AD9927BBCZ datasheet(59/100 Pages) AD

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AD9927

Rev. 0 | Page 59 of 100

GENERAL-PURPOSE OUTPUTS (GPOS)

The AD9927 provides programmable outputs to control a

mechanical shutter, strobe/flash, the CCD bias select signal, or

any other external component with general-purpose (GP)

signals. Eight GP signals, with up to four toggles each, are

available that can be programmed and assigned to special GPO

pins. These pins are bidirectional and allow visibility (as an

output) and external control (as an input) of HBLK, PBLK,

CLPOB, and OUTCONTROL. The registers introduced in this

section are described in Table 42.

GP Toggles

When configured as an output, each GPO1 to GPO8 output can

deliver a signal that is the result of programmable toggle

positions. The GP signals are independent and can be linked to

either a specific VD period or over a range of VD periods via

the primary or secondary field counters through the GP

protocol register (Address 0x73). As a result of their

associations with the field counters, the GP toggles inherit the

characteristics of the field counters, such as RapidShot and

ShotDelay. To use the GP toggles

Program the toggle positions (Address 0x7A to

Address 0xA9).

Program the protocol (Address 0x73).

Program the counter parameters (Address 0x71 to

Address 0x72).

Activate the counter (Address 0x70).

For Protocol 1 (no counter association), skip Steps 3 and 4.

With these four steps, the GP signals can be programmed to

accomplish many common tasks. Careful protocol selection and

application of the field counters yields efficient results to allow

the GP signals smooth integration with concurrent operations.

Note that the SUBCK and VSG masks are linked to the primary

counter; however, if their parameters are 0, the GPO can use the

primary counter without expose/read activity.

The secondary counter is independent and can be used

simultaneously with the primary counter. Some applications

may require the use of both primary and secondary field

counters with different GPO protocols, start times, and

durations. Such operations are easily handled by the AD9927.

Several simple examples of GPO applications using only one

GPO and one field counter follow. These examples can be used

as building blocks for more complex GPO activity. In addition,

specific GPO signals can be passed through a 4-input LUT to

realize combinational logic between them. For example, GP1

and GP2 can be sent through an XOR look-up table, and the

result can be delivered on GP1, GP2, or both. Also, either GP1

or GP2 can deliver their original toggles.

Table 42. 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.

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