AR# 57854
|2014.1 Vivado Synthesis - Some patterns of asymmetric BRAM inference are not successful.
描述
Starting from 2014.1 Asymmetric BRAM inference has been supported.However, it has been found that some patterns of asymmetric BRAM inference are not successful.
Failure can occur in one of the following ways.
1. An Error is displayed by Vivado Synthesis.
ERROR: [Synth 8-2913] Unsupported Dual Port Block-RAM template for ram_reg.
Or
ERROR: [Synth 8-2914] Unsupported RAM template for RAM ram_reg.
2. RAM is implemented in registers.
The following warning is displayed in Synthesis.
Warning: Trying to implement RAM "ram_reg" in registers. Block RAM or DRAM implementation is not possible for one or more of the following reasons : 1: RAM has multiple writes via different ports in same process. If RAM inferencing intended, write to one port per process. 2: Unable to determine number of words or word size in RAM. RAM "ram_reg" dissolved into registers
3. RAM is not implemented as expected.
For example, if more BRAMs are inferred than expected.
解决方案
Not all patterns of Asymmetric BRAM coding are currently supported.
The asymmetric RAMs have to match the coding style guides in UG901.
The asymmetric BRAM coding examples are added in UG901 v2014.1.
The asymmetric RAMs have to match the coding style guides in UG901.
The asymmetric BRAM coding examples are added in UG901 v2014.1.
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| Answer Number | 问答标题 | 问题版本 | 已解决问题的版本 |
|---|---|---|---|
| 52264 | Does Vivado Synthesis support Asymmetric read/write port width block RAM inference? | N/A | N/A |