HSYNC Shift by

± 1 Clock

ODCK

HSYNC IN

DE

HSYNC OUT

15

TFP401, TFP401A

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SLDS120G – MARCH 2000 – REVISED MAY 2016

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Figure 17. HSYNC Regeneration Timing Diagram

9.4 Device Functional Modes

9.4.1 TFP401/401A Modes of Operation

The TFP401/401A provides system design flexibility and value by providing the system designer with

configurable options or modes of operation to support varying system architectures. Table 2 outlines the various

panel modes that can be supported, along with appropriate external control pin settings.

Table 2. TFP401/401A Modes of Operation

PANEL

PIXEL RATE

ODCK LATCH EDGE

ODCK

DFO

PIXS

OCK_INV

TFT or 16-bit DSTN

1 pix/clock

Falling

Free run

0

0

0

TFT or 16-bit DSTN

1 pix/clock

Rising

Free run

0

0

1

TFT

2 pix/clock

Falling

Free run

0

1

0

TFT

2 pix/clock

Rising

Free run

0

1

1

24-bit DSTN

1 pix/clock

Falling

Gated low

1

0

0

NONE

1 pix/clock

Rising

Gated low

1

0

1

24-bit DSTN

2 pix/clock

Falling

Gated low

1

1

0

24-bit DSTN

2 pix/clock

Rising

Gated low

1

1

1

9.4.2 TFP401/401A Output Driver Configurations

The TFP401/401A provides flexibility by offering various output driver features that can be used to optimize

power consumption, ground bounce, and power-supply noise. The following sections outline the output driver

features and their effects.

9.4.2.1 Output Driver Power Down

(PDO = low). Pulling PDO low places all the output drivers, except CTL1 and SCDT, into a high-impedance state.

The SCDT output, which indicates link-disabled or link-inactive, can be tied directly to the PDO input to disable

the output drivers when the link is inactive or when the cable is disconnected. An internal pullup on the PDO pin

defaults the TFP401/401A to the normal nonpower-down output drive mode if left unconnected.

9.4.2.2 Drive Strength

(ST = high for high drive strength, ST = low for low drive strength). The TFP401/401A allows for selectable

output drive strength on the data, control, and ODCK outputs. See the DC Electrical Characteristics table for the

times the drive as the low-output drive strength.