2.3.3 DSPI interface
Serial peripheral interface (SPI) usually means deserial serial peripheral interface (DSPI)
on the LS1043ARDB. The SPI pins of the LS1043ARDB can be used to access the
following devices:
• Onboard SPI devices: For various SPI memory devices
• Offboard (TDM riser) device: For SLIC/SLAC interface circuitry
The LS1043ARDB has a DSPI master controller that is used to communicate with
various peripherals. The LS1043ARDB DSPI has the following features:
• SPI flash memory
• LS1043A OVDD supports 1.8 V on the LS1043ARDB.
• LS1043A SPI_CS[0:3] are muxed with LS1043A SDHC_DAT[4:7]. Muxes are used
on the board.
The figure below shows the LS1043A connections for DSPI.
LS1043A
SPI_MOSI
SPI_MISO
SPI_CLK
SPI_CS[0:3]/
SDHC_DAT[4:7]
Level
shifter
OVDD = 1.8 V
SPI flash
(N25Q128A
13EF840E)
3.3 V
OVDD
Level
shifter
MUX
1:2
3.3 V
1.8 V
1.8 V
SPI_CS[0:3]_B
SD_DATA[4:7]
SW3[8]
0
1
SPI_CS0_B
K22
MCU
TDM
riser
card
SPI_CS1_B
SPI_CS2_B
SPI_CS3_B
= 1.8 V
Figure 2-5. DSPI connections
NOTE
Some DSPI pins are muxed with eSDHC pins; therefore, DSPI
functionality depends on the eSDHC configuration.
The table below describes the LS1043ARDB SPI flash memory.
Chapter 2 Interfaces
QorIQ LS1043A Reference Design Board Reference Manual, Rev. 0, 08/2015
Freescale Semiconductor, Inc.
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