riscv/rocket-chip
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icache/dcache tag+data arrays now implemented using Mem4()

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however there seems to be a bug - readLatency needs to be set to 0
for C model to work, and 1 for Verilog model.
This commit is contained in:
Rimas Avizienis 2011-12-04 01:18:38 -08:00
parent e894b79870
commit ff95cacb55
2 changed files with 1 additions and 10 deletions
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4
rocket/src/main/scala/dcache.scala
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@ -252,8 +252,6 @@ class rocketDCacheDM(lines: Int) extends Component {
val tag_array = Mem4(lines, r_cpu_req_ppn); val tag_array = Mem4(lines, r_cpu_req_ppn);
tag_array.setReadLatency(0); tag_array.setReadLatency(0);
val tag_rdata = tag_array.rw(tag_addr, r_cpu_req_ppn, tag_we); val tag_rdata = tag_array.rw(tag_addr, r_cpu_req_ppn, tag_we);
// tag_array.write(tag_addr, r_cpu_req_ppn, tag_we);
// val tag_rdata = tag_array(tag_addr);
// valid bit array // valid bit array
val vb_array = Reg(resetVal = Bits(0, lines)); val vb_array = Reg(resetVal = Bits(0, lines));
@ -370,8 +368,6 @@ class rocketDCacheDM(lines: Int) extends Component {
val data_array = Mem4(lines*4, data_wdata); val data_array = Mem4(lines*4, data_wdata);
data_array.setReadLatency(0); data_array.setReadLatency(0);
val data_array_rdata = data_array.rw(data_addr, data_wdata, data_we, data_wmask); val data_array_rdata = data_array.rw(data_addr, data_wdata, data_we, data_wmask);
// data_array.write(data_addr, data_wdata, data_we, data_wmask);
// val data_array_rdata = data_array(data_addr);
val resp_data = Mux(r_cpu_req_idx(offsetlsb).toBool, data_array_rdata(127, 64), data_array_rdata(63,0)); 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); val r_resp_data = Reg(resp_data);

5
rocket/src/main/scala/icache.scala
View File

@ -87,9 +87,6 @@ class rocketICacheDM(lines: Int) extends Component {
tag_array.setReadLatency(0); tag_array.setReadLatency(0);
val tag_rdata = tag_array.rw(tag_addr, r_cpu_req_ppn, tag_we); val tag_rdata = tag_array.rw(tag_addr, r_cpu_req_ppn, tag_we);
// tag_array.write(tag_addr, r_cpu_req_ppn, tag_we);
// val tag_rdata = tag_array.read(tag_addr);
// valid bit array // valid bit array
val vb_array = Reg(resetVal = Bits(0, lines)); val vb_array = Reg(resetVal = Bits(0, lines));
when (io.cpu.invalidate) { when (io.cpu.invalidate) {
@ -109,8 +106,6 @@ class rocketICacheDM(lines: Int) extends Component {
val data_array = Mem4(lines*4, io.mem.resp_data); val data_array = Mem4(lines*4, io.mem.resp_data);
data_array.setReadLatency(0); data_array.setReadLatency(0);
val data_array_rdata = data_array.rw(data_addr, io.mem.resp_data, io.mem.resp_val); val data_array_rdata = data_array.rw(data_addr, io.mem.resp_data, io.mem.resp_val);
// data_array.write(data_addr, io.mem.resp_data, io.mem.resp_val);
// val data_array_rdata = data_array.read(data_addr);
// output signals // output signals
io.cpu.resp_val := !io.cpu.itlb_miss && (state === s_ready) && r_cpu_req_val && tag_valid && tag_match; io.cpu.resp_val := !io.cpu.itlb_miss && (state === s_ready) && r_cpu_req_val && tag_valid && tag_match;