S25FL127S
2.14 Do Not Use (DNU)
A device internal signal may be connected to the package connector. The connection may be used by Cypress for test or other
purposes and is not intended for connection to any host system signal. Any DNU signal related function will be inactive when the
signal is at VIL. The signal has an internal pull-down resistor and may be left unconnected in the host system or may be tied to VSS.
Do not use these connections for PCB signal routing channels. Do not connect any host system signal to these connections.
2.15 Block Diagrams
Figure 2. Bus Master and Memory Devices on the SPI Bus - Single Bit Data Path
Reset#
WP#
SI
SO
SCK
Reset#
WP#
SI
SO
SCK
CS2#
CS1#
CS1#
CS2#
SPI
Bus Master
FL127S
Flash
FL127S
Flash
Figure 3. Bus Master and Memory Devices on the SPI Bus - Dual Bit Data Path
Reset#
WP#
IO1
IO0
SCK
Reset#
WP#
IO1
IO0
SCK
CS2# CS1#
CS1#
CS2#
SPI
Bus Master
FL127S
Flash
FL127S
Flash
Document Number: 001-98282 Rev. *I
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