Changes between Version 61 and Version 62 of InterconnexionNetworks

Timestamp:

Apr 15, 2013, 7:27:10 PM (12 years ago)

Author:

alain

Comment:

--

InterconnexionNetworks

@@ -19 +19 @@
 On the direct network, each VCI port has an identifier that is defined by three indexes :
 
- * '''X_ID''' is the cluster X-coordinate.
- * '''Y_ID''' is the cluster Y-coordinate. 
+ * '''X_ID''' is the cluster X-coordinate in the 2D mesh.
+ * '''Y_ID''' is the cluster Y-coordinate in the 2D mexh. 
  * '''L_ID''' is the local index inside the cluster. 
 
@@ -43 +43 @@
 
 The initiator identification is required to route a response packet.
-a VCI initiator is identified by the VCI SRCID & RSRCID fields (NX + NY + NL bits) :
+a VCI initiator is identified by the VCI SRCID field : (NX + NY + NL) bits.
 
 || X_ID    || Y_ID    || L_ID    || 
 || NX bits || NY bits || NL bits || 
 
-Therefore, the total SRCID width cannot be larger than 14 bits. It can use less than 14 bits when the number of clusters is smaller than 1024. 
+ * The max value of the SRCID_SIZE is 14 bits.
+ * NX can have any value from 0 to 5 (from 1 to 32 clusters per row).
+ * NY can have any value from 0 to 5 (from 1 to 32 clusters per column).
+ * NL is always equal to SRCID_SIZE - (NX + NY), but only the 4 LSB bits are significant.
+
+As we want to support configuration up to 1024 clusters, the X_ID and YID fields can require up to
+10 bits. Therefore, the local index L_ID cannot use more than 4 bits, even if NL is larger than 4. 
 
 == 3.  VCI encoding of the transaction on the direct network ==