replace ioDCache with ioMem

rocket/src/main/scala/arbiter.scala

@@ -20,12 +20,11 @@ class ioMem() extends Bundle
 
 class ioMemArbiter(n: Int) extends Bundle() {
   val mem = new ioMem();
-  val requestor = Vec(n) { new ioDCache() }
+  val requestor = Vec(n) { new ioMem().flip() }
 }
 
 class rocketMemArbiter(n: Int) extends Component {
   val io = new ioMemArbiter(n);
-  require(io.mem.req_tag.getWidth >= log2up(n) + io.requestor(0).req_tag.getWidth)
 
   var req_val = Bool(false)
   var req_rdy = io.mem.req_rdy

rocket/src/main/scala/coherence.scala

@@ -216,7 +216,7 @@ class CoherenceHubNoDir extends CoherenceHub {
 
   val io = new Bundle {
     val tiles = Vec(NTILES) { new ioTileLink() }
-    val mem = new ioDCache().flip
+    val mem = new ioMem
   }
   
   val trackerList = (0 until NGLOBAL_XACTS).map(new XactTracker(_))

rocket/src/main/scala/consts.scala

@@ -183,8 +183,8 @@ object Constants
   val COHERENCE_DATA_BITS = (1 << OFFSET_BITS)*8 
   val TILE_ID_BITS = 1
   val TILE_XACT_ID_BITS = 1 // log2(NMSHR)
-  val GLOBAL_XACT_ID_BITS = IDX_BITS // if one active xact per set
-  val NGLOBAL_XACTS = 1 << IDX_BITS
+  val GLOBAL_XACT_ID_BITS = 4
+  val NGLOBAL_XACTS = 1 << GLOBAL_XACT_ID_BITS
 
   val TTYPE_BITS = 2
   val X_READ_SHARED    = UFix(0, TTYPE_BITS)
@@ -198,11 +198,10 @@ object Constants
   val P_COPY       = UFix(2, PTYPE_BITS)
 
   // external memory interface
-  val IMEM_TAG_BITS = 1;
-  val DMEM_TAG_BITS = ceil(log(NMSHR)/log(2)).toInt;
-  val MEM_TAG_BITS = 2 + max(IMEM_TAG_BITS, DMEM_TAG_BITS);
-  val MEM_DATA_BITS = 128;
-  val REFILL_CYCLES = (1 << OFFSET_BITS)*8/MEM_DATA_BITS;
+  val MEM_TAG_BITS = 4
+  val MEM_DATA_BITS = 128
+  val REFILL_CYCLES = (1 << OFFSET_BITS)*8/MEM_DATA_BITS
+  require(MEM_TAG_BITS >= max(log2up(NMSHR)+1, GLOBAL_XACT_ID_BITS))
   
   val DTLB_ENTRIES = 8;
   val ITLB_ENTRIES = 8;

rocket/src/main/scala/htif.scala

@@ -26,7 +26,7 @@ class rocketHTIF(w: Int, ncores: Int) extends Component
   val io = new Bundle {
     val host = new ioHost(w)
     val cpu = Vec(ncores) { new ioHTIF().flip() }
-    val mem = new ioDCache().flip()
+    val mem = new ioMem
   }
 
   val short_request_bits = 64

rocket/src/main/scala/icache.scala

@@ -20,7 +20,7 @@ class ioImem(view: List[String] = null) extends Bundle (view)
 class ioRocketICache extends Bundle()
 {
   val cpu = new ioImem();
-  val mem = new ioDCache().flip()
+  val mem = new ioMem
 }
 
 // basic direct mapped instruction cache

rocket/src/main/scala/icache_prefetch.scala

@@ -6,8 +6,8 @@ import Constants._;
 import scala.math._;
 
 class ioIPrefetcher extends Bundle() {
-  val icache = new ioDCache();
-  val mem = new ioDCache().flip()
+  val icache = new ioMem().flip
+  val mem = new ioMem
   val invalidate = Bool(INPUT)
 }
 

rocket/src/main/scala/nbdcache.scala

@@ -136,7 +136,7 @@ class DataArrayArrayReq extends Bundle {
 class MemReq extends Bundle {
   val rw   = Bool()
   val addr = UFix(width = PADDR_BITS-OFFSET_BITS)
-  val tag  = Bits(width = DMEM_TAG_BITS)
+  val tag  = Bits(width = MEM_TAG_BITS)
 }
 
 class WritebackReq extends Bundle {
@@ -281,7 +281,7 @@ class MSHRFile extends Component {
     val req_way_oh = Bits(NWAYS, INPUT)
 
     val mem_resp_val = Bool(INPUT)
-    val mem_resp_tag = Bits(DMEM_TAG_BITS, INPUT)
+    val mem_resp_tag = Bits(MEM_TAG_BITS, INPUT)
     val mem_resp_idx = Bits(IDX_BITS, OUTPUT)
     val mem_resp_way_oh = Bits(NWAYS, OUTPUT)
 
@@ -671,19 +671,6 @@ class ioDmem(view: List[String] = null) extends Bundle(view) {
   val resp_tag  = Bits(DCACHE_TAG_BITS, OUTPUT);
 }
  
-// interface between D$ and next level in memory hierarchy
-class ioDCache(view: List[String] = null) extends Bundle(view) {
-  val req_addr  = UFix(PADDR_BITS - OFFSET_BITS, INPUT);
-  val req_tag   = UFix(DMEM_TAG_BITS, INPUT);
-  val req_val   = Bool(INPUT);
-  val req_rdy   = Bool(OUTPUT);
-  val req_wdata = Bits(MEM_DATA_BITS, INPUT);
-  val req_rw    = Bool(INPUT);
-  val resp_data = Bits(MEM_DATA_BITS, OUTPUT);
-  val resp_tag  = Bits(DMEM_TAG_BITS, OUTPUT);
-  val resp_val  = Bool(OUTPUT);
-}
- 
 abstract class HellaCache extends Component {
   def isHit ( cmd: Bits, state: UFix): Bool
   def isValid (state: UFix): Bool
@@ -698,7 +685,7 @@ abstract class HellaCache extends Component {
 class HellaCacheUniproc extends HellaCache with ThreeStateIncoherence {
   val io = new Bundle {
     val cpu = new ioDmem()
-    val mem = new ioDCache().flip
+    val mem = new ioMem
   }
  
   val lines       = 1 << IDX_BITS