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CSG14K_CSG8K

Functional Description

Datasheet

• PUBLIC

DS000571

• v2-01 • 2023-Feb-10

113

│ 75

Despite the naming of the L(ong) and S(hort) groups, it is allowed to have a shorter exposure

time for the L group than for the S group.

Dual exposure mode is also supported in Full External control mode. In this control mode, the

rising edge of REQ_EXP starts the exposure of the L group and the falling edge of REQ_EXP

starts the exposure of S. This behavior is illustrated in Figure 56. If DUAL_EXPOSURE is

low, both groups are started with the rising edge of REQ_EXP.

Minimal Frame Time Constraint

The frame time has a minimum value requirement to guarantee the entire frame readout and

exposure is completed successfully before a new frame starts. This minimum requirement is

captured in the equation:

Equation 6:

�� > ��glob + ��

��ℎ: �� = �� ∙ (�� + �� + ��)

The components of this equation are:

Figure 90:

Minimal Frame Time Dependencies

Component

Description

Equation

tframe

Target Frame time (= 1 / max frame rate)

FRAME_TIME

· TU

tglob

Length GLOB state

GLOB_TIME

· TU

trow

Row length

ROW_LENGTH

· tCLK_PIX

Nfval

Number of valid rows in frame

sum(YWINenabled.SIZE)

Ndummy

Number of dummy rows in frame

IMG.3: 3

Others: 7

Nstats

Number of image statistics rows in frame

STAT_NROF_HIST

TU is time unit expressed in seconds, not to be confused with contents of register

TIME_UNIT. The tread component corresponds to the length of the READOUT state used in

section 7.2.6.

In the external control modes, the same frame time equation should be respected to not

interrupt the readout of active frames.

The Ndummy component represents a number of dummy rows read out between the GLOB and

READOUT phase. Depending on the configuration used, this number varies between 3 and 7.

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