2.5 HPD Snoop Option
To accommodate systems that do not properly resend DDC commands after HPD goes low, we have
implemented an HPD snoop mode on the TDP0604 EVM. This mode allows the HPD line to be routed around
the TDP0604, but remain connected to the TDP0604 on the sink side to allow the TDP0604 to snoop its state.
• Populate R131, no populate R129 for HPD on.
• No populate R131, populate R129 for HPD snoop-only
2.6 Local I2C Access
Access to TDP0604s local I2C signals is provided via the J5 connector. The TDP0604 supports either 1.2 V,
1.8 V and 3.3 V LVCMOS levels. The TDP0604 VIO pin is used to select which voltage level is used for the
following 2-level control pins: LV_DDC_SDA, LV_DDC_SCL, SCL/CFG0, and SDA/CFG1. It is important that the
I2C signalling levels meet the TDP0604 LVCMOS levels when I2C interface is accessed through the connector.
A standalone external I2C host can be connected via J5 for debug and control purposes. An example of an
external I2C Host controller is the Total Phase Aardvark I2C/SPI Host Adapter (Total Phase Part#: TP240141).
Sample scripts for this I2C host controller are provided by request.
The target I2C address for the TDP0604 can be modified by the EVM jumper JMP8. Please refer to the
TDP0604 ADR/EQ pin setting and its corresponding I2C address. Refer to TDP0604 data sheet for the 7-bit I2C
slave address options.
Table 2-4. Aardvark I2C (J5) Pinout
J5 pin #
Description
J5 pin #
Description
1
SCL_CTL
2
GND
3
SDA_CTL
4
NC
5
NC
6
NC
7
NC
8
NC
9
NC
10
GND
3 Quick Start Guide
The instructions below assume the EVM is configured for pin-strap mode and is powered from barrel jack.
1. Ins5 V DC Power source into barrel jack. Turn on SW2.
2. If using external I2C configuration instead of pin-straps, please configure TDP0604 at this step.
3. Insert a HDMI source using a standard HDMI cable into P1 (HDMI receptacle).
4. Insert a HDMI video sink into P2 (HDMI receptacle) using a standard HDMI cable.
5. Video output on HDMI sink should be observed.
Hardware Configuration
TDP0604 EVM User's Guide
5
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