2.16.4 Parameters
Please refer to the Mercury XU5 SoC module reference design [2] for DDR4 settings guidelines.
The DDR4 SDRAM parameters to be set in the Vivado project are presented in Table 24.
The values given in Table 26 are for reference only. Depending on the equipped memory device on the
Mercury XU5 SoC module and on the DDR4 SDRAM frequency, the configuration may be different to the
one in the reference design. Please refer to the memory device datasheet for details.
Parameter Value
Memory Device Interface Speed (ps) 938
Reference Input Clock Speed (ps) 10000 (100 MHz)
10
Memory Part MT40A256M16 / MT40A512M16 / MT40A1G16
11
Data Width 16
Data Mask and DBI DM NO DBI
Cas Latency 16
Cas Write Latency 11
Table 26: DDR4 SDRAM (PL) Parameters
11
2.17 QSPI Flash
The QSPI flash can be used to boot the PS, and to store the FPGA bitstream, ARM application code and
other user data.
2.17.1 QSPI Flash Type
Table 27 describes the memory availability and configuration on the Mercury XU5 SoC module.
As there is one QSPI flash chip equipped on the Mercury XU5 SoC module, type “single” must be selected
when programming the flash from Vivado tools.
Flash Type Size Manufacturer
S25FL512S 512 Mbit Cypress (Spansion)
Table 27: QSPI Flash Type
Warning!
Other flash memory devices devices may be equipped in future revisions of the Mercury XU5 SoC
module. Please check the user manual regularly for updates.
10
An exact period of 10000 ps may not be achievable. The clock speed closest to the desired frequency should be selected.
11
The memory devices equipped on the module may not be available in Vivado. In this case, a similar memory part with compatible
timing requirements should be selected.
D-0000-445-001 41 / 64 Version 07, 25.07.2019
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