Rainbow Electronics AT45DB041D - Manual (Page 35)

35
3595R–DFLASH–11/2012
AT45DB041D
19. Input Test Waveforms and Measurement Levels
t
R
, t
F
< 2ns (10% to 90%)
20. Output Test Load
21. AC Waveforms
Six different timing waveforms are shown on page 36 . 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. In both cases, output SO becomes valid while the
SCK signal is still low (SCK low time is specified as t
WL
). Timing waveforms 1 and 2 conform to
RapidS serial interface but for frequencies up to 66MHz. Waveforms 1 and 2 are compatible with
SPI Mode 0 and SPI Mode 3, respectively.
Waveform 3 and waveform 4 illustrate general timing diagram for RapidS serial interface. These
are similar to waveform 1 and waveform 2, except that output SO is not restricted to become
valid during the t
WL
period. These timing waveforms are valid over the full frequency range (max-
imum frequency = 66MHz) of the RapidS serial case.
AC
DRIVING
LEVELS
AC
MEASUREMENT
LEVEL
0.45V
1.5V
2.4V
DEVICE
UNDER
TEST
30pF