PD

PD

DFO, ST, PIXS, STAG,

Rx[2:0]+, Rx[2:0]2,

OCK_INV

50%

50%

TX2

TX1

TX0

DE

SCDT

TFP501

SLDS127C

– JULY 2001 – REVISED JULY 2011

www.ti.com

PARAMETER MEASUREMENT INFORMATION (continued)

Figure 9. Delay from PD Low to High

Figure 10. Minimum Time PD Low

Before Inputs are Active

Figure 11. Analog Input Channel-to-Channel Skew

Figure 12. Time Between DE Transitions to SCDT Low and SCDT High

DETAILED DESCRIPTION

FUNDAMENTAL OPERATION

The TFP501 is a DVI digital receiver that is used in digital display systems to receive and decode TMDS

encoded RGB pixel data streams. High-bandwidth digital content protection (HDCP) receiver functionality

provides decryption of the DVI input data streams encrypted at the transmitter, such as TI's TFP510 HDCP

transmitter, to prevent unauthorized viewing or coping of digital content. In a digital display system a host, usually

a PC or consumer electronics device, contains a DVI compatible transmitter that receives 24-bit pixel data along

with appropriate control signals. The HDCP TFP510 transmitter encrypts and encodes the signals into a

high-speed, low-voltage, differential serial bit stream optimized for transmission over a twisted-pair cable to a

display device. The display device, usually a flat-panel monitor, requires a DVI and HDCP compatible receiver

like the TI TFP501 to decode and decrypt the serial bit stream back to the same 24-bit pixel data and control

signals that originated at the host. This decoded data can then be applied directly to the flat panel drive circuitry

to produce an image on the display. Since the host and display can be separated by distances up to five meters

or more, serial transmission of the pixel data is preferred. To support modern display resolutions up to UXGA, a

high-bandwidth receiver with good jitter and skew tolerance is required.

TMDS PIXEL DATA AND CONTROL SIGNAL ENCODING

TMDS stands for transition minimized differential signaling. Only one of two possible TMDS characters for a

given pixel is transmitted at a given time. The transmitter keeps a running count of the number of ones and zeros

previously sent, transmits the character that minimizes the number of transitions, and approximates a dc balance

of the transmission line.

10

Copyright

© 2001–2011, Texas Instruments Incorporated