LUPA-1300_09 Datasheet, PDF (17/32 Pages) Cypress Semiconductor – 1.3MPxl High Speed CMOS Image Sensor

LUPA-1300
Figure 14 shows the y-address timing. The top curves are the
selection signals of the pixels, which are sequentially active,
starting by the sync pulse. The next line is selected on the
rising edge of Clock_y. It is important that the Sync_y pulse
covers 1 rising edge of the Clock_y signal. Otherwise the
synchronization will not work properly.
Figure 14. Timing of the y shift register
The first selected line after a Sync_y pulse is the line defined
by the y-address in the y-address register. Every select line is
in principle 1 clock period long, except for the first select line.
The first select line goes high as soon as a Sync_y pulse
occurs together with a rising edge of Clock_y. On the next
rising edge of Clock_y, the next row is selected, unless Sync_y
is still active. In Figure 15, a short Sync_y pulse makes sure
that the first row is selected during 1 period of Clock_y.
Once a line is selected, it needs to stabilize first of all, which is
called the row blanking time, and secondly the pixels need to
be read out. Figure 15 shows the principle.
Figure 15. Readout time of a line is the sum of the row blanking time and on the line readout time.
Symbol
a
b
c
d
Name
Sync_Y
Sync_Y-Clock_Y
Clock_Y-Sync_Y
Sync_X -Clock_X
Value
> 100 nsec
> 50 nsec
> 50 nsec
> 50 ns
Notes
13. The applied Clock_x, is filtered on chip to remove spikes. This is especially required at these high speeds. This filtering results in an on chip Clock_x that is
delayed in time with about 10 nsec. In other words, the data at the output has, with respect to the external Clock_x, a propagation delay of 20 nsec. This 20 nsec
come from 10 nsec of the generation of the internal Clock_x and 10 nsec due to other on chip generated signals.
14. The analog signal will come out of the sensor with a 60/40 duty cycle. Therefore it is very important to have a very flexible ADC clock phase. This is necessary
to fine-tune the ADC to sample the analog signal at the correct moment.
Document Number: 38-05711 Rev. *C
Page 17 of 32
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