AR0141CS
When the slave mode becomes active, the sensor will
pause both row read and row reset operations. (Note: The
row integration period is defined as the period from row
reset to row read.) The frame−time should therefore be
configured so that the slave mode “wait period” is as short
as possible. In the case where the sensor integration time is
shorter than the frame time, the “wait period” will only
increase the integration of the rows that have been reset
following the last VD pulse.
The period between slave mode pulses must also be
greater than the frame period. If the rising edge of the VD
pulse arrives while the slave mode is inactive, the VD pulse
will be ignored and will wait until the next VD pulse has
arrived.
To enter slave mode:
1. While in soft−standby, set R0x30CE[4] = 1 to
enter slave mode
2. Enable the input pins (TRIGGER) by setting
R0x301A[8] = 1
3. Enable streaming by setting R0x301A[2] = 1
4. Apply sync−pulses to the TRIGGER input
FRAME READOUT
The sensor readout begins with vertical blanking rows
followed by the active rows. The frame readout period can
be defined by the number of row periods within a frame
(frame_length_lines) and the row period
Row Reset
1/60s
1/60s
Row Read Row Reset
(line_length_pck/clk_pix). The sensor will read the first
vertical blanking row at the beginning of the frame period
and the last active row at the end of the row period.
Row Read
Vertical Blanking
Active Rows
Time
Serial SYNC Codes
Start of Vertical Blanking
Start of Frame
Start of Active Row
End of Line
End of Frame
Frame Valid
Row Reset
Row Read
HB (370 Pixels/Column)
1280 x 720
Row Reset
End of Frame
Readout
Row Read
HB (370 Pixels/Column)
1280 x 720
End of Frame
Readout
Line Valid
Note:
The frame valid and line valid signals mentioned in this diagram represent internal signals within the sensor. The SYNC
codes represented in this diagram represent the HiSPi Streaming−SP protocol.
Figure 29. Example of the Sensor Output of a 1280 x 720 Frame at 60 fps
Figure 29 aligns the frame integration and readout
operation to the sensor output. It also shows the sensor
output using the HiSPi Streaming−SP protocol. Different
sensor protocols will list different SYNC codes.
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