NXP Semiconductors i.MX 8M Nano UltraLite DDR3L, Руководство пользователя по оборудованию, Страница: 9 / 17

Table 3. Power rails (continued)
SEQ Power rail Regulator Value/V
5 VDD_SOC PCA9450B BUCK1 0.85/0.95
1
6 VDDA_1V8 PCA9450B LDO3 1.8
7 VDD_1V8/NVCC_1V8 PCA9450B BUCK5 1.8
8 NVCC_DRAM_1V35 PCA9450B BUCK6 1.35
9 VDD_3V3/NVCC_3V3 PCA9450B BUCK4 3.3
9 NVCC_SD2 PCA9450B LDO5 3.3/1.8
10 POR_B PCA9450B —
11 VDD_PHY_1V2 PCA9450B LDO6 1.2
1. PCA9450B BUCK1 default output voltage is 0.85V. Software will change it to 0.95 V for overdrive mode in SPL before
DDR initialization.
2.4 DDR3L DRAM memory
The i.MX 8M Nano UL DDR3L EVK has one 16 bit DDR3L SDRAM chip, MT41K512M16VRP-107, for a total of 1 GB
RAM memory.
In the physical layout, the DDR3L chip is placed on the TOP side, the data traces are not necessarily connected to the DDR3L
chips in sequential order, but for ease of routing, are connected as best determined by the layout and other critical traces.
The
DRAM_VREF
can be generated by i.MX 8M Nano UL internally, so it does not need to use external power supply and decoupling
capacitors. The calibration resistors used by the DDR3L chips and processor are 240 Ω 1% resistors. There is no differential
termination resistors for DRAM Clock because of the point to point topology. Developers can add a termination resistor on Clock
if two or more DRAMs used on the board, and the value of the resistor is depending on simulation and test result.
2.5 eMMC memory (U4)
The eMMC memory is connected to the uSDHC3 interface of i.MX 8M Nano UL, and it can support up to eMMC 5.1 device. The
eMMC memory is on the 8MNANOD3L-CPU board, and the part number is SDINBDG4-32G-I1. It is the default boot device of the
EVK. The boot settings are as shown in
Table 2 .
2.6 QSPI Nor Flash (U5)
The QSPI memory is connected to the FlexSPI interface of i.MX 8M Nano UL, and it can support up to 166 MHz DDR mode device.
The QSPI memory is on the 8MNANOD3L-CPU board, and the part number is MT25QU256ABA1EW7-0SIT. To select it as the
boot device of the EVK, see
Table 2 .
2.7 SD card slot (J701)
There is one MicroSD card slot, J701, on the 8MMINI-BB board, connecting to the uSDHC2 interface of i.MX 8M Nano UL. This
connector supports one 4-bit SD3.0 MicroSD card. To select it as the boot device of the EVK, see
Table 2 .
NXP Semiconductors
Specifications
i.MX 8M Nano UltraLite DDR3L Evaluation Kit Hardware User's Guide, Rev. 0, March 2, 2021
User's Guide 9 / 17