This section provides details on the available configurations for the different memory types supported in PolarFire devices.
The PolarFire DDR Subsystem supports non-3DS DDR4 devices.
DDR4 SDRAM is available in dual in-line memory modules (DIMM), small outline DIMMs (SO-DIMM), and as discrete devices. For information about the number of rows, columns, and bank bits required for DIMM or SO-DIMM configuration, refer to the data sheet associated with the DIMM module connected to the PolarFire device.
The following table lists the number of row bits, column bits, bank bits, and chip selects required for standard discrete DDR4 SDRAM devices in non-3DS configurations.
Stack/Chip Size | Configuration | Row Bits | Column Bits | Bank Group Bits | Bank Bits |
---|---|---|---|---|---|
2 | 128M × 16 | 14 | 10 | 1 | 2 |
64M × 32 | 13 | 10 | 1 | 2 |
The following table lists the number of row bits, column bits, and bank bits required for standard discrete DDR3, LPDDR3, and SDRAM devices.
Memory Type | Chip Size | Configuration | Row Bits | Column Bits | Bank Bits |
---|---|---|---|---|---|
DDR3 | 512 Mb | 32M × 16 | 12 | 10 | 3 |
1024 Mb | 64M × 16 | 13 | 10 | 3 | |
2048 Mb | 128M × 16 | 14 | 10 | 3 | |
4096 Mb | 256M × 16 | 15 | 10 | 3 | |
8192 Mb | 512M × 16 | 16 | 10 | 3 | |
LPDDR3 | 4 Gb | 128M × 32 | 14 | 10 | 3 |
6 Gb | 192M × 32 | 15 | 10 | 3 | |
8 Gb | 128M × 32 | 15 | 10 | 3 | |
12 Gb | 384M × 32 | 15 | 11 | 3 | |
16 Gb | 512M × 32 | 15 | 11 | 3 |