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AT45DB021B
9. AC Waveforms
Two different timing diagrams are shown below. Waveform 1 shows the SCK signal being low
when CS makes a high-to-low transition, and Waveform 2 shows the SCK signal being high
when CS makes a high-to-low transition. Both waveforms show valid timing diagrams. The setup
and hold times for the SI signal are referenced to the low-to-high transition on the SCK signal.
Waveform 1 shows timing that is also compatible with SPI Mode 0, and Waveform 2 shows tim-
ing that is compatible with SPI Mode 3.
9.1
Waveform 1 – Inactive Clock Polarity Low and SPI Mode 0
CS
t CS
t CSS
t WH
t WL
t CSH
SCK
t V
t HO
t DIS
SO
HIGH IMPEDANCE
VALID OUT
HIGH IMPEDANCE
SI
t SU
VALID IN
t H
9.2
Waveform 2 – Inactive Clock Polarity High and SPI Mode 3
CS
t CS
t CSS
t WL
t WH
t CSH
SCK
t V
t HO
t DIS
SO
HIGH Z
VALID OUT
HIGH IMPEDANCE
SI
t SU
VALID IN
t H
15
1937J–DFLSH–9/05
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