VV5404 datasheet(13/54 Pages) STMICROELECTRONICS

13 / 54 page

VV5404 & VV6404

CD5404-6404F-A

13/54

The even parity bits are based on the following relationships:

1. An even number of ones in the 4-bit sequence (C2, C1, C0 and P0).

2. An even number of ones in the 3-bit sequence (C2, C1, P1).

3. An even number of ones in the 3-bit sequence (C2, C0, P2).

4. An even number of ones in the 3-bit sequence (C1, C0, P3).

Table 6 shows how the parity bits maybe used to detect and correct 1-bit errors and detect 2-bit errors.

4.2.3

Supplementary Data

The last 2 bytes of the embedded control sequence contains supplementary data. This normally contains the current

line number except if the line code is the end of line, the 2 bytes are padded out using null characters (FFH). The 12

bit line number is packaged up by splitting it into two 6-bit values. Each 6-bit values is then converted into an 8-bit

value by adding a zero to the start and an odd word parity bit at the end.

4.3

Video timing reference and status/configuration data

The video sequence is made up of lines of data. Each field of data is constructed of the following data lines:

1. A start of frame line

2. 2 of ‘black lines’ (used for black level calibration)

3. 7 (9) of blank lines

4. 292 (288) active video lines

5. An end of frame line

6. 1 (3) blank lines

The numbers given in () are for when the border rows and columns are not output on the databus.

Each line of data starts with an embedded control sequence that identifies the line type (as outlined in Table 3). The

control sequence is then followed by two bytes that, except in the case of the end-of-frame line, contain a coded line

number. The line number sequences starts with the start-of-frame line at 00H and increments one per line up until the

end-of-frame line. Each line is terminated with an end-of-line embedded control sequence. The line start embedded

sequences must be used to recognise data lines as a number of null bytes may be inserted between data lines.

Parity Checks

Comment

Code word un-corrupted

P0 corrupted, line code OK

P1 corrupted, line code OK

P2 corrupted, line code OK

P3 corrupted, line code OK

C0 corrupted, invert sense of C0

C1 corrupted, invert sense of C1

C2 corrupted, invert sense of C2

All other codes

2-bit error in code word.

Table 6 : Detection of 1-bit and 2-bit errors in the Command Word

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