Changes between Version 20 and Version 21 of AtomicOperations

Timestamp:

Nov 8, 2017, 7:47:55 AM (7 years ago)

Author:

alain

Comment:

--

AtomicOperations

@@ -61 +61 @@
 
 We summarize below the actions done by the L2 cache controller receiving a LL(X), SC(X,D,K) or SW(X,D) VCI command from a L1 cache controller:
- * '''LL(X)''' : The L2 cache makes an associative search on the X address in the ''reservation table''. In case of hit (X = Xr), the L2 cache returns both the D value stored at address X, and the K value stored in the ''reservation table'' to the L1 cache. In case of miss, the L2 cache allocates a new K value from the key allocator,
-registers a new entry in the ''reservation table''(this can require a victim eviction), and returns the D and K values to the L1 cache.
+ * '''LL(X)''' : The L2 cache makes an associative search on the X address in the ''reservation table''. In case of hit (X = Xr), the L2 cache returns both the D value stored at address X, and the K value stored in the ''reservation table'' to the L1 cache. In case of miss, the L2 cache allocates a new K value from the key allocator, registers a new entry in the ''reservation table''(this can require a victim eviction), and returns the D and K values to the L1 cache.
  * '''SC(X,D,K)''' : The L2 cache makes an associative search on both the the X address and the K key in the ''reservation table''. In case of hit, the reservation is invalided in the ''reservation table'', the D value is written at address X, and a ''success'' value is returned to the L1 cache. In case of miss, the D value is not written at address X, the ''reservation table'' is not modified, and a ''failure'' value is returned to the L1 cache.
  * '''SW(X,D)''' : The L2 cache makes an associative search on the X address in the ''reservation table''. As the write command can be a burst, with a Xmin and Xmax addresses, the HIT condition for each entry containing an address Xr is actually Xmin <= Xr <= Xmax. In case of hit, the reservation Xr is invalidated. In case of miss, the ''reservation table'' is not modified. In both cases the D value is written at address X.