Read data from camera

VV5430

CD5430F-A

22/33

9.

Read data from camera

Information describing the current configuration and the current exposure values can be read from the camera. The data is

formed into four bytes of 8 bits. Each pair of bytes is considered to be a data word and is read out msb first.

Figure 9 : Read Data Format

The following tables defines the information contained in the read messages. By default, the Primary Read Data is accessed;

only if a Secondary Read Select bit is set in Setup Code_2 (header code 0010) is the Secondary information read.

S

W

AA

A

A

A

P

ADDRESS[7:1]

DATA[31:24]

DATA[23:16]

DATA[15:8]

DATA[7:0]

Read = 1

Camera acknowledge (valid address)

Master acknowledge

Master acknowledge

0 0 1 0 0 x x 1

Primary Read Data:

Bit

Function

31 - 23

Coarse Exposure Value (9 bits)

22 - 14

Fine Exposure Value (9 bits)

13 - 10

Gain Value (4 bits)

9

Auto Exposure Control on/off

8

Internal Black Calibration on/off

7

Auto Gain Control on/off

6

Gamma or Linear Video Output

5

4

Undefined

3 - 0

Camera Type ID Code (4 bits)

1. Bit 5 of the Primary Read message only reflects the state

of the BKLIT pin, not the combined result of the pin and

the serial interface BKLIT control bit.

Secondary Read Data:

Bit

Function

31 - 18

Undefined

17

Black Level monitor in progress

16 - 0

White Pixel count (17 bits)