riscv/rocket-chip
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renamed SRAM modules to match TSMC65 MC generated SRAMs

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This commit is contained in:
Rimas Avizienis
2011-12-01 13:14:33 -08:00
parent da2fdf4f85
commit cf1965493b
2 changed files with 53 additions and 23 deletions
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28
rocket/src/main/scala/dcache.scala
View File

@@ -249,16 +249,18 @@ class rocketDCacheDM(lines: Int) extends Component {
((state === s_refill) && io.mem.resp_val && (rr_count === UFix(3,2))) ||
((state === s_resolve_miss) && r_req_flush);
val tag_array = new rocketSRAMsp(lines, tagbits);
// 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.we := tag_we;
tag_array.io.bweb := ~Bits(0,tagbits);
tag_array.io.ce :=
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) ||
(state === s_start_writeback) ||
(state === s_writeback);
(state === s_writeback));
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));
@@ -331,7 +333,8 @@ class rocketDCacheDM(lines: Int) extends Component {
val store_wmask = Mux(p_store_idx(offsetlsb).toBool, Cat(store_wmask_d, Bits(0,64)), Cat(Bits(0,64), store_wmask_d));
// data array
val data_array = new rocketSRAMsp(lines*4, 128);
// val data_array = new rocketSRAMsp(lines*4, 128);
val data_array = new TS1N65LPA512X128M4;
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);
@@ -372,23 +375,24 @@ class rocketDCacheDM(lines: Int) extends Component {
Mux((state === s_write_amo), amo_alu_out,
store_data));
data_array.io.we :=
data_array.io.web := !(
((state === s_refill) && io.mem.resp_val) ||
(state === s_write_amo) ||
drain_store || resolve_store;
drain_store || resolve_store);
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));
store_wmask)));
data_array.io.ce :=
data_array.io.ceb := !(
(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);
// 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 =

46
rocket/src/main/scala/icache.scala
View File

@@ -39,12 +39,33 @@ 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 ce = Bool('input); // chip enable
val we = Bool('input); // write enable
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
class TS1N65LPA128X27M4 extends Component {
val addrbits = 7;
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;
}
class TS1N65LPA512X128M4 extends Component {
val addrbits = 9;
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;
}
/*
class rocketSRAMsp(entries: Int, width: Int) extends Component {
val addrbits = ceil(log10(entries)/log10(2)).toInt;
val io = new ioSRAMsp(width, addrbits);
@@ -52,6 +73,7 @@ class rocketSRAMsp(entries: Int, width: Int) extends Component {
val rdata = Reg(Mux(io.ce, sram.read(io.a), Bits(0,width)));
io.q := rdata;
}
*/
// basic direct mapped instruction cache
// 32 bit wide cpu port, 128 bit wide memory port, 64 byte cachelines
@@ -99,16 +121,18 @@ class rocketICacheDM(lines: Int) extends Component {
}
// tag array
val tag_array = new rocketSRAMsp(lines, tagbits);
// val tag_array = new rocketSRAMsp(lines, tagbits);
val tag_array = new TS1N65LPA128X27M4;
val tag_addr =
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.we := tag_we;
tag_array.io.bweb := ~Bits(0,tagbits);
tag_array.io.ce := (io.cpu.req_val && io.cpu.req_rdy);
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;
// valid bit array
@@ -124,14 +148,16 @@ class rocketICacheDM(lines: Int) extends Component {
val tag_match = (tag_rdata === io.cpu.req_ppn);
// data array
val data_array = new rocketSRAMsp(lines*4, 128);
// val data_array = new rocketSRAMsp(lines*4, 128);
val data_array = new TS1N65LPA512X128M4;
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.we := io.mem.resp_val;
data_array.io.bweb := ~Bits(0,128);
data_array.io.ce := (io.cpu.req_rdy && io.cpu.req_val) || (state === s_resolve_miss);
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));
val data_array_rdata = data_array.io.q;