tag_array.io.BWEB := Bits(0,tagbits); + val tag_rdata = tag_array.io.Q; // valid bit array val vb_array = Reg(resetVal = Bits(0, lines)); @@ -150,16 +154,18 @@ class rocketICacheDM(lines: Int) extends Component { // data array // val data_array = new rocketSRAMsp(lines*4, 128); val data_array = new TS1N65LPA512X128M4; - data_array.io.a := + val data_array_ceb = Mux(reset, Bool(true), !((io.cpu.req_rdy && io.cpu.req_val) || (state === s_resolve_miss))); + val data_array_web = Mux(reset, Bool(true), ~io.mem.resp_val); + data_array.io.A := Mux((state === s_refill_wait) || (state === s_refill), Cat(r_cpu_req_idx(PGIDX_BITS-1, offsetbits), refill_count), io.cpu.req_idx(PGIDX_BITS-1, offsetmsb-1)).toUFix; - data_array.io.d := io.mem.resp_data; - data_array.io.web := ~io.mem.resp_val; - data_array.io.bweb := Bits(0,128); - data_array.io.tsel := Bits(1,2); - data_array.io.ceb := !((io.cpu.req_rdy && io.cpu.req_val) || (state === s_resolve_miss)); + data_array.io.D := io.mem.resp_data; + data_array.io.CEB := data_array_ceb && data_array_web; + data_array.io.WEB := data_array_web; + data_array.io.BWEB := Bits(0,128); + data_array.io.TSEL := Bits(1,2); - val data_array_rdata = data_array.io.q; + val data_array_rdata = data_array.io.Q; // output signals io.cpu.resp_val := !io.cpu.itlb_miss && (state === s_ready) && r_cpu_req_val && tag_valid && tag_match;