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XGS Family

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WAIT_ON_TRIGGER state, in which it is ready to

accept a new trigger event.

Note that this mode is available for both triggered and

non−triggered global shutter modes and it can be combined

with the use of multiple contexts. When using multiple

contexts it is also possible to configure the number of desired

frames per context. The sequencer cycles through the active

contexts and generates as many frames as configured per

context. When retriggered, the sequencer reinitializes the

frame properties and starts the readout from a fresh state (i.e.

does not continue from where it ended in the previous

batch).

LINE TRIGGERED READOUT

Figure 22. Line Triggered Readout

Idle

Integrating

Readout

EFOT

Frame N

Frame N+1

Exposure State

TRIG_INT

TRIG_RD

(No effect on falling edge)

= Start of New Line

= Readout

SFOT

Reset

Idle

Integrating

EFOT

SFOT

Reset

EFOT

integration length

The line triggered readout mode is enabled when

line_trigger_en is asserted and frame_trigger_en is

deasserted. The line triggered readout mode is comparable

to frame triggered readout, but in this mode only one line is

read out for each trigger. Note that a trigger is latched and

interpreted during the following line period if the sensor is

retriggered during readout.

Line triggered readout is to be used in conjunction with

triggered integration modes.

Features Overview

The XGS family has a wide array of features to enhance

functionality or to increase versatility. A summary of

features follows.

RESET

The RESET_N input (pin F8) is an active low control

input for asynchronous hard reset. During the power−up

period, RESET_N must be asserted, then must be deasserted

after the power supplies are settled. The minimum

RESET_N assert time is 30 EXTCLK cycles.

MONITOR OUTPUTS

The XGS sequencer provides three monitor outputs (pins

E8, D8 and D7) which can be used to monitor the internal

states of the sequencer. The monitor signals can be

configured separately for each monitor output.

CONTEXT SWITCHING

XGS supports up to three contexts which allow the user to

program a number of configurations and let the sensor cycle

through these. Switching from one context to another is done

at the start of a frame and cannot corrupt the ongoing

readout. The registers that control the switching are grouped

in the contexts_reg. The active context switching can be

done manually by changing the value in the active_contexts

the sequencer will cycle through two or three contexts

sequentially as depicted in Figures 23 and 24.

• Two Context Switching

(context_reg.active_contexts = 0x3)

context 0

→ context 1 → context 0...

Context 0

Context 1

Figure 23. Two Context Switching

• Three Context Switching

(context_reg.active_contexts = 0x7)

context 0

→ context 1 → context 2 → context 0...

Context 0

Context 1

Context 2

Figure 24. Three Context Switching

• Multiple Frame Context Switching

In addition to defining up to three contexts, the number

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