AD9927BBCZ datasheet(61/100 Pages) AD

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AD9927

Rev. 0 | Page 61 of 100

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

0x000A001

0x7B

0x0002000

0x7C

0x000000F

0x7D

0x00C4002

0x7E

0x0004000

0x7F

0x00000B3

Details

A) Field 0:

0x70

0x0000040

0x73

0x0000001

B) Field 1:

0x73

0x0000000

GP1_PROTOCOL 0

GPO1

NOTES

1. THE FIELD TOGGLE POSITION MUST BE SET TO 1 WHEN

GP PROTOCOL IS 1.

CAUTION! THE GP_PROTOCOL MUST BE RESET BEFORE

USING AGAIN.

Figure 72. Single-Field Toggles Using GP_PROTOCOL = 1

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

0x00C4002

0x7B

0x0004000

0x7C

0x00000B3

Details

A) Field 0:

0x70

0x0000008

0x73

0x0000003

GP1_PROTOCOL 0

SECONDARY

COUNT

GPO1

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.

(IDLE)

Figure 73. Scheduled Toggles Using GP_PROTOCOL = 3

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