Parameter Value
Memory Device Interface Speed (ps) 833
Reference Input Clock Speed (ps) 10000 (100 MHz)
11
Memory Part MT40A256M16 / MT40A512M16
12
Data Width 32
Data Mask and DBI DM NO DBI
Cas Latency 17
Cas Write Latency 12
Table 27: DDR4 SDRAM (PL) Parameters
12
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 28 describes the memory availability and configuration on the Mercury+ XU8 SoC module.
As there is one QSPI flash chip equipped on the Mercury+ XU8 SoC module, type “single” must be selected
when programming the flash from Vivado tools.
Flash Type Size Manufacturer
S25FL512S 512 Mbit Cypress (Spansion)
Table 28: QSPI Flash Type
Warning!
Other flash memory devices devices may be equipped in future revisions of the Mercury+ XU8 SoC
module. Please check the user manual regularly for updates.
2.17.2 Signal Description
The QSPI flash is connected to the PS MIO pins 0-5. Some of these signals are available on the module
connector, allowing the user to program the QSPI flash from an external source.
The reset of the QSPI flash is connected to the PS_POR#_LV power-on reset signal.
Please refer to Section 3 for details on programming the flash memory.
11
An exact period of 10000 ps may not be achievable. The clock speed closest to the desired frequency should be selected.
12
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-0000-454-001 37 / 60 Version 06, 18.11.2019
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