System Clock; Flash; Qspi Nor Flash; Emmc / Sd Card - TQ-Systems TQMLS1028A Preliminary User's Manual

4.5

System Clock

The system clock is fixed at 100 MHz. Spread spectrum clocking is not possible.
4.6

Flash

Assembled on TQMLS1028A:

• QSPI NOR Flash

• eMMC NAND Flash, Configuration as SLC is possible (higher reliability, half capacity)
External removable storage device:
• SD card (on MBLS1028A)
All above mentioned options, except NAND flash, are supported (external SD card on carrier board).
4.6.1 QSPI NOR Flash
• QSPI flash with 1.8 V I/O voltage, 4 or 8 bidirectional data lines, separate read strobe.
• Software support for STR and DTR.
• 64 to 512 MByte
4.6.2

eMMC / SD card

The LS1028A CPU provides two SDHC interfaces. One is for SD cards (with switchable I/O voltage), the other for eMMC (with fixed
I/O voltage).
Illustration 8: Block diagram eMMC interface
The eMMC is connected to SDHC2. The maximum transfer rate corresponds to the HS400 mode (eMMC from 5.0).
4.7

SDRAM

DDR4 SDRAM is used on the TQMLS1028A. Expansion stages with 1, 2, 4 or 8 GB are possible.
Preliminary User's Manual l TQMLS1028A UM 0001 l © 2019, TQ-Systems GmbH
LS1028A
SDHC2_CLK
SDHC2_CMD
SDHC2_DATA[7:0]
SDHC2_RESET_B
SDHC2_STROBE
1.8 V 3.3 V
eMMC 5.x
VCC
VCCQ
CLK
CMD
DAT[7:0]
RST#
DS
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