DS90CF384 LVDS to Parallel Bit Mapping?

Hi Leo,

That is correct. Each of the LVDS pairs contains 7 bits of information corresponding to each individual LVCMOS bit.To look at how the LVDS channels map to the Tx and Rx outputs, please look at Figure 14 on the DS90CF384 datasheet (there is a typo in the labeling. It should say "28 Parallel TTL Data Inputs Mapped to LVDS Outputs":

Therefore, in the Rx, each bit's information will be mapped from the corresponding LVDS position. For example, RxOUT5 information will be taken from the 2nd bit in the TxOUT3+/-'s sequence.

To convert this over in terms of RGB bit information, please refer to the following app note:

http://www.ti.com/lit/an/snla014/snla014.pdf

Table 1 of the app note shows that typically in design, the Tx/Rx mapping follows the standard convention of LSBs placed on TxOUT3+/- LVDS pair, as this allows convenience to use 24-bit or 18-bit color resolution. Ultimately, what matters is the way you map your outputs in accordance to the way they will arrive per Figure 14 (above).

Thanks,

Michael

Hello Leo,

We have tested the DS90CF386 on our Eval Board for the current at each of these pins individually by desoldering the resistors that connect each of these pins to the power supply and measuring the current across the original resistor pads with an ammeter. The device was tested with a 65 MHz clock and a 16.2 MHz signal.

The current into each of the pins was as follows:

As the DS90CF386 is similar to the DS90CF384, we correlate the relationship of their respective total currents to derive approximately what we expect for the three individual VCC pins of the DS90CF384.

Best,

Michael

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