TFP410MPAPREP datasheet(15/31 Pages) TI1

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TFP410-EP

PanelBus

™ DIGITAL TRANSMITTER

SGLS344A − JULY 2006 − REVISED MAY 2011

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

data deskew feature

The deskew feature allows adjustment of the input setup/hold time. Specifically, the input data DATA[23:0] can

be latched slightly before or after the latching edge of the clock IDCK± depending on the amount of deskew

desired. When deskew enable (DKEN) is enabled, the amount of deskew is programmable by setting the three

bits DK[3:1]. When disabled, a default deskew setting is used. To allow maximum flexibility and ease of use,

DKEN and DK[3:1] are accessed directly through configuration pins when I2C is disabled, or through registers

of the same name when I2C is enabled. When using I2C mode, DKEN should be tied to ground to avoid a floating

input.

The input setup/hold time can be varied with respect to the input clock by an amount t(CD) given by the formula:

t(CD) = (DK[3:1] – 4) × t(STEP)

Where:

t(STEP) = Adjustment increment amount

DK[3:1] = Number from 0 to 7 represented as a 3-bit binary number

t(CD) = Cumulative deskew amount

(DK[3:1] – 4) is simply a multiplier in the range {–4, –3, –2, –1, 0, 1, 2, 3} for t(STEP). Therefore, data can be

latched in increments from four times the value of t(STEP) before the latching edge of the clock to three times

the value of t(STEP) after the latching edge. Note that the input clock is not changed, only the time when data

is latched with respect to the clock.

−t(CD)

000

−4 × t(STEP)

100

Default Falling

111

3 × t(STEP)

000

−4 × t(STEP)

100

Default Rising

111

3 × t(STEP)

DATA[23:0]

IDCK±

DK[3:1]

t(CD)

−t(CD)

t(CD)

Figure 8. A Graphical Representation of the De-Skew Function

hot plug/unplug (auto connect/disconnect detection)

The TFP410 supports hot plug/unplug (auto connect/disconnect detection) for the DVI link. The receiver sense

(RSEN) input bit indicates if a DVI receiver is connected to TXC+ and TXC–. The HTPLG bit reflects the current

state of the HTPLG pin connected to the monitor via the DVI connector. When I2C is disabled (ISEL = 0), the

RSEN value is available on the MSEN pin. When I2C is enabled, the connection status of the DVI link and

HTPLG sense pins are provided by the CTL_2_MODE register. The MSEL bits of the CTL_2_MODE register

can be used to program the MSEN to output the HTPLG value, the RSEN value, an interrupt, or be disabled.

The source of the interrupt event is selected by TSEL in the CTL_2_MODE register. An interrupt is generated

by a change in status of the selected signal. The interrupt status is indicated in the MDI bit of CTL_2_MODE

and can be output via the MSEN pin. The interrupt continues to be asserted until a 1 is written to the MDI bit,

resetting the bit back to 0. Writing 0 to the MDI bit has no effect.

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