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CSG14K_CSG8K

Functional Description

Datasheet

• PUBLIC

DS000571

• v1-00 • 2020-Dec-15

112

│ 72

Equation 4. Parameter GLOB_BASE is image mode dependent (see Figure 61).

Equation 4:

��_�� = �� (

��_��

��_��[��]

)

Setting register TIME_UNIT to fCLK_PIX [MHz] results in usage of an internal time unit of approximately

1 µs. The (minimal) frame time and exposure time, as set with the MIN_FRAME_TIME and

EXP_TIME_* registers now represent multiples of ~1 µs.

In case of image mode IMG.4 at nominal data rate, the CLK_PIX frequency is 83.33 MHz (=1000 MHz

/ 12). In case register TIME_UNIT is set to 83, this results in a time unit (TU) of 0.996 µs (=83 /

83.33 MHz). Reducing the nominal data rate in this mode slightly to 996 Mbit/s yields a time unit of

exactly 1 µs. Similarly (also valid in image mode IMG.4 at nominal data rate), the table below shows

the resulting frame and exposure time in case of a time unit of ~2.5 µs.

Figure 85:

Example: Relationship Between Exposure and Frame Time to Time Unit in IMG.4.

Default Setting

Equation

Effective

TIME_UNIT

208

208 / fCLK_PIX [MHz]

2.496 µs

MIN_FRAME_TIME

5000

5000 TU

12.84 ms (~100 fps)

EXP_TIME_L

1000

1000 TU

2.496 ms

Frame and exposure time registers are both 16-bit wide, which means that the exposure time can be

specified with a resolution of up to 1/65536 with respect to the frame time.

MIN_FRAME_TIME defines the minimal frame time, in case the minimal frame period is constrained

by the readout, rather than the exposure. The actual frame time is adjusted automatically by the

sensor for longer exposure times, as soon as the exposure time becomes dominant over the readout

time. For the sensor to detect this condition, it needs to be aware of the duration of the global

sampling state (GLOB, refer to Basic Frame Timing in 7.2.6). This is done using the register

GLOB_TIME, expressed in TU. Register GLOB_TIME needs to be set according to the equation

below, which depends on the previously set register GRAN_TG and image mode dependent

parameter GLOB_LENGTH (see Figure 61).

Equation 5:

GLOB_TIME = ceil (GLOB_LENGTH ∗

��_��

)

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