Memory Configurations; Performance; Table 125 Supported Memory (Ddr2, Ddr3, And Lpddr1) Configurations; Table 126 Ddr Speeds - Microchip Technology Microsemi SmartFusion2 User Manual

Fabric DDR Subsystem
The FDDR subsystem accepts data transfer requests from AXI or AHB interfaces. Any read or write
transactions to the DDR memories can occur through the AXI or AHBL masters in the FPGA fabric
through DDR_FIC interface.
Note: The maximum DDR3 data rate supported by FDDR is 333MHz/667Mbps. Therefore, Write Leveling is
not mandatory and the interface works if the board layout includes length matching and follows
SmartFusion2 and IGLOO2 Board Design Guidelines Application
auto-generates pre-defined static delay ratios for FDDR initialization. These delay values are sufficient if
the board layout follows the SmartFusion2/IGLOO2 board-level guidelines.
4.2

Memory Configurations

The SmartFusion2/IGLOO2 FDDR subsystem supports a wide range of common memory types,
configurations, and densities, as shown in the following table. If SECDED mode is enabled in the FDDR
controller, the external memory module must be connected to the following:
• Data lines FDDR_DQ_ECC[3:0] when data width is x32
• Data lines FDDR_DQ_ECC[1:0] when data width is x16
• Data line FDDR_DQ_ECC[0] when data width is x8
Table 125 • Supported Memory (DDR2, DDR3, and LPDDR1) Configurations
Memory Width (in SECDED
Depth Width Mode)
128M or x32 x36
Less
x16 x18
x8 x9
256M x32 x36
x16 x18
x8 x9
512M x32 x36
x16 x18
x8 x9
1G x32 x36
x16 x18
x8 x9
4.3

Performance

The following table shows the maximum data rates supported by the FDDR subsystem for supported
memory types. For more information on DDR Speeds, Refer to the "DDR Memory Interface
Characteristics" section in
Table 126 • DDR Speeds
Memory Type
LPDDR1
DDR2
DDR3
SmartFusion2/IGLOO2 Devices
M2S150
(FCV484)
–
√
√
–
√
√
–
√
√
–
√
√
DS0128: IGLOO2 and SmartFusion2 Datasheet.
Microsemi ProprietaryUG0446 User Guide Revision 7.0
Note. For Read Leveling, Libero SOC
M2S050/M2GL050
(FG896)
√
√
–
√
√
–
√
√
–
√
√
–
Maximum Data Rate (Mbps)
400 Mbps (200 MHz)
667 Mbps (333 MHz)
667 Mbps (333 MHz)
AC393
M2S150/M2GL150
(FC1152)
√
√
√
√
√
√
√
√
√
√
√
√
135