AD9920ABBCZ datasheet(64/112 Pages) AD

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AD9920A

Rev. B | Page 64 of 112

GENERAL-PURPOSE OUTPUTS (GPOs)

The AD9920A provides programmable outputs to control a

mechanical shutter, the 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 to 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

OUT_CONTROL. The GPO registers are described in Table 45.

Note that GPO5 and GPO6 are used to control the SG signals

for the V5 and V6 outputs of the AD9920A. See the SG Control

Using GPO section for more information.

GP Toggles

When configured as an output, each GPO output can deliver a

signal that is the result of programmable toggle positions. The

GP signals are independent and can be linked to a specific VD

period or to 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 ShotTimer.

To program the GP toggles, complete the following steps:

Program the toggle positions (Address 0x7C to

Address 0xAB).

Program the GP protocol (Address 0x73).

Program the counter parameters (Address 0x71 to

Address 0x72).

Activate the counter (Address 0x70).

For Protocol 1 (no counter association), skip Step 3 and Step 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 simul-

taneously 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 AD9920A.

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 four-input lookup

table (LUT) to realize combinational logic between them. For

example, GP1 and GP2 can be sent through an XOR lookup

table, and the result can be delivered on GP1, GP2, or both. In

addition, GP1 or GP2 can deliver its original toggles.

Table 45. GPO Registers

Length (Bits)

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 = test only.

GP4_PROTOCOL

0 to 7

3 = test only.

GP5_PROTOCOL

0 to 7

4 = link to mode counter (from vertical timing generation).

GP6_PROTOCOL

0 to 7

5 = link to primary counter (also allows GP signals to repeat with RapidShot).

GP7_PROTOCOL

0 to 7

6 = link to secondary counter (also allows GP signals to repeat with RapidShot).

GP8_PROTOCOL

0 to 7

7 = keep on.

MANUAL_TRIG

On/off

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

GP[1:8]_POL

Low/high

Starting polarity for GP signals. Only updated when GPx_PROTOCOL = 0.

SEL_GP[1:8]

On/off

1 = select GP toggles visible at GPO1 to GPO4, GPO7, and GPO8 when output is

enabled (default).

0 = select vertical signals visible at GPO4 to GPO8 when output is enabled.

GPO4: XSUBCK.

GPO5: XV21.

GPO6: XV22.

GPO7: XV23.

GPO8: XV24.

GPO_OUTPUT_EN

On/off

1 = enable GPO1 to GPO4, GPO7, and GPO8 outputs (one bit per output).

0 = disable GPO1 to GPO4, GPO7, and GPO8 outputs; pins are high-Z (default).

GPx_USE_LUT

On/off

Send GP signals through a programmable lookup table (LUT).

LUT_FOR_GP12

Logic setting

Desired logic to be realized on GPO1 combined with GPO2.

LUT_FOR_GP34

Logic setting

Desired logic to be realized on GPO3 combined with GPO4.

LUT_FOR_GP56

Logic setting

Desired logic to be realized on GPO5 combined with GPO6.

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