DDR Memory Types, Densities, and Data Widths

Zynq UltraScale+ Device Technical Reference Manual (UG1085)

Document ID
UG1085
Release Date
2023-12-21
Revision
2.4 English

The DDR memory controller is able to connect to devices under the conditions listed in Table: System Memories.

Table 17-1:      DDR Memory Controller Conditions

Parameter

Value

Notes

Maximum total memory density (GB)

34

This is the maximum supported density.

Total data width (bits)

16, 32, 64

16 and 64-bit LPDDR4 are not supported. 16-bit is supported for DDR4 only.

Component memory density (Gb per die)

0.5, 1, 2, 4, 6, 8, 12, 16

3, 6, 12 and 16Gb single-channel LPDDR4 are not supported.

6, 12, 24 and 32Gb dual-channel LPDDR4 are not supported.

Component data width (bits)

8, 16, 32

4-bit devices not supported. Byte-mode LPDDR4 devices not supported.

Number of ranks

2

 

Number of row address bits

17(2)

Limited by the memory controller.

Number of bank address bits

3

 

Bank group

2

 

MEMC_FREQ_RATIO

2

DDR PHY to controller clock ratio (2:1).

Notes:

1.3DS DDR4 is not supported in PS.

2.LPDD4 support is limited to 16 row bits. DDR4 support is limited to 17 row bits. DDR3, DDR3L, and LPDDR3 are limited by their DRAM specifications.

 

,

 

 

Table: Example Memory Configurations lists some memory configuration examples. The memory configuration speeds are listed in the Zynq UltraScale+ MPSoC Data Sheet: DC and AC Switching Characteristics (DS925) [Ref 2].

Table 17-2:      Example Memory Configurations

Technology

Configuration

Number of Components

Total Width

Component Density

Capacity

Rank

DDR3 (with ECC)

x8

9

72

4 Gb/8 Gb

4 GB/8 GB

1 and 2

DDR3 (with ECC)

x16

5

72

2 Gb

 

1

DDR3L (with ECC)

x8

9

72

4 Gb/8 Gb

4 GB/8 GB

1 and 2

DDR3L (with ECC)

x16

5

72

2 Gb

 

1

LPDDR3

x32

2

64

4Gb

 

1

DDR4

x8

8

64

8 Gb/16 Gb

8 GB/16 GB

1 and 2

DDR4 (with ECC)

x16

5

72

8 Gb

 

1

LPDDR4

x32

1

32

8 Gb

 

1

LPDDR4

x32 with DDP

1

32

16 Gb

 

2

LPDDR4 (with ECC)

x32

2

40

8 Gb

 

1

Note:   Table: Example Memory Configurations lists just some of the possible memory configurations. Other configurations are possible.