33.12.2.1 SDR mode
Most flash memories operate in single data rate (SDR) mode. In SDR mode, the data is
transferred only on one edge of the clock signal. The SDR serial flash memories sample
the incoming data on the rising edge of serial flash clock and drive the output data on the
falling edge of the serial flash clock.
33.12.2.1.1 Internal sampling
NOTE
This mode may not be available on this chip. See the chip-
specific QuadSPI information for the read modes that this chip
supports.
QuadSPI uses different edges of the internal reference clock for sampling the input data
in SDR mode.
internal reference for serial flash data sampling
internal ref clock
SCK - serial flash clock
serial flash data
t
Del,total
Possible Sampling Points
N/1
N/2
I/2
I/1
Figure 33-9. Internal sampling in SDR mode
The possible points in time for sampling incoming data are denoted as N/1, I/1, N/2 and
I/2 above. The sampling point relevant for the internal sampling is configured in the
QSPI_SMPR register. Refer to
Sampling Register (QuadSPI_SMPR)
following table gives an overview of the available configurations for the commands
running at regular (full) speed:
Chapter 33 Quad Serial Peripheral Interface (QuadSPI)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
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