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参数资料
| 型号： | TFP403PZP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封装： | 14 X 14 MM, 1 MM HEIGHT, 0.50 MM PITCH, GREEN, PLASTIC, HTQFP-100 |
| 文件页数： | 3/20页 |
| 文件大小： | 496K |
| 代理商： | TFP403PZP |
TFP403
TI PanelBus DIGITAL RECEIVER
SLDS125A DECEMBER 2000 REVISED OCTOBER 2002
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description
fundamental operation
The TFP403 is a digital visual interface (DVI) compliant TMDS digital receiver that is used in digital flat panel
display systems to receive and decode TMDS encoded RGB pixel data streams. In a digital display system a
host, usually a PC or workstation, contains a DVI compatible transmitter that receives 24 bit pixel data along
with appropriate control signals. The transmitter encodes them 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, will require a DVI compatible receiver like the TI TFP403 to decode 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 5 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 will be transmitted at a given time. The transmitter keeps a running count of the number of ones and
zeros previously sent and transmits the character that will minimize the number of transitions and approximate
a dc balance of the transmission line.
Three TMDS channels are used to receive RGB pixel data during active display time, DE = high. The same three
channels also receive control signals, HSYNC, VSYNC, and user defined control signals CTL[2:1]. These
control signals are received during inactive display or blanking-time. Blanking-time is when DE = low. The
following table maps the received input data to appropriate TMDS input channel in a DVI compliant system.
RECEIVED PIXEL DATA
ACTIVE DISPLAY DE = HIGH
INPUT CHANNEL
OUTPUT PINS
(VALID FOR DE = HIGH)
Red[7:0]
Channel – 2 (Rx2
±)
QE[23:16] QO[23:16]
Green[7:0]
Channel – 1 (Rx1
±)
QE[15:8] QO[15:8]
Blue[7:0]
Channel – 0 (Rx0
±)
QE[7:0] QO[7:0]
RECEIVED CONTROL DATA
BLANKING DE = LOW
INPUT CHANNEL
OUTPUT PINS
(VALID FOR DE = LOW)
CTL[3:2] (see Note 7)
Channel – 2 (Rx2
±)
CTL2
CTL[1: 0] (see Note 7)
Channel – 1 (Rx1
±)
CTL1
HSYNC, VSYNC
Channel – 0 (Rx0
±)
HSYNC, VSYNC
NOTE 7: Some TMDS transmitters transmit a CTL0 signal. The TFP403 decodes and
transfers CTL[2:1] and ignores CTL0 characters. CTL3 is used internally to enable
HDCP decryption. CTL3 and CTL0 are not available as TFP501 outputs.
The TFP403 discriminates between valid pixel TMDS characters and control TMDS characters to determine
the state of active display versus blanking, i.e., state of DE.
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