AD9920ABBCZ datasheet(50/112 Pages) AD

50 / 112 page

AD9920A

Rev. B | Page 50 of 112

FIELD3

FIELD1

FIELD2

FIELD3

FIELD5

FIELD1

FIELD4

FIELD2

EXAMPLE 1:

TOTAL FIELDS = 3, FIRST FIELD = FIELD1, SECOND FIELD = FIELD2, THIRD FIELD = FIELD3

MODE SETTINGS:

0x2A = 0x03

0x2B = 0x820

0x2C = 0x00

EXAMPLE 2:

TOTAL FIELDS = 1, FIRST FIELD = FIELD3

MODE SETTINGS:

0x2A = 0x01

0x2B = 0x03

0x2C = 0x00

EXAMPLE 3:

TOTAL FIELDS = 4, FIRST FIELD = FIELD5, SECOND FIELD = FIELD1, THIRD FIELD = FIELD4, FOURTH FIELD = FIELD2

MODE SETTINGS:

0x2A = 0x04

0x2B = 0x11025

0x2C = 0x00

Figure 61. Using the Mode Registers to Select Field Timing

MODE FIELD NUMBER

4 (DRAFT)

0 (STILL FIRST FIELD)

EXAMPLE MODE REGISTER CHANGE:

CHANGE FROM DRAFT MODE (FIELD4) TO STILL MODE (FIELD1/2/3).

ALSO WRITE TO VGA GAIN OR ANY NEW REGISTER VALUES NEEDED

FOR STILL FRAME OPERATION, SUCH AS NEW FIELD INFORMATION.

1 (STILL SECOND FIELD)

MODE UPDATE

MODE WRITE

Figure 62. Update of Mode Register, SCK Updated (Default Setting)

MODE FIELD NUMBER

4 (DRAFT)

EXAMPLE MODE REGISTER CHANGE:

CHANGE FROM DRAFT MODE (FIELD4) TO STILL MODE (FIELD1/2/3).

FOR STILL FRAME OPERATION, SUCH AS NEW FIELD INFORMATION.

NOTES

1. NEW MODE INFORMATION IS UPDATED AT SECOND VD FALLING EDGE AFTER

SERIAL WRITE A.

MODE UPDATE

MODE WRITE

0 (STILL FIRST FIELD)

1 (STILL SECOND FIELD)

Figure 63. Update of Mode Register, VD Updated

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