Changes between Version 76 and Version 77 of InterconnexionNetworks

Timestamp:

Jun 6, 2013, 11:18:25 AM (12 years ago)

Author:

alain

Comment:

--

InterconnexionNetworks

@@ -127 +127 @@
 == 5.  DSPIN packet encoding on the direct network ==
 
-The VCI command & response packets are translated (actually serialized) to DSPIN network format by the VCI/RING wrappers (in platform using the RING local interconnect) or by the VCI/DSPIN wrappers (in platforms using a XBAR local interconnect). These wrappers are located between the VCI initiator and target components and the DSPIN network. The DSPIN command packet width is 40 bits, and the DSPIN response packet width is 33 bits. The DSPIN interconnexion network uses only the following information to route the DSPIN packets to the proper destination:
+The VCI command & response packets are translated (actually serialized) to DSPIN network format by the VCI/DSPIN wrappers. These wrappers are located between the VCI initiator and target components and the DSPIN network. The DSPIN command packet width is 40 bits (including EOP), and the DSPIN response packet width is 33 bits (including EOP). The DSPIN interconnexion network uses only the following information to route the DSPIN packets to the proper destination:
+
  * The EOP flag, defining the last flit of a DSPIN packet.
- * The LSB bit of the first flit is the BC flag,  defining a DSPIN broadcast packet. 
- * For a non broadcast packet (BC = 0), the (NX+NY+NL) MSB bits of the first field are used to route the packet to the proper destination.
- * For a broadcast packet (BC = 1), the XMIN, XMAX, YMIN, YMAX fields (5 bits each), are used by the network to limit the broadcast.
+ * The (NX+NY+NL) MSB bits of the first flit are used to route the packet to the proper destination.
+ * In a DSPIN command packet, the first flit LSB bit (BC) must be 0.
 
 The DSPIN format can transport up to 40 bits VCI ADDRESS, and up to 14 bits VCI SRCID.