AT45DB321 ATMEL Corporation, AT45DB321 Datasheet - Page 9

• Manufacturer Part Number: AT45DB321
• Description: 32-Megabit 2.7-volt Only Serial DataFlash
• Manufacturer: ATMEL Corporation

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
Waveform 1 – Inactive Clock Polarity Low
Waveform 2 – Inactive Clock Polarity High
SCK
SCK
SO
SO
CS
CS
SI
SI
HIGH IMPEDANCE
HIGH Z
tCSS
tSU
tV
tCSS
tSU
tWL
VALID IN
VALID IN
VALID OUT
tWH
tWH
tHO
tV
tH
tH
tWL
VALID OUT
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 timing that is compatible
with SPI Mode 3
tHO
tCSH
tCSH
tCS
tCS
HIGH IMPEDANCE
HIGH IMPEDANCE
tDIS
tDIS
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