SLDS145B Datasheet, PDF (4/29 Pages) Texas Instruments – TFP410 TI PanelBus DIGITAL TRANSMITTER

TFP410
TI PanelBus™ DIGITAL TRANSMITTER
SLDS145B − OCTOBER 2001 − REVISED MAY 2011
Terminal Functions (Continued)
TERMINAL
NAME
I/O
NO.
CTL3/A3/DK3
6
I
CTL2/A2/DK2
7
CTL1/A1/DK1
8
Configuration/Programming
MSEN/PO1
11
O
ISEL/RST
13
I
BSEL/SCL
15
I
DSEL/SDA
14
I/O
EDGE/HTPLG
9
I
DESCRIPTION
The operation of these three multifunction inputs depends on the settings of the ISEL (pin 13) and
DKEN (pin 35) inputs. All three inputs support 3.3-V CMOS signal levels and contain weak pulldown
resistors so that if left unconnected they default to all low.
When the I²C bus is disabled (ISEL = low) and the de-skew mode is disabled (DKEN = low), these three
inputs become the control inputs, CTL[3:1], which can be used to send additional information across
the DVI link during the blanking interval (DE = low). The CTL3 input is reserved for HDCP compliant DVI
TXs (TFP510) and the CTL[2:1] inputs are reserved for future use.
When the I²C bus is disabled (ISEL = low) and the de-skew mode is enabled (DKEN = high), these
three inputs become the de-skew inputs DK[3:1], used to adjust the setup and hold times of the pixel
data inputs DATA[23:0], relative to the clock input IDCK±.
When the I²C bus is enabled (ISEL = high), these three inputs become the 3 LSBs of the I²C slave
address, A[3:1].
Monitor sense/programmable output 1. The operation of this pin depends on whether the I²C interface
is enabled or disabled. This pin has an open-drain output and is only 3.3-V tolerant. An external 5-kΩ
pullup resistor connected to V_DD is required on this pin.
When I²C is disabled (ISEL = low), a low level indicates a powered on receiver is detected at the
differential outputs. A high level indicates a powered on receiver is not detected. This function is only
valid in dc-coupled systems.
When I²C is enabled (ISEL = high), this output is programmable through the I²C interface (see the I²C
register descriptions section).
I²C interface select/I²C RESET (active low, asynchronous)
If ISEL is high, then the I²C interface is active. Default values for the I²C registers can be found in the
I²C register descriptions section.
If ISEL is low, then I²C is disabled and the chip configuration is specified by the configuration pins
(BSEL, DSEL, EDGE, V_REF) and state pins (PD, DKEN).
If ISEL is brought low and then back high, the I²C state machine is reset. The register values are
changed to their default values and are not preserved from before the reset.
Input bus select/I²C clock input. The operation of this pin depends on whether the I²C interface is
enabled or disabled. This pin is only 3.3-V tolerant.
When I²C is disabled (ISEL = low), a high level selects 24-bit input, single-edge input mode. A low level
selects 12-bit input, dual-edge input mode.
When I²C is enabled (ISEL = high), this pin functions as the I²C clock input (see the I²C register
descriptions section). In this configuration, this pin has an open-drain output that requires an external
5-kΩ pullup resistor connected to V_DD.
DSEL/I²C data. The operation of this pin depends on whether the I²C interface is enabled or disabled.
This pin is only 3.3-V tolerant.
When I²C is disabled (ISEL = low), this pin is used with BSEL and V_REF to select the single-ended or
differential input clock mode (see the universal graphics controller interface modes section).
When I²C is enabled (ISEL = high), this pin functions as the I²C bidirectional data line. In this
configuration, this pin has an open-drain output that requires an external 5-kΩ pullup resistor
connected to V_DD.
Edge select/hot plug input. The operation of this pin depends on whether the I²C interface is enabled or
disabled. This input is 3.3-V tolerant only.
When I²C is disabled (ISEL = low), a high level selects the primary latch to occur on the rising edge of
the input clock IDCK+. A low level selects the primary latch to occur on the falling edge of the input clock
IDCK+. This is the case for both single-ended and differential input clock modes.
When I²C is enabled (ISEL = high), this pin is used to monitor the hot plug detect signal (see the DVI or
VESA™ P&D and DFP standards). When used for hot-plug detection, this pin requires a series 1-KΩ
resistor.
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