NOIP1FN2000A-QDI datasheet(21/75 Pages) ONSEMI

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Dynamic Readout Parameters

It is possible to reconfigure the sensor while it is acquiring

images. Frame related parameters are internally

resynchronized to frame boundaries, such that the modified

parameter does not affect a frame that has already started.

However, there can be restrictions to some registers as

shown in Table 17. Some reconfiguration may lead to one

frame being blanked. This happens when the modification

requires more than one frame to settle. The image is blanked

out and training patterns are transmitted on the data and sync

channels.

Table 17. DYNAMIC READOUT PARAMETERS

Group

Addresses

Description

Subsampling/binning

192[7]

192[8]

Subsampling or binning is synchronized to a new frame start.

ROI configuration

195

256–303

A ROI switch is only detected when a new window is selected as the active window

(reconfiguration of register 195). reconfiguration of the ROI dimension of the active window does not

lead to a frame blank and can cause a corrupted image.

Exposure

reconfiguration

199−203

Exposure reconfiguration does not cause artifact. However, a latency of one frame is observed unless

reg_seq_exposure_sync_mode is set to ‘1’ in triggered global mode (master).

Gain reconfiguration

204

Gains are synchronized at the start of a new frame. Optionally, one frame latency can be incorporated

to align the gain updates to the exposure updates

(refer to register 204[13] − gain_lat_comp).

Freezing Active Configurations

Though the readout parameters are synchronized to frame

boundaries, an update of multiple registers can still lead to

a transient effect in the subsequent images, as some

configurations require multiple register uploads. For

example, to reconfigure the exposure time in master global

mode, both the fr_length and exposure registers need to be

updated. Internally, the sensor synchronizes these

configurations to frame boundaries, but it is still possible

that the reconfiguration of multiple registers spans over two

or even more frames. To avoid inconsistent combinations,

freeze the active settings while altering the SPI registers by

disabling

synchronization

for

the

corresponding

functionality before reconfiguration. When all registers are

uploaded, re−enable the synchronization. The sensor’s

sequencer then updates its active set of registers and uses

them for the coming frames. The freezing of the active set

of registers can be programmed in the sync_configuration

registers, which can be found at the SPI address 206.

Figure 18 shows a reconfiguration that does not use the

sync_configuration option. As depicted, new SPI

configurations are synchronized to frame boundaries.

Figure 19 shows the usage of the sync_configuration

settings. Before uploading a set of registers, the

corresponding sync_configuration is de−asserted. After the

upload is completed, the sync_configuration is asserted

again and the sensor resynchronizes its set of registers to the

coming frame boundaries. As seen in the figure, this ensures

that the uploads performed at the end of frame N+2 and the

start of frame N+3 become active in the same frame (frame

N+4).

Figure 18. Frame Synchronization of Configurations (no freezing)

Frame NFrame N+1 Frame N+2 Frame N+3

Frame N+4

Time Line

SPI Registers

Active Registers

Figure 19. reconfiguration Using Sync_configuration

Frame NFrame N+1 Frame N+2 Frame N+3 Frame N+4

Time Line

sync_configuration

SPI Registers

Active Registers

This configuration is not taken into

account as sync_register is inactive.

NOTE: SPI updates are not taken into account while sync_configuration is inactive. The active configuration is frozen

for the sensor. Table 18 lists the several sync_configuration possibilities along with the respective registers being

frozen.

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