Note that the “Feedback Clk” option on pin MIO8 must be enabled in the Zynq configuration for clock rates
higher than 30 MHz.
24-bit Address Compatibility Mode
If the Zynq device boots from the QSPI flash and the 24-bit address compatibility mode of the QSPI flash is
used to access the range above 16 MB, then the compatibility mode must be disabled before a system reset
is executed. Otherwise, the Zynq device will not be able to boot from the QSPI flash again, as the address
register is not pointing to the lower addressed part of the memory, in which the boot image is located.
The reset of the QSPI flash is connected to the PS_POR# power-on reset signal in order to avoid this issue
after a power-on reset. The PS_SRST# signal should not be used in this setup.
Please refer to Zynq-7000 Technical Reference Manual [18] for details on booting from the QSPI flash.
2.16 NAND Flash
The NAND flash can be used to store ARM application code and other user data, and optionally to boot the
PS and to store the FPGA bitstream. Refer to Section 3.3.2 for details.
The NAND flash is disabled when VCC_CFG_PS_B13_B33 is 1.8 V. The NAND_ENABLE signal, which controls
the CE# pin of the NAND flash, is set automatically to GND (if VCC_CFG_PS_B13_B33 is less than or equal to
1.8 V) or to VCCO (if VCC_CFG_PS_B13_B33 is 2.5 V or 3.3 V).
2.16.1 NAND Flash Type
Table 23 describes the memory availability and configuration on the Mars ZX3 SoC module.
Flash Type Size Manufacturer
MT29F4G08ABADAWP 4 Gbit Micron
Table 23: NAND Flash Type
2.16.2 Signal Description
The NAND flash is connected to the PS MIO pins 0, 2-14. The MIO pins 2-6 are shared between the QSPI
and NAND flash.
The write protect pin (WP#) of the NAND flash is connected to pin V13, available from the FPGA logic, and
has an on-board pull-up resistor.
2.16.3 Parameters
Please refer to the NAND flash memory device datasheet to extract the required parameter values. Refer-
ence values to be used in Vivado are given in Table 24.
The indicated parameter values may be used for booting from NAND flash memory on the Mars ZX3 SoC
module.
D-0000-424-004 28 / 48 Version 05, 21.08.2018
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