User's Manual l TQMa8XxS UM 0101 l © 2022, TQ-Systems GmbH
Page 14
The i.MX 8X supports MMC card transmission modes up to the current eMMC standard v5.
The I/O voltage is 1.8 V to support the maximum clock rate of 200 MHz. This allows a data rate of up to 400 Mbyte/s in DDR mode
(HS400).
The eMMC can be used as boot medium. The boot configuration is described in 3.2.1.3.
Additional series terminations are inserted in the data and clock signals to influence the driver strength starting from the eMMC.
The standard eMMC size is 8 GByte. Variants with 4 GByte, 16 GByte, 32 GByte, 64 GByte and without eMMc are available. The
standard eMMC ist SanDisks SDINBDG4-8G-T (8 GByte/5.1/SLC).
3.2.2.3
QSPI NOR flash
The i.MX 8X provides two QSPI interfaces, which can be combined to an Octal-SPI or Twin-Quad-SPI on the TQMa8XxS.
In addition, both interfaces feature a data strobe signal with a maximum clock rate of up to 200 MHz,
which however, is only
used with QSPI_A. The second QSPI interface is also available on SMARC pins.
i.MX 8X
QSPIA_DATA[3:0]
SPI-NOR
Octal-/Twin-Quad
QSPI-NOR
D[3:0]
D[7:4]
SMARC-Pins
QSPIA_DQS
DQS
QSPIA_SS[1:0]_B
C1
QSPIA_SCLK
QSPIB_DATA[3:0]
QSPIB_SS[1:0]_B
QSPIB_SCLK
S1#
S2#
C2
ESPI_CK
ESPI_IO_[4:0]
ESPI_CS[1:0]#
ESPI_ALERT0
MIPI_DSI1_I2C0_SCL
ESPI_RESET#
SPI0_CS1
OPT
OPT
OPT
Figure 6:
Block diagram QSPI
Different types of serial NOR-Flashes can be used on the TQMa8XxS, which use one or both QSPI interfaces depending on the
type. The following types can be used:
•
QSPI Flash - Simple NOR-Flashes use only one of the two QSPI interfaces. The remaining balls of the second interface
are not connected internally and can be used via the module connectors on the mainboard.
•
Octal-SPI / Twin-Quad-SPI - These NOR Flashes represent a dual die Flash, which uses additional pins for the second
QSPI interface compared to the single NOR Flash. The latter cannot be used on the mainboard in this case. All signals of
the QSPIB interface are to be treated as NC in this case.
•
Hyperflash / Xccela Flash - The modern serial Flash devices are connected similar to an Octal-SPI / Twin-Quad-SPI, but
have a DQS signal (RX clock) to increase the transfer rate. Thus, up to 400 MB/s can be achieved. Also in this case, the
QSPIB interface cannot be used on the mainboard.
