參數(shù)資料
型號(hào)： STV6404E-001
廠商： 意法半導(dǎo)體
英文描述： Mono and Colour Digital Video CMOS Image Sensors
中文描述： 莫諾和數(shù)字視頻彩色CMOS圖像傳感器
文件頁(yè)數(shù)： 9/54頁(yè)
文件大?。?/td> 786K
代理商： STV6404E-001
VV5404 & VV6404
CD5404-6404F-A
9/54
4.
Digital Video Interface Format
4.1
The video interface consists of a unidirectional, tri-stateable 4-wire databus. The nibble transmission is synchronised
to the rising edge of the system clock (Figure 13).
General description
Digital video data is 8 bits per sample, transmitted as serial pairs of parallel 4-bit nibbles (most significant nibble first)
on 4 wires.
Multiplexed with the sampled pixel data is control information including both video timing references and sensor
status/configuration data. Video timing reference information takes the form of field start characters, line start
characters, end of line characters and a line counter.
Where hexadecimal values are used, they are indicated by a subscript H, such as FF
H
; other values are decimal.
4.2
To distinguish the control data from the sampled video data all control data is encapsulated in embedded control
sequences. These are a minimum of 6 words long and includes a combined escape/sync character, 1 control word
(the ‘command byte’) and 2 words 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 words 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 frame’ 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 frame’ line).
If the video processor detects one of these violations then it should abandon the current frame of video.
Embedded control data
4.2.1 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 FF
H
FF
H
- constituting two words that are illegal in normal data. The next word is 00
H
-
guaranteeing a clear signal transition that allows a video processor to determine the position of the word boundaries
in the serial stream of nibbles. Combined escape and sync characters are always followed by a command word -
making up the four word minimum embedded control sequence.
4.2.2
The word that follows the combined escape/sync characters defines the type of embedded control data. Three of the
8 bits are used to carry the control information, four are ‘parity bits’ that allow the video processor to detect and correct
a certain level of errors in the transmission of the command words, the remaining bit is always set to 1 to ensure that
the command word is never has the value 00
H
. The coding scheme used allows the correction of single bit errors (in
the 8-bit sequence) and the detection of 2 bit errors. The three data bits of the command word are interpreted as
shown in Figure 5.
The command word
Read-out Order
Progressive Scan (Non-interlaced)
Form of encoding
Uniformly quantised, PCM, 8 bits per sample
Correspondence between video
signal levels and quantisation
levels:
Internally valid pixel data is clipped to ensure that 00
H
and FF
H
values do not occur when pixel data is being output on the data
bus. This gives 254 possible values for each pixel (1 - 254). The
video black level corresponds to code 16.
Table 5 : Video encoding parameters
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