MT9J003I12STMUH-GEVB Datasheet MT9J003I12STMUH-GEVB, MT9J003I12STCUH-GEVB, MT9J003I12STMV-DP | P40-P42

MT9J003

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Figure 41. Using FLASH With Global Reset

ERS ERSRow Reset Integration Readout

Trigger

Wait for end of current row Automatic at end of frame readout

global_rst_end

FLASH

flash_count

(fixed)

External Control of Integration Time

If global_seq_trigger[1] = 1 (global bulb enabled) when

a global reset sequence is triggered, the end of the

integration phase is controlled by the level of trigger

(global_seq_trigger[0] or the associated GPI input). This

allows the integration time to be controlled directly by an

input to the sensor.

This operation corresponds to the shutter “B” setting on a

traditional camera, where “B” originally stood for “Bulb”

(the shutter setting used for synchronization with a

magnesium foil flash bulb) and was later considered to stand

for “Brief” (an exposure that was longer than the shutter

could automatically accommodate).

When the trigger is de-asserted to end integration, the

integration phase is extended by a further time given by

global_read_start – global_shutter_start. Usually this

means that global_read_start should be set to

global_shutter_start + 1.

The operation of this mode is shown in Figure 42. The

figure shows the global reset sequence being triggered by the

GPI2 input, but it could be triggered by any of the GPI inputs

or by the setting and subsequence clearing of the

global_seq_trigger[0] under software control.

The integration time of the GRR sequence is defined as:

IntegrationTime +

global_scale

[

global_read_start–global_shutter_start–global_rst_end

]

vt_pix_clk_freq_mhz

(eq. 18)

Where:

global_read_start + (2

global_read_start2[7 : 0] ) global_read_start1[15 : 0]

(eq. 19)

global_shutter_start + (2

global_shutter_start2[7 : 0] ) global_shutter_start1[15 : 0]

(eq. 20)

The integration equation allows for 24-bit precision when

calculating both the shutter and readout of the image. The

global_rst_end has only 16-bit as the array reset function

and requires a short amount of time.

The integration time can also be scaled using

global_scale. The variable can be set to

0–512, 1–2048, 2–128, and 3–32.

These programming restrictions must be met for correct

operation of bulb exposures:

• global_read_start > global_shutter_start

• global_shutter_start > global_rst_end

• global_shutter_start must be smaller than the exposure

time (that is, this counter must expire before the trigger

is de-asserted)

Figure 42. Global Reset Bulb

ERS ERSRow Reset Integration Readout

Trigger

Wait for end of current row

Automatic at end of frame readout

global_rst_end

GPI2

global_read_start − global_shutter_start

MT9J003

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Retriggering the Global Reset Sequence

The trigger for the global reset sequence is edge-sensitive;

the global reset sequence cannot be retriggered until the

global trigger bit (in the global_seq_trigger register) has

been returned to “0,” and the GPI (if any) associated with the

trigger function has been de-asserted.

The earliest time that the global reset sequence can be

retriggered is the point at which the SHUTTER output

de-asserts; this occurs approximately 2 * line_length_pck

after the negation of FV for the global reset readout phase.

The frame that is read out of the sensor during the global

reset readout phase has exactly the same format as any other

frame out of the serial pixel data interface, including the

addition of two lines of embedded data. The values of the

coarse_integration_time and fine_integration_time

registers within the embedded data match the programmed

values of those registers and do not reflect the integration

time used during the global reset sequence.

Global Reset and Soft Standby

If the mode_select[stream] bit is cleared while a global

reset sequence is in progress, the MT9J003 will remain in

streaming state until the global reset sequence (including

frame readout) has completed, as shown in Figure 43.

Figure 43. Entering Soft Standby During a Global Reset Sequence

ERS ERSRow Reset Integration Readout

mode_select[streaming]

system state

Software

Standby

Streaming

MT9J003

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SENSOR CORE DIGITAL DATA PATH

Test Patterns

The MT9J003 supports a number of test patterns to

facilitate system debug. Test patterns are enabled using

test_pattern_mode (R0x0600–1). The test patterns are listed

in Table 21.

Table 21. TEST PATTERNS

test_pattern_mode

Description

0 Normal operation: no test pattern

1 Solid color

2 100% color bars

3 Fade-to-gray color bars

4 PN9 link integrity pattern (only on sensors with serial interface)

256 Walking 1s (12-bit value)

257 Walking 1s (10-bit value)

258 Walking 1s (8-bit value)

Test patterns 0–3 replace pixel data in the output image

(the embedded data rows are still present). Test pattern 4

replaces all data in the output image (the embedded data

rows are omitted and test pattern data replaces the pixel

data).

HiSPi Test Patterns

Test patterns specific to the HiSPi are also generated. The

test patterns are enabled by using test_enable (R0x31C6 − 7)

and controlled by test_mode (R0x31C6[6:4]).

Table 22. HiSPi TEST PATTERNS

test_mode

Description

0 Transmit a constant 0 on all enabled data lanes

1 Transmit a constant 1 on all enabled data lanes

2 Transmit a square wave at half the serial data rate on all enabled data lanes

3 Transmit a square wave at the pixel rate on all enabled data lanes

4 Transmit a continuous sequence of pseudo random data, with no SAV code, copied on all enabled data lanes

5 Replace data from the sensor with a known sequence copied on all enabled data lanes

For all of the test patterns, the MT9J003 registers must be

set appropriately to control the frame rate and output timing.

This includes:

• All clock divisors

• x_addr_start

• x_addr_end

• y_addr_start

• y_addr_end

• frame_length_lines

• line_length_pck

• x_output_size

• y_output_size

Test Cursors

The MT9J003 supports one horizontal and one vertical

cursor, allowing a crosshair to be superimposed on the image

or on test patterns 1–3. The position and width of each cursor

are programmable in R0x31E8–R0x31EE. Both even and

odd cursor positions and widths are supported.

Each cursor can be inhibited by setting its width to “0.”

The programmed cursor position corresponds to the x and y

addresses of the pixel array. For example, setting

horizontal_cursor_position to the same value as

y_addr_start would result in a horizontal cursor being drawn

starting on the first row of the image. The cursors are opaque

(they replace data from the imaged scene or test pattern).

The color of each cursor is set by the values of the Bayer

components in the test_data_red, test_data_greenR,

test_data_blue and test_data_greenB registers. As a

consequence, the cursors are the same color as test pattern

1 and are therefore invisible when test pattern 1 is selected.

When vertical_cursor_position = 0x0FFF, the vertical

cursor operates in an automatic mode in which its position

advances every frame. In this mode the cursor starts at the

column associated with x_addr_start = 0 and advances by a

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30 P31-P33 P34-P36 P37-P39 P40-P42 P43-P45 P46-P48 P49-P51 P52-P54 P55-P55

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