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AD9992

Rev. C | Page 52 of 92

Table 23. GPO Registers

Length

Range

Description

GP1_PROTOCOL

0 to 7

0: Idle.

GP2_PROTOCOL

0 to 7

1: No counter association, use MANUAL_TRIG bits to enable each GP signal.

GP3_PROTOCOL

0 to 7

2: Link to primary counter.

GP4_PROTOCOL

0 to 7

3: Link to secondary counter.

GP5_PROTOCOL

0 to 7

4: Link to mode counter (from vertical timing generation).

GP6_PROTOCOL

0 to 7

5: Primary repeat (allows GP signals to repeat with RapidShot).

GP7_PROTOCOL

0 to 7

6: Secondary repeat (allows GP signals to repeat with RapidShot).

GP8_PROTOCOL

0 to 7

7: Keep on.

MANUAL_TRIG

Off/on

Manual trigger for each GP signal, for use with Protocol 1.

GP<1:8>_POL

Low/high

Starting polarity for GP signals, only updated during PROTOCOL = 0.

SEL_GP<1:8>

Off/on

1: Select GP toggles visible at GPO1 to GPO8 when output is enabled (default);

0: Select vertical signals visible at GPO4 to GPO8 when output is enabled.

GPO4: SUBCK.

GPO5: XV21.

GPO6: XV22.

GPO7: XV23.

GPO8: XV24.

GPO_OUTPUT_EN

Off/on

1: Enable GPO1 to GPO8 outputs (one bit per output).

0: Disable GPO1 to GPO8 outputs, pins will be high-Z state (default).

GP*_USE_LUT

Off/on

Send GP signals through a programmable look-up table (LUT).

LUT_FOR_GP12

Logic setting

Desired logic to be realized on GP1 combined with GP2.

LUT_FOR_GP34

Logic setting

Desired logic to be realized on GP3 combined with GP4.

LUT_FOR_GP56

Logic setting

Desired logic to be realized on GP5 combined with GP6.

LUT_FOR_GP78

Logic setting

Desired logic to be realized on GP7 combined with GP8.

Example logic settings for LUT_FOR_GPxy:

0x6: GPy XOR GPx (see Figure 64).

0x7: GPy NAND GPx.

0x8: GPy AND GPx.

0xE: GPy OR GPx.

GP*_TOG*_FD

13b

0 to 8191 field

Field of activity, relative to primary and secondary counter for corresponding toggle.

GP*_TOG*_LN

13b

0 to 8191 line

Line of activity for corresponding toggle.

GP*_TOG*_PX

13b

0 to 8191 pixel

Pixel of activity for corresponding toggle.

GPO_INT_EN

Off/on

When set to 1, internal signals are viewable on GPO5 to GPO8.

GPO5: OUTCONTROL.

GPO6: HBLK.

GPO7: CLPOB.

GPO8: PBLK.

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