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Ixiasoft
Visible to Intel only — GUID: sss1424759894147
Ixiasoft
2.3.1.4. SMH Lookup
The .smh file represents a hash of the CRAM bit settings on a design. Related groups of CRAM are mapped to a signal bit in the sensitivity array. During an SEU event, the application can perform a lookup against the .smh to determine if a bit is used. By using the information about the location of a bit, you can reduce the effective soft error rate in a running system.
The following criteria determine the criticality of a CRAM location in your design:
- Routing—All bits that control a utilized routing line.
- Adaptive logic modules (ALMs)—If you configure an ALM, the IP core considers all CRAM bits related to that ALM sensitive.
- Logic array block (LAB) control lines—If you use an ALM in a LAB, the IP core considers all bits related to the control signals feeding that LAB sensitive.
- M20K memory blocks and digital signal processing (DSP) blocks—If you use a block, the IP core considers all CRAM bits related to that block sensitive.
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