Datasheet

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
0
6878-062
Figure 61. Using the Mode Registers to Select Field Timing
VD
REGISTER WRITE
A
MODE FIELD NUMBER 4 (DRAFT) 4 (DRAFT) 0
(STILL FIRST FIELD)
EXAMPLE MODE REGISTER CHANGE:
REGISTER WRITE A––WRITE TO MODE REGISTERS 0x2A, 0x2B, 0x2C TO SPECIFY
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)
2
MODE UPDATEMODE WRITE
0
6878-060
Figure 62. Update of Mode Register, SCK Updated (Default Setting)
VD
REGISTER WRITE
AB
MODE FIELD NUMBER 4 (DRAFT) 4 (DRAFT)
EXAMPLE MODE REGISTER CHANGE:
REGISTER WRITE A––WRITE TO MODE REGISTERS 0x2A, 0x2B, 0x2C TO SPECIFY
CHANGE FROM DRAFT MODE (FIELD4) TO STILL MODE (FIELD1/2/3).
REGISTER WRITE B––WRITE TO VGA GAIN OR ANY NEW REGISTER VALUES NEEDED
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.
2
MODE UPDATE
MODE WRITE
06878-061
0 (STILL FIRST FIELD) 1 (STILL SECOND FIELD)
Figure 63. Update of Mode Register, VD Updated