Changes between Version 40 and Version 41 of InterconnexionNetworks

Timestamp:

Mar 18, 2013, 3:51:43 PM (12 years ago)

Author:

alain

Comment:

--

InterconnexionNetworks

@@ -62 +62 @@
 === 3.1  VCI encoding of the various transaction types on the direct network ===
 
-There are 5 transaction types ('''READ''', '''WRITE''', '''LL''', '''SC''', '''CAS''') on the direct network, and four sub-types for '''READ''' transactions. These types are encoded through the pair of VCI fields '''CMD''' and '''PKTID'''. When a given initiator can send several simultaneous transactions of a given type (such as several simultaneous '''WRITE''' transactions), the VCI '''TRDID''' field is used to discriminate them.
-
-Possible values for the VCI '''CMD''' field are :
-
-|| encoding (2 bits) || value                    ||
-||                   ||                          ||
-|| 00                || CMD_NOP / CMD_STORE_COND ||
-|| 01                || CMD_READ                 ||
-|| 10                || CMD_WRITE                ||
-|| 11                || CMD_LOCKED_READ          ||
-
-The '''PKTID''' field in TSAR is 4 bits long. Only 8 types of transaction are used : the MSB is ignored (reserved for future use). A specific VCI '''CMD''' value must be used for each '''PKTID''' value, as described in the table below :
-
-|| encoding (4 bits) || '''PKTID''' value   || '''CMD''' value ||
-||                   ||                     ||                 ||
-|| X000              || TYPE_READ_DATA_UNC  || CMD_READ        ||
-|| X001              || TYPE_READ_DATA_MISS || CMD_READ        ||
-|| X010              || TYPE_READ_INS_UNC   || CMD_READ        ||
-|| X011              || TYPE_READ_INS_MISS  || CMD_READ        ||
-|| X100              || TYPE_WRITE          || CMD_WRITE       ||
-|| X101              || TYPE_CAS            || CMD_NOP         ||
-|| X110              || TYPE_LL             || CMD_LOCKED_READ ||
-|| X111              || TYPE_SC             || CMD_STORE_COND  ||
+There are 8 transaction types ('''READ_DATA_UNC''', '''READ_DATA_MISS''', '''READ_INS_UNC''', '''READ_INS_MISS''', '''WRITE''', '''CAS''', '''LL''', '''SC''') on the direct network. These types are encoded through the pair of VCI fields '''CMD''' and '''PKTID'''. The '''PKTID''' field in TSAR is 4 bits long, but the MSB is ignored (reserved for future use). 
+
+||TYPE          ||CMD (2 bits)||PKTID (4 bits)|| '''PKTID''' mnemo   || '''CMD''' mnemo ||
+||              ||            ||              ||                     ||                 ||
+||READ_DATA_UNC ||01          ||X000          || TYPE_READ_DATA_UNC  || CMD_READ        ||
+||READ_DATA_MISS||01          ||X001          || TYPE_READ_DATA_MISS || CMD_READ        ||
+||READ_INS_UNC  ||01          ||X010          || TYPE_READ_INS_UNC   || CMD_READ        ||
+||READ_INS_MISS ||01          ||X011          || TYPE_READ_INS_MISS  || CMD_READ        ||
+||WRITE         ||10          ||X100          || TYPE_WRITE          || CMD_WRITE       ||
+||CAS           ||00          ||X101          || TYPE_CAS            || CMD_STORE_COND  ||
+||LL            ||11          ||X110          || TYPE_LL             || CMD_LOCKED_READ ||
+||SC            ||00          ||X111          || TYPE_SC             || CMD_STORE_COND  ||
 
 Remarks on the '''PKTID''' field encoding :
@@ -90 +79 @@
  * for a TYPE_READ, bit 1 is set (resp. not set) for an instruction (resp. data) request
  * bit 2 can be used to check for a TYPE_READ (bit 2 = 0)
+
+When a given initiator can send several simultaneous transactions of a given type (such as several simultaneous '''WRITE''' transactions), the VCI '''TRDID''' field is used to discriminate them.
 
 ==== 3.1.1 VCI READ transaction ====