Datasheet

AD9920A
Rev. B | Page 67 of 112
RapidShot Sequences
RapidShot technology provides continuous repetition of
scheduled toggles.
Preparation
The GP toggle positions can be programmed any time prior to
use. For example,
0x71 ← 0x0004000
0x7C ← 0x000A001
0x7D ← 0x0002000
0x7E ← 0x000000F
0x7F ← 0x00C4002
0x80 ← 0x0004000
0x81 ← 0x00000B3
0x73 ← 0x0000006
Details
A) Field 0: 0x70 ← 0x0000010
B) Field 2: 0x70 ← 0x0000007
VD
12345
REGISTER WRITE
AB
GP1_PROTOCOL
06
0 (IDLE)121210
GPO1
TERMINATED
AT VD EDGE
CAUTION! THE FIELD COUNTER MUST BE FORCED INTO IDLE
STATE TO TERMINATE REPETITIONS.
SECONDARY
COUNT
06878-086
Figure 86. RapidShot Toggle Operation Using GP_PROTOCOL = 6
ShotTimer Sequences
ShotTimer technology provides internal delay of scheduled
toggles. The delay is in terms of fields.
Preparation
The GP toggle positions can be programmed any time prior to
use. For example,
0x71 ← 0x0004000
0x72 ← 0x000C000
0x7C ← 0x000A001
0x7D ← 0x0002000
0x7E ← 0x000000F
0x73 ← 0x0000006
Details
A) Field 0: 0x70 ← 0x0000018
VD 1
2
REGISTER WRITE
A
GP1_PROTOCOL
06
0 (IDLE) 1 2 3 1 2 0
GPO1
SECONDARY
COUNT
06878-087
Figure 87. ShotTimer Toggle Operation Using GP_PROTOCOL = 6