AD9927 Analog Devices, AD9927 Datasheet - Page 61

• Manufacturer Part Number: AD9927
• Description: 14-Bit CCD Signal Processor
• Manufacturer: Analog Devices

Single-Field Toggles
Single-field toggles occur in the next field only. There can be up to
four toggles in the field. The mode is set with GP_PROTOCOL
equal to 1, and then the toggles are triggered in the next field by
writing to the MANUAL_TRIG register (0x70 [13:6]). In this
mode, the field toggle settings must be set to a value of 1. Two
consecutive fields do not have activity. If toggles are required to
repeat in the next field, the MANUAL_TRIG register can be
written to in consecutive fields.
Preparation
The GP toggle positions can be programmed any time prior to
use. For example,
0x7A
0x7B
0x7C
0x7D
0x7E
0x7F
Details
A) Field 0:
B) Field 1:
REGISTER WRITE
GP1_PROTOCOL 0
GPO1
Figure 72. Single-Field Toggles Using GP_PROTOCOL = 1
NOTES
1. THE FIELD TOGGLE POSITION MUST BE SET TO 1 WHEN
CAUTION! THE GP_PROTOCOL MUST BE RESET BEFORE
USING AGAIN.
VD
0x000A001
0x0002000
0x000000F
0x00C4002
0x0004000
0x00000B3
GP PROTOCOL IS 1.
0x70
0x73
0x73
A
1
0x0000040
0x0000001
0x0000000
B
1
0
Rev. 0 | Page 61 of 100
Scheduled Toggles
Scheduled toggles are programmed to occur during any
upcoming field. For example, there can be one toggle in Field 1,
two toggles in Field 3, and a last toggle in Field 4. The mode is
set with GP_PROTOCOL = 2 or GP_PROTOCOL = 3. Mode 2
tells the GPO to obey the primary field counter, and Mode 3
tells the GPO to obey the secondary field counter.
Preparation
The GP toggle positions can be programmed any time prior to
use. For example,
0x7A
0x7B
0x7C
Details
A) Field 0:
REGISTER WRITE
GP1_PROTOCOL 0
SECONDARY
COUNT
GPO1
Figure 73. Scheduled Toggles Using GP_PROTOCOL = 3
VD
CAUTION! THE PRIMARY COUNTER REGULATES THE SUBCK
AND VSG ACTIVITY. LINK A GPO TO THE PRIMARY COUNTER
ONLY IF IT IS TO HAPPEN DURING EXPOSURE/READ.
0x00C4002
0x0004000
0x00000B3
0
(IDLE)
0x70
0x73
A
3
1
0x0000008
0x0000003
1
2
2
AD9927
0