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48.2. Resource Usage and Performance
This section lists the resource usage and performance data for supported devices when operating the Half-Rate Bridge with a full-rate DDR SDRAM high-performance memory controller.
Using the Half-Rate Bridge with a full-rate DDR SDRAM high-performance memory controller results an average of 48% performance improvement over a system using a half-rate DDR SDRAM high-performance memory controller in a series of embedded applications. The performance improvement is 62.2% based on the Dhrystone benchmark, and 87.7% when accessing memory bypassing the cache. For memory systems that use the Half-Rate bridge in conjunction with DDR2/3 High Performance Controller, the data throughput is the same on the Half-Rate Bridge host and agent interfaces. The decrease in memory latency on the Half-Rate Bridge agent interface results in higher performance for the processor.
The table below shows the resource usage for Stratix® II and Stratix® III devices in the Quartus® Prime software with a data width of 16 bits, an address span of 24 bits.
Device Family | Combinational ALUTs | ALMs | Logic Register | Embedded Memory |
---|---|---|---|---|
Stratix® II | 61 | 134 | 153 | 0 |
Stratix® III | 60 | 138 | 153 | 0 |
Logic Cells (LC) | Logic Register | LUT-only LC | Register-only LC | LUT/Register LCs | Embedded Memory |
---|---|---|---|---|---|
233 | 152 | 33 | 84 | 121 | 0 |