Change default DANA config to 2PE, 512KiB Cache

This updates the default DANA configuration to use parameters that are
both suitable for small MNIST networks and that will barely fit on a
Zedboard.

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

src/main/scala/dana/Configs.scala

@@ -16,11 +16,11 @@ class DefaultHardwareConfig extends Config ( topDefinitions = {
     // Field widths
     case NnidWidth                 => 16
     // Processing Element Table
-    case PeTableNumEntries         => 1
+    case PeTableNumEntries         => 2
     case PeCooldownWidth           => 8
     // Configuration Cache
     case CacheNumEntries           => 2
-    case CacheSizeBytes            => 32 * 1024 // KiB
+    case CacheSizeBytes            => 512 * 1024 // KiB
     case CacheNumBlocks            => divUp(divUp((site(CacheSizeBytes) * 8),
       site(DanaDataBits)), site(ElementsPerBlock))
     case CacheInit                 => Nil