FPD85308 datasheet(28/31 Pages) NSC

номер детали	FPD85308

подробное описание детали	Panel Timing Controller

PDF	31 Pages

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производитель	NSC [National Semiconductor (TI)]

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APPENDIX A: GPO Programming

Examples (Continued)

GPO Programming Example #2:

Generate a control signal which transitions low 20 output

clocks after the beginning of each output line, has a pulse-

width (low) of 12 µs, and goes high during horizontal blank-

ing. This control signal is used as an output enable for the

gate drivers.

Horizontal time (clocks/line) = 1300 dot clocks

Vertical period (lines/frame) = 850 lines

Control is active beginning at line 2 and remains active for

768 lines.

GPO Vertical Start Register = 2

GPO Vertical Duration Register = 768d (300h)

Negative pulse goes low each line at output clock 20 corre-

sponding to when the 39/40 pixels are output on OR, OG,

OB, ER, EG, EB. Pulse remains low for 390 output clocks

(390 x 30.8 ns/clock = 12 µs). (Dual Bus output clock =

32.5 MHz for 65 MHz XGA video, 1024 pixels/line, 768

lines/frame).

Note: 6 counts are added to the output clock # because the GPO start count

begins 6 clocks prior to the output data.

GPO Horizontal Start Register = 26d (1ah)

GPO Horizontal Duration Register = 390d (186h)

The control pulses are negative (bit [0] = 1) and the toggle

circuitry is disabled (bit1 [1] = 0).

GPO Control Register = 1

DS101356-24

FPD85308 датащи(PDF) 28 Page - National Semiconductor (TI)