STV-USBSLASHCIF-R01 datasheet(50/105 Pages) STMICROELECTRONICS

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Digital Video Interface Format

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8.8

Power-up, Low-power and Sleep modes

Please note that the following descriptions of low power and sleep modes assumes that the user has selected the optional 4 wire

output mode, that is D[3:0] will transmit the digital video data. If the 5-wire or 8-wire modes are selected the same basic behaviour

is followed however the contents of the data bus will differ slightly.

8.8.1

Power-Up/Down (Figure 29)

The sensor enters low-power mode on power-up. On power-up all of the data bus lines are driven high immediately and the

device is in low-power mode (Section 8.8.2).

The sensor will remain in the low power mode until the external host sends the appropriate message over I2C to clear the low

power bit - bit0 of serial reguister, setup0, index 1016.

After the “Exit Low-Power Mode” command has been sent the sensor will output for one frame, a continuous stream of alternating

9H and 6H values on D[3:0] The patterns generated in 5 and 8 wire modes are given in Table 16 below. By locking onto the

resulting 0101/1010 patterns appearing on the data bus lines the host can determine the best sampling position for the nibble

data. After the last 9H 6H pair has been output the data bus returns to FH,(1FH in 5 wire mode), until the start of fifth frame. At this

point the first active video frame will be output. After the host has determined the correct sampling position for the data, it should

then wait for the next start of frame line (SOF).

PU0

System Power Up

PU1

Sensor enters low power mode and databus bits driven high.

PU2

Host enables the sensor clock, CLKI.

PU3-PU4

The host sends a “Soft-Reset” command to the sensor via the serial interface. This ensures that

the sensor is in low-power mode.

PU5

Host issues command to remove sensor from low-power mode.

PU6-PU7

Sensors begins execution 4 frame start sequence.

PU8-PU9

One frame of alternating 9H & 6H data on D[3:0] for the host to determine the best sampling

phase for video data.

PU10-PU11

4 Frames after the “Exit Low-Power Mode” serial comms, the sensor starts outputing valid video

data.

Table 15 : Typical System Power-Up

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