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The data read out from the external serial flash device by the QuadSPI module is
stored in the internal buffers.The means of accessing the data from the buffer differs
depending on which buffer the data has been loaded to. Refer to
details about the two available buffers, the RX Buffer and the AHB Buffer, in the
QuadSPI module:
Memory mapped access
Register access (RBDR)
RX
Buffer
TX
Buffer
Memory mapped access
ARDB access
This buffer is transparent to the user and is non-memory mapped.
See 'Flexible AHB Buffer' section for details.
AHB
Buffer
Byte Swapper for endianness
Note:
READ ACCESS
READ ACCESS
WRITE ACCESS
S
yst
em AHB/IPS
Ext
er
nal Flash
QuadSPI
Figure 33-7. QuadSPI memory map
• The RX Buffer is implemented as FIFO of depth 32 entries of 4 bytes. Its content
is accessible in two different address areas both referring to the identical data
and the same physical memory.
In the IPS address space in the area associated to QSPI_RBDR0 to QSPI_RBDR31
In the AHB address space in the area associated to QSPI_ARDB0 to QSPI_ARDB31. Two
successive entries are accessed with one single 64 bit AHB read operation.
Chapter 33 Quad Serial Peripheral Interface (QuadSPI)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
897
Содержание MWCT101 S Series
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