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Backdoor access to memory with addressing scheme that does not expose all bits

UVM 5532
UVM MEMORY MODELING 5 memory verification 2 memory 5
cbienvenu
cbienvenu
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November 17, 2016 at 1:52 pm

I have a memory which has a 128x32 interface; 128 addresses with 32 bits of data.
The actual memory in use is 128x39. It is wider than the presented interface so ECC can be applied to the data.

I am attempting to verify correct operation of the ECC encoder, in-place.
Is it possible to use the UVM register layer to backdoor access or otherwise control all of the bit positions in the actual memory at a given address?

+------------------------------------------------------------+
|                                                            |
|  128x32 memory wrapper                                     |
|                                                            |
|                                       +-----------------+  |
|                                       |                 |  |
|  address                              |  128x39 memory  |  |
+---------------------------------------+                 |  |
|                                       |                 |  |
|                                       |                 |  |
|           +------------+              |                 |  |
|  data-in  |            | ecc-data-in  |                 |  |
+-----------+  ECC       +--------------+                 |  |
|           |  encoder/  |              |                 |  |
|           |  decoder   |              |                 |  |
|  data-out |            | ecc-data-out |                 |  |
+-----------+            +--------------+                 |  |
|           |            |              |                 |  |
|           +------------+              +-----------------+  |
|                                                            |
+------------------------------------------------------------+

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