From c202449e34ff593ac653b3a2368e8c9a457bfcca Mon Sep 17 00:00:00 2001
From: Henry Cook <hcook@eecs.berkeley.edu>
Date: Thu, 14 May 2015 15:29:49 -0700
Subject: [PATCH] first version NASTI IOs

---
 uncore/src/main/scala/nasti.scala | 89 +++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 uncore/src/main/scala/nasti.scala

diff --git a/uncore/src/main/scala/nasti.scala b/uncore/src/main/scala/nasti.scala
new file mode 100644
index 00000000..d0ce1657
--- /dev/null
+++ b/uncore/src/main/scala/nasti.scala
@@ -0,0 +1,89 @@
+// See LICENSE for license details.
+
+package uncore
+import Chisel._
+
+case object NASTIDataBits extends Field[Int]
+case object NASTIAddrBits extends Field[Int]
+case object NASTIReadIdBits extends Field[Int]
+case object NASTIWriteIdBits extends Field[Int]
+
+trait NASTIParameters extends UsesParameters {
+  val dataBits = params(NASTIDataBits)
+  val strobeBits = dataBits / 8
+  val addrBits = params(NASTIAddrBits)
+  val widBits = params(NASTIWriteIdBits)
+  val ridBits = params(NASTIReadIdBits)
+  val userBits = 32
+  val awUserBits = userBits
+  val wUserBits = userBits
+  val bUserBits = userBits
+  val arUserBits = userBits
+  val rUserBits = userBits
+}
+
+abstract class NASTIBundle extends Bundle with NASTIParameters
+abstract class NASTIModule extends Module with NASTIParameters
+
+trait NASTIChannel extends NASTIBundle
+trait NASTIMasterToSlaveChannel extends NASTIChannel
+trait NASTISlaveToMasterChannel extends NASTIChannel
+
+class NASTIMasterIO extends Bundle {
+  val writeAddress  = Decoupled(new NASTIaw)
+  val writeData     = Decoupled(new NASTIw)
+  val writeResponse = Decoupled(new NASTIb).flip
+  val readAddress   = Decoupled(new NASTIar)
+  val readData      = Decoupled(new NASTIr).flip
+}
+
+class NASTISlaveIO extends NASTIMasterIO { flip() }
+
+class NASTIaw extends NASTIMasterToSlaveChannel {
+  val awID      = UInt(width = widBits)
+  val awAddr    = UInt(width = addrBits)
+  val awLen     = UInt(width = 8)
+  val awSize    = UInt(width = 3)
+  val awBurst   = UInt(width = 2)
+  val awCache   = UInt(width = 4)
+  val awProt    = UInt(width = 3)
+  val awQOS     = UInt(width = 4)
+  val awRegion  = UInt(width = 4)
+  val awLock    = Bool()
+  val awUser    = UInt(width = awUserBits)
+}
+
+class NASTIw extends NASTIMasterToSlaveChannel {
+  val wData   = UInt(width = dataBits)
+  val wStrb   = UInt(width = strobeBits)
+  val wUser   = UInt(width = wUserBits)
+  val wLast   = Bool()
+}
+
+class NASTIb extends NASTISlaveToMasterChannel {
+  val bID     = UInt(width = widBits)
+  val bResp   = UInt(width = 2)
+  val bUser   = UInt(width = bUserBits)
+}
+
+class NASTIar extends NASTIMasterToSlaveChannel {
+  val arID      = UInt(width = ridBits)
+  val arAddr    = UInt(width = addrBits)
+  val arLen     = UInt(width = 8)
+  val arSize    = UInt(width = 3)
+  val arBurst   = UInt(width = 2)
+  val arCache   = UInt(width = 4)
+  val arQOS     = UInt(width = 3)
+  val arRegion  = UInt(width = 4)
+  val arProt    = UInt(width = 4)
+  val arLock    = Bool()
+  val arUser    = UInt(width = arUserBits)
+}
+
+class NASTIr extends NASTISlaveToMasterChannel {
+  val rID     = UInt(width = ridBits)
+  val rData   = UInt(width = dataBits)
+  val rResp   = UInt(width = 2)
+  val rUser   = UInt(width = rUserBits)
+  val rLast   = Bool()
+}