Performance

The following table lists DDR3, DDR4, and LPDDR3 speeds.

Table 1. DDR Performance
Memory Type I/O Type Speed (-1) Speed (STD)
DDR3 HSIO 1333 1067
GPIO 1067 800
DDR4 HSIO 1600 1333
LPDDR3 HSIO 1333 800
Note: For DDR timing closure, use the SmartTime reports from Libero SoC.

The following table lists DDR3, DDR4, and LPDDR3 throughput.

Table 2. Throughput
Memory Fabric Interface Frequency (MHz) Fabric Interface
 Data Width DDR
 Memory Data Width Theoretical Throughput Actual Throughput Actual Throughput (%)
Max Throughput (MB/s) Write (MB/s) Read (MB/s) Write (%) Read (%)
DDR3 166.66 256 32 5344 4945.19 4987.06 92.5% 93.3%
DDR3 (AXI4) 166.66 256 32 5344 5338.89 4866.08 99.9% 91.2%
DDR4 (NI1) 200 256 32 6400 5916.5 5866.9 92.4% 91.6%
DDR4 (AXI4) 200 256 32 6400 6395.9 5558.12 99.9% 86.84%
LPDDR3 (NI1) 166.66 256 32 5344 5034.4 4917.6 94.2% 92%
LPDDR3 (AXI4) 166.66 256 32 5344 5340.59 4681.22 99.9% 87.5%
Notes:
  1. 1.NI refers to native interface.
  2. 2.To get high DDR4 throughput, set tCCD_L to 4 on the Memory Timing tab of the PF_DDR4 Configurator.