AD9992BBCZ datasheet(51/92 Pages) AD

51 / 92 page

AD9992

Rev. C | Page 51 of 92

GENERAL-PURPOSE OUTPUTS (GPOS)

The AD9992 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 23.

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 registers

(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 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

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 AD9992.

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.

AD9992BBCZ датащи(PDF) 51 Page - Analog Devices

AD9992BBCZ датащи(HTML) 51 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92

датащи скачать

ссылки URL