STV-5301-E01 Ver la hoja de datos (PDF) - Vision

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STV-5301-E01

Mono and Colour QSIF Digital Video CMOS Image Sensors

Vision 

VV5301 & VV6301

Digital Video Interface Format

7. Digital Video Interface Format

The video interface consists of a bidirectional, tri-stateable 5-wire data bus. The nibble transmission is synchronised to the rising

edge of the system clock.

Read-out Order

Form of encoding

Correspondence between video signal

levels and quantisation levels:

Progressive Scan (Non-interlaced)

Uniformly quantised, PCM, 8/10 bits per sample

The internal10-bit pixel data is clipped to ensure that 0H and 3FFH (5

Wire) or FFH (4/8 Wire) values do not occur when pixel data is being

output on the data bus.

VV5301/VV6301

8-Bit Data

Pixel Values

1 to 254

Black Level

16

Digital video data is 8 bits per sample in VV5301 and VV6301. The data can be transmitted in the following ways:

• A single 8 bit byte over 8 output wiresnote.

• A series pair of 4-bit nibbles, most significant nibble first, on 4 wires.

8-bit Pixel Data

8- wire Output Mode

4 - wire Output Mode

....D2,D1,D0

D3,D2,D1,02

D7,D6,D5,D4,D3,D2,D1,D0

D7,D6,D5,D4

D3,D2,D1,D0

Figure 6 : Output Modes

D7,D6,D5.........

D7,D6,D5,D4

7.1 Embedded control data

To distinguish the control data from the sampled video data all control data is encapsulated in embedded control sequences.

These are 6 bytes long and include a combined escape/sync character sequence, 1 control byte (the ‘command byte’) and 2

bytes of supplementary data.

To minimise the susceptibility of the embedded control data to random bit errors redundant coding techniques have been used to

allow single bit errors in the embedded control words to be corrected. However, more serious corruption of control words or the

corruption of escape/sync characters cannot be tolerated without loss of sync to the data stream. To ensure that a loss of sync is

detected a simple set of rules has been devised. The four exceptions to the rules are outlined below:

1. Data containing a command word that has two bit errors.

2. Data containing two ‘end of line’ codes that are not separated by a ‘start of line’ code.

3. Data preceding an ‘end of field’ code before a start of frame’ code has been received.

4. Data containing line that do not have sequential line numbers (excluding the ‘end of field’ line).

If the receiving software or hardware detects one of these violations then it should abandon the current field of video

7.1.1 The combined escape and sync character

Each embedded control sequence begins with a combined escape and sync character that is made up of three words. The first

two of these are FFH FFH- constituting two words that are illegal in normal data. The next word is 00H - guaranteeing a clear

16/50

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