ITE IT66121FN

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IT66121FN
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Low Power Transmitter with HDMI1.4 3D
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Datasheet
ITE TECH. INC.
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Specification V1.02
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IT66121FN
General Description
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The IT66121 is a high-performance and low-power single channel HDMI transmitter, fully compliant
with HDMI 1.3a, HDCP 1.2 and backward compatible to DVI 1.0 specifications. IT66121 also provide
the HDMI1.4 3D feature, which enables direct 3D displays through an HDMI link. The IT66121 serves
to provide the most cost-effective HDMI solution for DTV-ready consumer electronics such as set-top
boxes, DVD players and A/V receivers, as well as DTV-enriched PC products such as notebooks and
desktops, without compromising the performance. Its backward compatibility to DVI standard allows
connectivity to myriad video displays such as LCD and CRT monitors, in addition to the
ever-so-flourishing Flat Panel TVs.
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Aside from the various video output formats supported, the IT66121 also supports 8 channels of I2S
digital audio, with sampling rate up to 192kHz and sample size up to 24 bits. IT66121 also support
S/PDIF input of up to 192kHz sampling rate.
The newly supported High-Bit Rate (HBR) audio by HDMI Specifications v1.3 is provided by the
IT66121 in two interfaces: with the four I2S input ports or the S/PDIF input port. With both interfaces
the highest possible HBR frame rate is supported at up to 768kHz
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and maintenance of the HDCP keys.
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By default the IT66121 comes with integrated HDCP ROMs which are pre-programmed with HDCP
keys that ensures secure digital content transmission. Users need not worry about the procurement
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The IT66121 also provides a complete solution of Consumer Electronics Control (CEC) function. This
optional CEC feature of HDMI specification allows the user to control two or more CEC-enabled
devices through HDMI network. With IT66121 embedded CEC PHY, user can use high-level software
API to easily implement all the necessary remote control commands. The CEC bus related protocol is
handled by the CEC PHY which eliminates extra loading of the MCU.
 Single channel HDMI transmitter
 Compliant with HDMI 1.3a, HDCP 1.2 and DVI 1.0 specifications
 Supporting pixel rates from 25MHz to 165MHz
 DTV resolutions: 480i, 576i, 480p, 576p, 720p, 1080i up to 1080p
 PC resolutions: VGA, SVGA, XGA, SXGA up to UXGA
 Various video input interface supporting digital video standards such as:
 24-bit RGB/YCbCr 4:4:4 with RB swap option
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IT66121FN
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 16/20/24-bit YCbCr 4:2:2 with YC swap option
 8/10/12-bit YCbCr 4:2:2 (CCIR-656)
 BTA-T1004 format
 DE-only interface
 DDR option
 Support HDMI1.4 3D feature
 Frame packing mode up to [email protected]/24Hz and [email protected]/60Hz
 Top and Bottom up to [email protected]/60Hz
 Side-by-Side (Half) up to [email protected]/60Hz
 Side-by-Side (Full) up to [email protected]/60Hz
 Bi-direction Color Space Conversion (CSC) between RGB and YCbCr color spaces with
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programmable coefficients.
 Digital audio input interface supporting
 audio sample rate: 32~192 kHz
 sample size: 16~24 bits
 four I2S interfaces supporting 8-channel audio
 S/PDIF interface supporting PCM, Dolby Digital, DTS digital audio transmission at up to
192kHz
 Support for high-bit-rate (HBR) audio such as DTS-HD and Dolby TrueHD through the four I2S
interface or the S/PDIF interface, with frame rates as high as 768kHz
 Compatible with IEC 60958 and IEC 61937
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 Software programmable HDMI output current, enabling user to optimize the performance for
fixed-cable systems or those with pre-defined cable length
 MCLK input is optional for audio operation. Users could opt to implement audio input interface with
or without MCLK.
 Integrated pre-programmed HDCP keys
 Purely hardware HDCP engine increasing the robustness and security of HDCP operation
 Monitor detection through Hot Plug Detection and Receiver Termination Detection
 Embedded full-function pattern generator
 Intelligent, programmable power management
 Embedded hardware controlled CEC PHY
 Ultra low power consumption, operation power is less than 70mw at 1080p@60Hz format.
 64-pin (9x9 mm) QFN package
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IT66121FN
Ordering Information
Temperature Range
Package Type
Green/Pb free Option
IT66121FN
-20~75
64-pin QFN
Green
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Model
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IT66121FN
ENTEST
TX2P
TX2M
DVDD12
TX1P
TX1M
TX0P
TX0M
AVCC12
TXCP
TXCM
REXT
PVCC33
PVCC12
CEC
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
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PCADR
Pin Diagram
OVDD
34
15
IVDD12
35
D23
36
D22
37
D21
38
D20
39
D19
40
D18
41
D17
42
D16
43
D15
44
D14
45
D13
46
D12
47
D11
48
DDCSDA
HPD
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16
44
DDCSCL
SYSRSTN
33
58
59
60
61
62
63
64
D1
D0
DE
HSYNC
VSYNC
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限
57
D2
技
56
D3
OVDD33
12
PCSCL
11
PCSDA
10
INT
9
VCC33
8
IVDD12
7
SCK/MCLK
6
WS
5
I2S0
4
I2S1
3
I2S2
2
I2S3/SPDIF
1
OVDD
PIN65: GND PAD
Figure 1. IT66121FN pin diagram
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D4
PCLK
54
IVDD12
D9
53
D5
D10
52
D6
51
D7
50
D8
49
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QFN-64 9x9
(Top View)
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IT66121FN
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IT66121FN
Pin Description
Digital Video Input Pins
Direction
Description
D[23:0]
Input
Digital video input pins.
Type
Pin No.
LVTTL
36-50,
Input
Data enable
HSYNC
Input
Horizontal sync. signal
VSYNC
Input
Vertical sync. signal
PCLK
Input
Input data clock
Input
Description
2
I S serial clock input /SPDIF master clock input
2
WS
Input
I S word select input
I2S0
Input
I2S 0 serial data input
I2S1
Input
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SCK/MCLK
Direction
28
2
Digital Audio Input Pins
Pin Name
52-55,
57-61
LVTTL
62
LVTTL
63
LVTTL
64
LVTTL
51
Type
Pin No.
LVTTL
7
LVTTL
6
LVTTL
5
LVTTL
4
LVTTL
3
LVTTL
2
Type
Pin No.
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Pin Name
2
I S 1 serial data input
2
Input
I S 2 serial data input
I2S3/SPDIF
Input
I2S 3 serial data input /SPDIF audio input
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HDMI Interface Pins
Direction
Description
CEC
I/O
CEC signal (5V-tolerant)
Schmitt
17
DDCSCL
I/O
I2C Clock for DDC (5V-tolerant)
Schmitt
16
I C Data for DDC (5V-tolerant)
Schmitt
15
Hot Plug Detection (5V-tolerant)
LVTTL
14
Type
Pin No.
I/O
HPD
Input
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DDCSDA
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Pin Name
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TMDS front-end interface pins
Description
Analog
HDMI Channel 2 positive output
TMDS
30
Analog
HDMI Channel 2 negative output
TMDS
29
TX1P
Analog
HDMI Channel 1 positive output
TMDS
27
TX1M
Analog
HDMI Channel 1 negative output
TMDS
26
TX0P
Analog
HDMI Channel 0 positive output
TMDS
25
TX0M
Analog
HDMI Channel 0 negative output
TMDS
24
TXCP
Analog
HDMI Clock Channel positive output
TMDS
22
TX2P
TX2M
Direction
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IT66121FN
TXCM
Analog
HDMI Clock Channel negative output
TMDS
21
REXT
Analog
External resistor for setting TMDS output level. Default tied to
Analog
20
AGND via a 5.6K-Ohm SMD resistor.
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Programming Pins
PCSCL
Input
Serial Programming Clock for chip programming (5V-tolerant)
PCSDA
I/O
Serial Programming Data for chip programming (5V-tolerant)
INT#
Output
Interrupt output. Default active-low (5V-tolerant)
ENTEST
Input
Must be tied low via a resistor.
PCADR
Input
Serial programming device address select
SYSRSTN
Input
Hardware reset pin. Active LOW
Power/Ground Pins
Description
IVDD12
Digital logic power (1.2V)
OVDD
OVDD33
5V-tolerant I/O power (3.3V)
VCC33
Internal ROM power (3.3V)
PVCC12
Type
Pin No.
Schmitt
12
Schmitt
11
LVTTL
10
Type
Pin No.
LVTTL
31
LVTTL
32
Schmitt
33
Pin No.
8, 35, 56
I/O Pin power (1.8V or 2.5V or 3.3V)
Power
1, 34
Power
13
Power
9
HDMI core PLL power (1.2V)
Power
18
PVCC33
HDMI core PLL power (3.3V)
Power
19
AVCC12
HDMI analog frontend power (1.2V)
Power
23
DVDD12
HDMI digital frontend power (1.2V)
Power
28
GND
Exposed ground pad
Ground
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Power
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Description
28
2
Direction
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Pin Name
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System Control Pins
Type
81
Description
51
Direction
44
Pin Name
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IT66121FN
Functional Description
Color Space
Conversion
4:2:2
4:4:4
Pixel Repeat
Video Data
Capture
&
DE Generator
SCK/MCLK
WS
I2S0
I2S1
I2S2
I2S3/SPDIF
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I2C Master
(HDCP
Controller)
，
I2C Master
(to HDCP
EEPROM)
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PCLK
VSYNC
HSYNC
DE
D[23:0]
I2C Slave
(to host)
ROMSDA
Audio Data
Capture
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INT
DDCSCL
DDCSDA
CEC
PHY
CEC
TX2P/M
HDCP Cipher
&
Encryption Enginer
，
PCADR
Configuration
Register Blocks
ROMSCL
TMDS
Transmitter
(DVI/HDMI)
TX1P/M
TX0P/M
TXCP/M
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SYSRSTN
PCSDA
28
2
PCSCL
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IT66121 is a low-power version of HDMI 1.3 transmitter and provides complete solutions for HDMI
Source systems by implementing all the required HDMI functions. In addition, advanced processing
algorithms are employed to optimize the performance of video processing such as color space
conversion and YCbCr up/down-sampling. The following picture is the functional block diagram of
IT66121, which describes clearly the data flow.
Interrupt Controller
HPD
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Figure 2. Functional block diagram of IT66121
Video Data Processing Flow
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Figure 3 depicts the video data processing flow. For the purpose of retaining maximum flexibility, most
of the block enabling and path bypassing are controlled through register programming. Please refer to
IT66121 Programming Guide for detailed and precise descriptions.
As can be seen from Figure 3, the first step of video data processing is to prepare the video data
(Data), data enable signal (DE), video clock (Clock), horizontal sync and vertical sync signals
(H/VSYNC). While the video data and video clock are always readily available from input pins, the
preparation of the data enable and sync signals require special extraction process (Embedded Ctrl.
Signals Extraction & DE Generator) depending on the format of input video data.
All the data then undergo a series of video processing including color-space conversion and YCbCr
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IT66121FN
PCLK
Clock
H/VSYNC
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DE
DE
Generator
DE
D[23:0]
YCbCr
«
RGB
(upsampler)
(CSC)
，
Data
YCbCr444
to
YCbCr422
HDCP
TMDS
Driver
(downsampler)
TX2
TX1
TX0
TXC
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YCbCr422
to
YCbCr444
28
2
H/VSYNC
DE
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Embedded Ctrl.
Signals
Extraction
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up/down-sampling. Depending on the selected input and output video formats, different processing
blocks are either enabled or bypassed via register control. For the sake of flexibility, this is all done in
software register programming. Therefore, extra care should be taken in keeping the selected
input-output format combination and the corresponding video processing block selection. Please refer
to the IT66121 Programming Guide for suggested register setting.
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Figure 3. Video data processing flow of IT66121
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Designated as D[23:0], the input video data could take on bus width of 8 bits to 24 bits. This input
interface could be configured through register setting to provide various data formats as listed in Table
1.
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Although not explicitly depicted in Figure 3, input video clock (PCLK) can be configured to be
multiplied by 0.5, 1, 2 or 4, so as to support special formats such as CCIR-656 and pixel-repeating.
This is also enabled by software programming.
General description of block functions is as follows:
Extraction of embedded control signals (Embedded Ctrl. Signals Extraction)
Input video formats with only embedded sync signals rely on this block to derive the proper Hsync,
Vsync and DE signals. Specifically, CCIR-656 video stream includes Start of Active Video (SAV) and
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IT66121FN
End of Active Video (EAV) that this block uses to extract the required control signals.
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Generation of data enable signal (DE Generator)
DE signal defines the region of active video data. In cases where the video decoders supply no such
DE signals to IT66121, this block is used to generate appropriate DE signal from Hsync, Vsync and
Clock.
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Upsampling (YCbCr422 to YCbCr444)
In cases where input signals are in YCbCr 4:2:2 format and output is selected as 4:4:4, this block is
enabled to do the upsampling.
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Bi-directional Color Space Conversion (YCbCr « RGB)
Many video decoders only offer YCbCr outputs, while DVI 1.0 supports only RGB color space. In order
to offer full compatibility between various Source and Sink combination, this block offers bi-directional
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RGB « YCbCr color space conversion (CSC). To provide maximum flexibility, the matrix coefficients
of the CSC engine in IT66121 are fully programmable. Users of IT66121 could elect to employ their
preferred conversion formula.
Downsampling (YCbCr444 to YCbCr422)
In cases where input signals are in YCbCr 4:4:4 format and output is selected as YCbCr 4:2:2, this
block is enabled to do the downsampling.
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HDCP engine (HDCP)
The HDCP engine in IT66121 handles all the processing required by HDCP mechanism in hardware.
Software intervention is not necessary except checking for revocation. Preprogrammed HDCP keys
are also embedded in IT66121. Users need not worry about the purchasing and management of the
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HDCP keys.
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TMDS driver (TMDS Driver)
The final stop of the data processing flow is TMDS serializer. The TMDS driver serializes the input
parallel data and drive out the proper electrical signals to the HDMI cable. The output current level is
controlled through connecting a precision resistor of proper value to Pin 20 (REXT).
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IT66121FN
Supported Input Video Formats
Table 1 lists the input video formats supported by IT66121.
Input Pixel clock frequency (MHz)
Video
Bus
DDR/
Hsync/
Space
Format
Width
SDR
Vsync
24
SDR
12
YCbCr
1080i
SXGA
1080p
UXGA
Separate
13.5
27
65
74.25
74.25
108
148.5
162
DDR
Separate
13.5
27
65
74.25
74.25
24
DDR
Separate
13.5
32.5
37.125
37.125
54
74.25
81
24
SDR
Separate
13.5
27
65
74.25
74.25
108
148.5
162
12
DDR
Separate
13.5
27
65
74.25
74.25
24
DDR
Separate
13.5
32.5
37.125
37.125
54
74.25
81
16/20/24
SDR
65
74.25
108
148.5
162
74.25
74.25
108
148.5
162
16/20/24
DDR
8/10/12
SDR
8/10/12
DDR
27
Embedded
13.5
27
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13.5
74.25
Separate
13.5
32.5
37.125
37.125
54
74.25
81
Embedded
13.5
32.5
37.125
37.125
54
74.25
81
65
Separate
27
54
130
148.5
148.5
Embedded
27
54
130
148.5
148.5
Separate
13.5
27
65
74.25
74.25
13.5
27
65
74.25
74.25
Embedded
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4:2:2
Separate
9
720p
28
2
4:4:4
XGA
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4:4:4
480p
，
RGB
480i
81
Color
Table 1. Input video formats supported by IT66121
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Notes:
1. Table cells that are left blanks are those format combinations that are not supported by IT66121.
2. Embedded sync signals are defined by CCIR-656 standard, using SAV/EAV sequences of FF, 00, 00, XY.
3. The original pixel clock of 480i is 13.5MHz. HDMI standard mandates that a 27MHz pixel clock be used and pixel
repeating is employed to keep the frequency range of the HDMI link within control.
Audio Data Capture and Processing
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IT66121 takes in four I2S inputs as well as one S/PDIF input of audio data. The four I 2S inputs allow
transmission of 8-channel uncompressed audio data at up to 192kHz sample rate. The S/PDIF input
allows transmission of uncompressed PCM data (IEC 60958) or compressed multi-channel data (IEC
61937) at up to 192kHz.
Note that MCLK input is optional for the IT66121. By default IT66121 generates the MCLK internally to
process the audio. Neither I2S nor S/PDIF inputs requires external MCLK signal. However, if the jitter
or the duty cycle of the input S/PDIF is considerable, coherent external MCLK input is recommended
and such configuration could be enabled through register setting. Refer to IT66121 Programming
Guide for such setting.
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IT66121FN
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High-Bit-Rate (HBR) Audio is first introduced in the HDMI 1.3 standard. It is called upon by high-end
audio system such as DTS-HD and Dolby TrueHD. No specific interface is defined by the HBR
standard. The IT66121 supports HBR audio in two ways. One is to employ the four I2S inputs
simultaneously, where the original streaming HBR audio is broken into four parallel data streams
before entering the IT66121. The other is to use the S/PDIF input port. Since the data rate here is as
high as 98.304Mbps, a coherent MCLK is required in this application.
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Interrupt Generation
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The system micro-controller should take in the interrupt signal output by IT66121 at PIN 10 (INT). INT
pin can be configured as Push-pull or Tristate mode depending on user’s application. IT66121
generates an interrupt signal with events involving the following signals or situations:
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1. Hot-plug detection (Pin 14, HPD) experiences state changes.
2. Receiver detection circuit reports the presence or absence of an active termination at the TMDS
Clock Channel (RxSENDetect)
3. DDC bus is hanged for any reasons
4. Audio FIFO overflows
5. HDCP authentication fails
6. Audio/Video data is stable or not
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A typical initialization of HDMI link should be based on interrupt signal and appropriate register probing.
Recommended flow is detailed in IT66121 Programming Guide. Simply put, the microcontroller should
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monitor the HPD status first. Upon valid HPD event, move on to check RxSENDetect register to see if
the receiver chip is ready for further handshaking. When RxSENDetect is asserted, start reading EDID
data through DDC channels and carry on the rest of the handshaking subsequently.
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If the micro-controller makes no use of the interrupt signal as well as the above-mentioned status
registers, the link establishment might fail. Please do follow the suggested initialization flow
recommended in IT66121 Programming Guide.
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IT66121FN
Configuration and Function Control
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IT66121 includes two serial programming ports by default (i.e. with embedded HDCP keys): one for
interfacing with micro-controller, the other for accessing the DDC channels of HDMI link.
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The serial programming interface for interfacing the micro-controller is a slave interface, comprising
PCSCL (Pin 12) and PCSDA (Pin 11). The micro-controller uses this interface to monitor all the
statuses and control all the functions. Two device addresses are available, depending on the input
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logic level of PCADR (Pin 32). If PCADR is pulled high by the user, the device address is 0x9A. If
pulled low, 0x98.
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The I2C interface for accessing the DDC channels of the HDMI link is a master interface, comprising
DDCSCL (Pin 16) and DDCSDA (Pin 15). IT66121 uses this interface to read the EDID data and
perform HDCP authentication protocol with the sink device over the HDMI cable.
For temporarily storing the acquired EDID data, IT66121 includes a 32 bytes dedicated FIFO. The
micro-controller may command IT66121 to acquire 32 bytes of EDID information, read it back and then
continue to read the next 32 bytes until getting all necessary EDID information.
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The HDCP protocol of IT66121 is completely implemented in hardware. No software intervention is
needed except for revocation list checking. Various HDCP-related statuses are stored in HDCP
Slave Addr (7)
R A
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registers for the reference of micro-controller. Refer to IT66121 Programming Guide for detailed
register descriptions. The HDCP Standard also specifies a special message read protocol other than
the standard I2C protocol. See Figure 4 for checking HDCP port link integrity.
Read Data (8)
A
Read Data (8)
A
Read Data (8)
NA P
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S=Start; R=Read; A=Ack; NA=No Ack; P=Stop
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Figure 4. HDCP port link integrity message read
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圳
All serial programming interfaces conform to standard I2C transactions and operate at up to 100kHz.
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T8720F V0.7.1 Apr-2013 Rev:1.02
13/40
IT66121FN
Electrical Specifications
Unit
Core logic supply voltage
-0.5
1.5
V
OVDD33
5V-tolerance I/O pins supply voltage
-0.3
4.0
V
OVDD
1.8V I/O pins supply voltage (OVDD=1.8V)
-0.3
2.5
V
OVDD
2.5V I/O pins supply voltage (OVDD=2.5V)
-0.3
3.2
V
OVDD
3.3V I/O pins supply voltage (OVDD=3.3V)
-0.3
4.0
V
VCC33
ROM supply voltage
-0.3
4.0
V
AVCC12
HDMI analog frontend supply voltage
-0.5
1.5
V
PVCC12
HDMI core PLL supply voltage
-0.5
1.5
V
PVCC33
HDMI core PLL supply voltage
-0.3
4.0
V
DVDD12
HDMI AFE digital supply voltage
-0.5
1.5
V
VI
Input voltage
-0.3
OVDD+0.3
V
VO
Output voltage
-0.3
OVDD+0.3
V
TJ
Junction Temperature
125
C
TSTG
Storage Temperature
150
C
ESD_HB
Human body mode ESD sensitivity
51
IVDD12
Typ
44
Min.
QQ
:71
Parameter
07
55
-3
68
53
28
2
，
Symbol
81
Max
9
Absolute Maximum Ratings
-65
V
，
2000
有
限
公
司
ESD_MM
Machine mode ESD sensitivity
200
V
Notes:
1. Stresses above those listed under Absolute Maximum Ratings might result in permanent damage to the device.
2. Refer to Functional Operation Conditions for normal operation.
Typ
Max
Unit
讯
科
Parameter
IVDD12
Core logic supply voltage
1.14
1.2
1.26
V
OVDD33
I/O pins supply voltage
3.0
3.3
3.6
V
1.8V I/O pins supply voltage
1.62
1.8
1.98
V
2.5V I/O pins supply voltage
2.25
2.5
2.75
V
3.0
3.3
3.6
V
ROM supply voltage
3.0
3.3
3.6
V
HDMI analog frontend supply voltage
1.14
1.2
1.26
V
PVCC12
HDMI core PLL supply voltage
1.14
1.2
1.26
V
PVCC33
HDMI core PLL supply voltage
3.0
3.3
3.6
V
DVDD12
HDMI AFE digital supply voltage
1.14
1.2
1.26
V
VCCNOISE
Supply noise
100
mVpp
TA
Ambient temperature
70
C
金
合
Min.
市
Symbol
技
Functional Operation Conditions
OVDD
VCC33
AVCC12
深
圳
3.3V I/O pins supply voltage
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0
25
T8720F V0.7.1 Apr-2013 Rev:1.02
14/40
IT66121FN
Junction to ambient thermal resistance
ja
Notes:
1. AVCC12, PVCC12 and PVCC33 should be regulated.
2. See System Design Consideration for supply decoupling and regulation.
C/W
深
圳
市
金
合
讯
科
技
有
限
公
司
，
07
55
-3
68
53
28
2
，
QQ
:71
44
51
81
9
40
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T8720F V0.7.1 Apr-2013 Rev:1.02
15/40
IT66121FN
DC Electrical Specification
Under functional operation conditions
VOH
IIN
IOZ
IOL
Vswing
Schmitt
0.63
0.75
0.7
0.94
9
0.8
1.06
1.22
V
V
1.39
Schmitt trigger positive
Schmitt
going threshold voltage1
Output low voltage1
1.05
LVTTL
1
1
Input leakage current
Tri-state output leakage
current1
Serial programming
TMDS output
LVTTL
1.4
all
-10
all
-10
TMDS
single-ended swing3
Single-ended standby
TMDS
output current3
1.14
1.35
0.4
Schmitt
output sink current2
QQ
:71
44
going threshold voltage1
81
0.6
V
400
+10
600
1.70
0.4
2.1
+10
1.48
1.92
V
0.4
V
V
2.9
+10
-10
+10
A
-10
+10
-10
+10
A
2.5
10
mA
400
600
mV
10
A
-10
400
600
10
10
公
IOFF
LVTTL
Schmitt trigger negative
Output high voltage
2.0
，
VOL
1.7
Unit
28
2
VT+
1.2
07
55
-3
68
53
VT-
Input low voltage
LVTTL
1
，
VIL
Input high voltage1
For 3.3V OVDD
Min Typ Max
司
VIH
Pin Type
For 2.5V OVDD
Min Typ Max
51
Symbol Parameter
For 1.8V OVDD
Min Typ Max
市
金
合
讯
科
技
有
限
Notes:
1. Guaranteed by I/O design.
2. The serial programming output ports are not real open-drain drivers. Sink current is guaranteed by I/O design
under the condition of driving the output pin with 0.2V. In a real serial programming environment, multiple devices
and pull-up resistors could be present on the same bus, rendering the effective pull-up resistance much lower
than that specified by the I2C Standard. When set at maximum current, the serial programming output ports of
IT66121 are capable of pulling down an effective pull-up resistance as low as 500 connected to 5V termination
voltage to the standard I2C VIL. When experiencing insufficient low level problem, try setting the current level to
higher than default. Refer to IT66121 Programming Guide for proper register setting.
3. Limits defined by HDMI standard
深
圳
Audio AC Timing Specification
Under functional operation conditions
Symbol Parameter
FS_I2S
I2S sample rate
FS_SPDIF S/PDIF sample rate
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Conditions
Up to 8 channels
Min
32
2 channels
32
Typ
Max
192
Unit
kHz
192
kHz
T8720F V0.7.1 Apr-2013 Rev:1.02
16/40
IT66121FN
Fpixel
PCLK pixel clock frequency
TCDE
PCLK dual-edged clock period2
2
FCDE
PCLK dual-edged clock frequency
TPDUTY
PCLK clock duty cycle
TPJ
PCLK worst-case jitter
Single-edged
clocking
25
165
MHz
Dual-edged
13.47
40
ns
clocking
25
MHz
40%
TS
Video data setup time
TH
Video data hold time
3
TSDE
Video data setup time3
Single-edged
clocking
Unit
ns
60%
2.0
ns
ns
0.7
ns
1.5
ns
，
Dual-edged
1.5
Max
40
74.25
QQ
:71
3
Typ
9
1
Min
6.06
51
Conditions
44
Under functional operation conditions
Symbol Parameter
Tpixel
PCLK pixel clock period1
81
Video AC Timing Specification
3
深
圳
市
金
合
讯
科
技
有
限
公
司
，
07
55
-3
68
53
28
2
clocking
THDE
Video data hold time
0.7
ns
Notes:
1. Fpixel is the inverse of Tpixel. Operating frequency range is given here while the actual video clock frequency
should comply with all video timing standards. Refer to Table 1 for supported video timings and corresponding
pixel frequencies.
2. 12-bit dual-edged clocking is supported up to 74.5MHz of PCLK frequency, which covers 720p/1080i.
3. All setup time and hold time specifications are with respect to the latching edge of PCLK selected by the user
through register programming.
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T8720F V0.7.1 Apr-2013 Rev:1.02
17/40
IT66121FN
Operation Supply Current Specification

Normal Operation Mode
TYPICAL Mode
TTL input test 3.3V, 2.5V and 1.8V
HDCP
In/Out
Audio
Deep Color
48K2Ch
8bits
Off
8bits
81
Mode
Video Pattern
51
Resolution
9
Video
44
Format
720P@60Hz
HDMI
On
DVI
Off
YUV444 to
RGB444
QQ
:71
480P@60Hz
MAX Mode
TTL input test 3.3V, 2.5V and 1.8V
Mode
Audio
Deep Color
司
Video
Resolution
28
2
No CSC
07
55
-3
68
53
1600x1200@60Hz
，
1080P@60Hz
HDCP
In/Out
192K2Ch
8bits
No CSC
Off
8bits
Video Pattern
，
Format
480P@60Hz
HDMI
On
市
深
圳
IOVDD33
IVCC33
IPVCC33
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Off
技
讯
科
DVI
金
合
Symbol
RGB444
有
限
1080P@60Hz
1600x1200@60Hz
YUV444to
公
720P@60Hz
Video Timing
PCLK(MHz)
TYPICAL
MAX
Unit
480P60 8-bit
27.0
0.07
0.07
mA
720P60 8-bit
74.25
0.07
0.07
mA
1080P60 8-bit
148.5
0.07
0.07
mA
1600x1200P60 8-bit
162.0
0.07
0.07
mA
480P60 8-bit
27.0
0.04
0.04
mA
720P60 8-bit
74.25
0.04
0.04
mA
1080P60 8-bit
148.5
0.04
0.04
mA
1600x1200P60 8-bit
162.0
0.00
0.00
mA
480P60 8-bit
27.0
1.68
1.68
mA
T8720F V0.7.1 Apr-2013 Rev:1.02
18/40
IT66121FN
74.25
5.77
5.77
mA
1080P60 8-bit
148.5
3.16
3.16
mA
1600x1200P60 8-bit
162.0
3.53
3.53
mA
480P60 8-bit
27.0
4.77
6.10
mA
720P60 8-bit
74.25
11.02
13.24
mA
1080P60 8-bit
148.5
21.22
1600x1200P60 8-bit
162.0
16.745
480P60 8-bit
27.0
1.36
720P60 8-bit
74.25
3.44
1080P60 8-bit
148.5
1600x1200P60 8-bit
162.0
480P60 8-bit
27.0
720P60 8-bit
81
20.6
mA
1.36
mA
3.44
mA
6.69
6.69
mA
7.2
7.2
mA
9.95
9.95
mA
74.25
10.69
10.69
mA
1080P60 8-bit
148.5
11.84
11.84
mA
1600x1200P60 8-bit
162.0
12.0
12.0
mA
480P60 8-bit
27.0
0.87
0.87
mA
720P60 8-bit
74.25
2.32
2.32
mA
1080P60 8-bit
148.5
2.6
2.6
mA
1600x1200P60 8-bit
162.0
2.85
2.85
mA
480P60 8-bit
27.0
0.13
0.15
mA
720P60 8-bit
74.25
0.3
0.37
mA
1080P60 8-bit
148.5
0.49
0.65
mA
1600x1200P60 8-bit
162.0
0.44
0.75
mA
480P60 8-bit
27.0
26.676
28.338
mW
720P60 8-bit
74.25
53.358
56.253
mW
1080P60 8-bit
148.5
63.228
68.848
mW
1600x1200P60 8-bit
162.0
63.84
65.535
mW
480P60 8-bit
27.0
0.036
0.065
mA
IOVDD
720P60 8-bit
74.25
0.132
0.164
mA
TTL input is 2.5V
1080P60 8-bit
148.5
0.248
0.328
mA
1600x1200P60 8-bit
162.0
0.264
0.461
mA
480P60 8-bit
27.0
25.6752
27.372
mW
07
55
-3
68
53
IAVCC12

有
限
技
讯
科
51
44
深
圳
市
金
合
PTOTAL
TTL input is 3.3V
公
When OVDD=3.3V
IOVDD
TTL input is 3.3V
24.63
司
，
IPVCC12

28
2
IDVDD12
，
mA
QQ
:71
IIVDD12
9
720P60 8-bit
When OVDD=2.5V
PTOTAL
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T8720F V0.7.1 Apr-2013 Rev:1.02
19/40
IT66121FN
TTL input is 2.5V
720P60 8-bit
74.25
50.7324
53.6658
mW
1080P60 8-bit
148.5
60.4056
65.1216
mW
1600x1200P60 8-bit
162.0
60.7368
62.6682
mW
480P60 8-bit
27.0
0.000
IOVDD
720P60 8-bit
74.25
0.043
TTL input is 1.8V
1080P60 8-bit
148.5
0.115
1600x1200P60 8-bit
162.0
480P60 8-bit
27.0
PTOTAL
720P60 8-bit
74.25
TTL input is 1.8V
1080P60 8-bit
148.5
1600x1200P60 8-bit
162.0

0.052
mA
0.172
mA
QQ
:71
9
81
mA
0.121
0.228
mA
25.632
27.294
mW
50.6256
53.5314
mW
60.246
64.933
mW
60.5652
62.3886
mW
Standby Mode
Standby Mode
28
2
，
44
51
0.000
07
55
-3
68
53

When OVDD=1.8V
TTL input test 3.3V, 2.5V and 1.8V
HDCP
Video In/Out Format
1080P@60Hz
On
YUV444toRGB444
Audio
Deep Color
On
8bits
Video Pattern
Unit
讯
科
Standby
PCLK / No PCLK
Unit
0.023 / 0.023
mA
0.000 / 0.000
mA
3.3V
0.023 / 0.023
mA
0.000 / 0.000
mA
0.539 / 0.114
mA
IDVDD12
0.174 / 0.173
mA
IAVCC12
0.000 / 0.000
mA
1.2V
0.846 / 0.287
mA
IPVCC12
0.133 / 0.000
mA
IOVDD (3.3V)
0.102 / 0.000
mA
IOVDD (3.3V)
0.102 / 0.000
mA
IOVDD (2.5V)
0.056 / 0.000
mA
IOVDD (2.5V)
0.056 / 0.000
mA
0.016 / 0.000
TTL input is 3.3V
mA
IOVDD (1.8V)
0.016 / 0.000
mA
技
Standby
PCLK / No PCLK
深
圳
有
限
公
司
，
Resolution
Symbol
IVCC33
IPVCC33
市
IIVDD12
金
合
IOVDD33
IOVDD (1.8V)
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PTOTAL
Symbol
1.4277 / 0.4203
mW
T8720F V0.7.1 Apr-2013 Rev:1.02
20/40
IT66121FN
TTL input is 2.5V
PTOTAL
1.2311 / 0.4203
mW
TTL input is 1.8V
PTOTAL
1.1199 / 0.4203
mW
Notes:
1. PTOTAL are calculated by multiplying the supply currents with their corresponding supply voltage and summing up
all the items.
81
9
Video Data Bus Mappings
RGB
SDR/DDR
24
SDR
12
DDR
24
DDR
4:4:4
24
4:4:4
DDR
24
司
，
SDR
公
4:2:2
DDR
SDR
8/10/12
DDR
有
限
8/10/12
Clocking
1X
0.5X
1X
0.5X
Separate
Embedded
Separate
Embedded
Separate
Embedded
Separate
Embedded
1X
0.5X
2X
1X
Table
Figure
3
5
12
12
13
13
3
5
12
12
13
13
4
6
5
7
14
14
Note 1
8
10
7
9
Note 2
15
15
讯
科
技
Separate
DDR
16/20/24
16/20/24
Separate
SDR
12
YCbCr
H/Vsync
，
Bus Width
28
2
Video Format
07
55
-3
68
53
Color Space
QQ
:71
44
51
IT66121 supports various input data mappings and formats, including those with embedded control
signals only. Corresponding register setting is mandatory for any chosen input data mappings. Refer
to IT66121 Programming Guide for detailed instruction.
Table 2. Input video format supported by IT66121
深
圳
市
金
合
Notes:
1. The mapping of this format is the same as Table 5 and the timing diagram is similar to Figure 14 except the syncs
are embedded.
2. The mapping of this format is the same as Table 8 and the timing diagram is similar to Figure 15 except the syncs
are separated.
With certain input formats, not all 24 data input pins are used. In that case, it is recommended to tie the
unused input pins to ground.
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T8720F V0.7.1 Apr-2013 Rev:1.02
21/40
IT66121FN
24-bit RGB/YCbCr444 (Separate Syncs)
司
公
有
限
81
51
44
QQ
:71
，
28
2
YCbCr
Cb0
Cb1
Cb2
Cb3
Cb4
Cb5
Cb6
Cb7
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Cr0
Cr1
Cr2
Cr3
Cr4
Cr5
Cr6
Cr7
HSYNC
VSYNC
DE
07
55
-3
68
53
RGB
B0
B1
B2
B3
B4
B5
B6
B7
G0
G1
G2
G3
G4
G5
G6
G7
R0
R1
R2
R3
R4
R5
R6
R7
HSYNC
VSYNC
DE
，
Pin Name
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
HSYNC
VSYNC
DE
9
These are the simplest formats, with a complete definition of every pixel in each clock period. Timing
diagram is depicted in Fig.5.
D[23:16]
讯
科
技
Table 3. Mappings of 24-bit RGB/YCbCr444 (separate syncs)
val
R/Crpix0 R/Crpix1 R/Crpix2 R/Crpix3 R/Crpix4 R/Crpix5 R/Crpix6
....
val
val
val
D[15:8]
val
G/Ypix0 G/Ypix1 G/Ypix2 G/Ypix3 G/Ypix4 G/Ypix5 G/Ypix6
....
val
val
val
val
B/Cbpix0 B/Cbpix1 B/Cbpix2 B/Cbpix3 B/Cbpix4 B/Cbpix5 B/Cbpix6
....
val
val
val
市
金
合
blank
深
圳
D[7:0]
Pixel0
Pixel1
Pixel2
Pixel3
Pixel4
Pixel5
Pixel6
...
blank
PCLK
DE
H/VSYNC
Figure 5. 24-bit RGB/YCbCr444 (separate syncs)
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T8720F V0.7.1 Apr-2013 Rev:1.02
22/40
IT66121FN
16/20/24-bit YCbCr422 with Separate Syncs
YCbCr 4:2:2 format does not have one complete pixel for every clock period. Luminace channel (Y) is
given for every pixel, while the two chroma channels are given alternatively on every other clock
period. The DE period should contain an even number of clock periods.
QQ
:71
44
51
81
9
YCbCr 4:2:2 24-bit
Pixel#2N Pixel#2N+1
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
Y8
Y8
Y9
Y9
Y10
Y10
Y11
Y11
Cb0
Cr0
Cb1
Cr1
Cb2
Cr2
Cb3
Cr3
Cb4
Cr4
Cb5
Cr5
Cb6
Cr6
Cb7
Cr7
Cb8
Cr8
Cb9
Cr9
Cb10
Cr10
Cb11
Cr11
HSYNC
HSYNC
VSYNC
VSYNC
DE
DE
07
55
-3
68
53
28
2
，
YCbCr 4:2:2 20-bit
Pixel#2N Pixel#2N+1
grounded
grounded
grounded
grounded
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
Y8
Y8
Y9
Y9
grounded
grounded
grounded
grounded
Cb0
Cr0
Cb1
Cr1
Cb2
Cr2
Cb3
Cr3
Cb4
Cr4
Cb5
Cr5
Cb6
Cr6
Cb7
Cr7
Cb8
Cr8
Cb9
Cr9
HSYNC
HSYNC
VSYNC
VSYNC
DE
DE
，
司
公
有
限
技
Pin Name
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
HSYNC
VSYNC
DE
YCbCr 4:2:2 16-bit
Pixel#2N Pixel#2N+1
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
Cb0
Cr0
Cb1
Cr1
Cb2
Cr2
Cb3
Cr3
Cb4
Cr4
Cb5
Cr5
Cb6
Cr6
Cb7
Cr7
HSYNC
HSYNC
VSYNC
VSYNC
DE
DE
blank
Pixel0
Pixel1
Pixel2
Pixel3
Pixel4
Pixel5
Pixel6
...
D[23:12]
val
Cbpix0
Crpix0
Cbpix2
Crpix2
Cbpix4
Crpix4
Cbpix6
....
val
val
val
市
金
合
讯
科
Table 4. Mappings of 16/20/24-bit YCbCr422 with separate syncs
val
Ypix0
Ypix1
Ypix2
Ypix3
Ypix4
Ypix5
Ypix6
....
val
val
val
深
圳
D[11:0]
blank
PCLK
DE
H/VSYNC
Figure 6. 16/20/24-bit YCbCr422 with separate syncs
www.ite.com.tw
T8720F V0.7.1 Apr-2013 Rev:1.02
23/40
IT66121FN
16/20/24-bit YCbCr422 with Embedded Syncs
This is similar to the previous format. The only difference is that the syncs are embedded. Bus width
could be 16-bit, 20-bit or 24-bit.
81
51
44
QQ
:71
，
28
2
07
55
-3
68
53
司
公
YCbCr 4:2:2 24-bit
Pixel#2N Pixel#2N+1
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
Y8
Y8
Y9
Y9
Y10
Y10
Y11
Y11
Cb0
Cr0
Cb1
Cr1
Cb2
Cr2
Cb3
Cr3
Cb4
Cr4
Cb5
Cr5
Cb6
Cr6
Cb7
Cr7
Cb8
Cr8
Cb9
Cr9
Cb10
Cr10
Cb11
Cr11
grounded
grounded
grounded
grounded
grounded
grounded
9
YCbCr 4:2:2 20-bit
Pixel#2N Pixel#2N+1
grounded
grounded
grounded
grounded
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
Y8
Y8
Y9
Y9
grounded
grounded
grounded
grounded
Cb0
Cr0
Cb1
Cr1
Cb2
Cr2
Cb3
Cr3
Cb4
Cr4
Cb5
Cr5
Cb6
Cr6
Cb7
Cr7
Cb8
Cr8
Cb9
Cr9
grounded
grounded
grounded
grounded
grounded
grounded
，
YCbCr 4:2:2 16-bit
Pixel#2N Pixel#2N+1
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
Cb0
Cr0
Cb1
Cr1
Cb2
Cr2
Cb3
Cr3
Cb4
Cr4
Cb5
Cr5
Cb6
Cr6
Cb7
Cr7
grounded
grounded
grounded
grounded
grounded
grounded
有
限
Pin Name
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
HSYNC
VSYNC
DE
讯
科
技
Table 5. Mappings of 16/20/24-bit YCbCr422 with embedded syncs
金
合
blank
val
深
圳
D[11:0]
市
D[23:12]
val
blank
SAV
Pixel0
Pixel1
Pixel2
Pixel3
Pixel4
Pixel5
Pixel6
...
EAV
val
val
val
val
Cbpix0
Crpix0
Cbpix2
Crpix2
Cbpix4
Crpix4
Cbpix6
....
val
val
FF
00
00
XY
Ypix0
Ypix1
Ypix2
Ypix3
Ypix4
Ypix5
Ypix6
....
FF
00
PCLK
DE
H/VSYNC
Figure 7. 16/20/24-bit YCbCr422 with embedded syncs
www.ite.com.tw
T8720F V0.7.1 Apr-2013 Rev:1.02
24/40
IT66121FN
深
圳
市
金
合
讯
科
技
有
限
公
司
，
07
55
-3
68
53
28
2
，
QQ
:71
44
51
81
9
Note:
1. FF, 00, 00, XY information are mapped to D[11:4]
2. 20-bit mode is compatible with BT1120 format 20-bit mode
www.ite.com.tw
T8720F V0.7.1 Apr-2013 Rev:1.02
25/40
IT66121FN
16/20/24-bit YCbCr422 with Embedded Syncs (BTA-T1004 Format)
The BTA-T1004 format is similar to the previous format except the SAV and EAV positions.
QQ
:71
44
51
81
9
YCbCr 4:2:2 24-bit
Pixel#2N Pixel#2N+1
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
Y8
Y8
Y9
Y9
Y10
Y10
Y11
Y11
Cb0
Cr0
Cb1
Cr1
Cb2
Cr2
Cb3
Cr3
Cb4
Cr4
Cb5
Cr5
Cb6
Cr6
Cb7
Cr7
Cb8
Cr8
Cb9
Cr9
Cb10
Cr10
Cb11
Cr11
grounded
grounded
grounded
grounded
grounded
grounded
07
55
-3
68
53
28
2
，
YCbCr 4:2:2 20-bit
Pixel#2N Pixel#2N+1
grounded
grounded
grounded
grounded
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
Y8
Y8
Y9
Y9
grounded
grounded
grounded
grounded
Cb0
Cr0
Cb1
Cr1
Cb2
Cr2
Cb3
Cr3
Cb4
Cr4
Cb5
Cr5
Cb6
Cr6
Cb7
Cr7
Cb8
Cr8
Cb9
Cr9
grounded
grounded
grounded
grounded
grounded
grounded
，
司
公
有
限
Pin Name
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
HSYNC
VSYNC
DE
YCbCr 4:2:2 16-bit
Pixel#2N Pixel#2N+1
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
Cb0
Cr0
Cb1
Cr1
Cb2
Cr2
Cb3
Cr3
Cb4
Cr4
Cb5
Cr5
Cb6
Cr6
Cb7
Cr7
grounded
grounded
grounded
grounded
grounded
grounded
讯
科
技
Table 6. Mappings of YCbCr422 with embedded syncs (BTA-T1004 format)
blank
blank
D[23:12]
Pixel0
Pixel1
Pixel2
Pixel3
Pixel4
Pixel5
Pixel6
...
EAV
val
FF
00
Cbpix0
Crpix0
Cbpix2
Crpix2
Cbpix4
Crpix4
Cbpix6
....
FF
00
val
val
00
XY
Ypix0
Ypix1
Ypix2
Ypix3
Ypix4
Ypix5
Ypix6
....
00
XY
val
深
圳
市
D[11:0]
金
合
SAV
PCLK
DE
H/VSYNC
Figure 8. 16/20/24-bit YCbCr422 with embedded syncs (BTA-T1004 format)
Note:
1. FF, 00, 00, XY information are mapped to D[23:16] and D[11:4]
www.ite.com.tw
T8720F V0.7.1 Apr-2013 Rev:1.02
26/40
IT66121FN
8/10/12-bit YCbCr422 with Embedded Syncs
51
44
QQ
:71
28
2
，
司
公
有
限
技
YCbCr 4:2:2 12-bit
Pixel#2N
Pixel#2N+1
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
C0
Y0
C1
Y1
C2
Y2
C3
Y3
C4
Y4
C5
Y5
C6
Y6
C7
Y7
C8
Y9
C9
Y9
C10
Y10
C11
Y11
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
，
YCbCr 4:2:2 10-bit
1st PCLK
2nd PCLK
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
C0
Y0
C1
Y1
C2
Y2
C3
Y3
C4
Y4
C5
Y5
C6
Y6
C7
Y7
C8
Y8
C9
Y9
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
07
55
-3
68
53
YCbCr 4:2:2 8-bit
1st PCLK
2nd PCLK
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
C0
Y0
C1
Y1
C2
Y2
C3
Y3
C4
Y4
C5
Y5
C6
Y6
C7
Y7
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
Pin Name
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
HSYNC
VSYNC
DE
81
9
This format is another variation of the YCbCr formats. The bus width is further reduced by half
compared from the previous YCbCr 4:2:2 formats, to either 8-bit, 10-bit or 12-bit. To compensate for
the halving of data bus, PCLK is doubled. With the double-rate input clock, luminance channel (Y) and
chroma channels (Cb or Cr) are alternated.
blank
blank
SAV
Pixel0
Pixel1
Pixel2
...
...
Crpix2/3
....
EAV
市
金
合
讯
科
Table 7. Mappings of 8/10/12-bit YCbCr422 with embedded syncs
深
圳
D[23:16]&[3:0]
D[15:4]
val
FF
00
00
XY
Cbpix0/1
Ypix0
Crpix0/1
Ypix1
Cbpix2/3
Ypix2
FF
00
PCLK
DE
H/VSYNC
www.ite.com.tw
T8720F V0.7.1 Apr-2013 Rev:1.02
27/40
IT66121FN
Figure 9. 8/10/12-bit YCbCr422 with embedded syncs
深
圳
市
金
合
讯
科
技
有
限
公
司
，
07
55
-3
68
53
28
2
，
QQ
:71
44
51
81
9
Note:
1. FF, 00, 00, XY information are mapped to D[15:8]
2. 8-bit mode is compatible with CCIR656 format
3. 10-bit mode is compatible with BT1120 format 10-bit mode
www.ite.com.tw
T8720F V0.7.1 Apr-2013 Rev:1.02
28/40
IT66121FN
8/10/12-bit YCbCr422 with Separate Syncs
This format is simply the variation of previously mentioned one plus separate syncs.
YCbCr 4:2:2 10-bit
YCbCr 4:2:2 8-bit
2nd PCLK
1st PCLK
2nd PCLK
Pixel#2N
Pixel#2N+1
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
C0
C1
C2
C3
C4
C5
C6
C7
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
grounded
grounded
grounded
grounded
grounded
grounded
C0
C1
C2
C3
C4
C5
C6
C7
C8
C9
grounded
grounded
grounded
grounded
grounded
grounded
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
Y9
grounded
grounded
grounded
grounded
C0
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
grounded
grounded
grounded
grounded
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y9
Y9
Y10
Y11
有
限
公
81
51
44
QQ
:71
，
28
2
07
55
-3
68
53
司
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
HSYNC
VSYNC
DE
9
1st PCLK
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
HSYNC
VSYNC
DE
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
HSYNC
VSYNC
DE
，
Pin Name
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
HSYNC
VSYNC
DE
YCbCr 4:2:2 12-bit
技
Table 8. Mappings of 8/10/12-bit YCbCr422 with separate syncs
金
合
D[23:16]&[3:0]
讯
科
blank
val
Cbpix0/1
Ypix0
Pixel1
Crpix0/1
Ypix1
Pixel2
Cbpix2/3
Ypix2
...
...
Crpix2/3
....
blank
val
val
val
市
D[15:4]
Pixel0
深
圳
PCLK
DE
H/VSYNC
Figure 10. 8/10/12-bit YCbCr422 with separate syncs
www.ite.com.tw
T8720F V0.7.1 Apr-2013 Rev:1.02
29/40
IT66121FN
The IT66121 supports another IO mapping method of YCbCr 4:2:2 formats which we call
Non-sequential IO Mode. The only difference between these two modes is the Y/Cb/Cr data mapping
sequence of the IO pin. The following tables show the different mappings of these two modes.
Non-sequential IO mode of 16/20/24-bit YCbCr422
QQ
:71
44
51
81
9
YCbCr 4:2:2 24-bit
Pixel#2N Pixel#2N+1
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Cb0
Cr0
Cb1
Cr1
Cb2
Cr2
Cb3
Cr3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
Y8
Y8
Y9
Y9
Y10
Y10
Y11
Y11
Cb4
Cr4
Cb5
Cr5
Cb6
Cr6
Cb7
Cr7
Cb8
Cr8
Cb9
Cr9
Cb10
Cr10
Cb11
Cr11
HSYNC
HSYNC
VSYNC
VSYNC
DE
DE
07
55
-3
68
53
28
2
，
YCbCr 4:2:2 20-bit
Pixel#2N Pixel#2N+1
grounded
grounded
grounded
grounded
Y0
Y0
Y1
Y1
grounded
grounded
grounded
grounded
Cb0
Cr0
Cb1
Cr1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
Y8
Y8
Y9
Y9
Cb2
Cr2
Cb3
Cr3
Cb4
Cr4
Cb5
Cr5
Cb6
Cr6
Cb7
Cr7
Cb8
Cr8
Cb9
Cr9
HSYNC
HSYNC
VSYNC
VSYNC
DE
DE
，
司
公
有
限
Pin Name
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
HSYNC
VSYNC
DE
YCbCr 4:2:2 16-bit
Pixel#2N Pixel#2N+1
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
Cb0
Cr0
Cb1
Cr1
Cb2
Cr2
Cb3
Cr3
Cb4
Cr4
Cb5
Cr5
Cb6
Cr6
Cb7
Cr7
HSYNC
HSYNC
VSYNC
VSYNC
DE
DE
技

深
圳
市
金
合
讯
科
Table 9. Mappings of 16/20/24-bit YCbCr422 non-sequential IO mode
www.ite.com.tw
T8720F V0.7.1 Apr-2013 Rev:1.02
30/40
IT66121FN
Non-sequential IO mode of 8/10/12-bit YCbCr422
QQ
:71
44
51
81
9
YCbCr 4:2:2 12-bit
Pixel#2N
Pixel#2N+1
C0
Y0
C1
Y1
C2
Y2
C3
Y3
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
C4
Y4
C5
Y5
C6
Y6
C7
Y7
C8
Y9
C9
Y9
C10
Y10
C11
Y11
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
，
YCbCr 4:2:2 10-bit
1st PCLK
2nd PCLK
grounded
grounded
grounded
grounded
C0
Y0
C1
Y1
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
C2
Y2
C3
Y3
C4
Y4
C5
Y5
C6
Y6
C7
Y7
C8
Y8
C9
Y9
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
28
2
YCbCr 4:2:2 8-bit
1st PCLK
2nd PCLK
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
C0
Y0
C1
Y1
C2
Y2
C3
Y3
C4
Y4
C5
Y5
C6
Y6
C7
Y7
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
07
55
-3
68
53
Pin Name
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
HSYNC
VSYNC
DE
，

公
司
Table 10. Mappings of 8/10/12-bit YCbCr422 non-sequential IO mode
深
圳
市
金
合
讯
科
技
有
限
In additional to the previous input formats, there are three options can be supported by the IT66121.
DE-only option can be used for those input formats without H/VSync information. Dual-edge triggering
with half bus width option can be used to reduce the necessary bus width and dual-edge triggering
with half pixel clock option allows half input pixel clock. No all the input formats listed above can
support three options and please refer to the IT66121 programming guide for more information. Some
examples shown below are the corresponding timing relations when these options are enabled.
www.ite.com.tw
T8720F V0.7.1 Apr-2013 Rev:1.02
31/40
IT66121FN
81
51
44
QQ
:71
，
28
2
公
司
YCbCr
Cb0
Cb1
Cb2
Cb3
Cb4
Cb5
Cb6
Cb7
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Cr0
Cr1
Cr2
Cr3
Cr4
Cr5
Cr6
Cr7
grounded
grounded
DE
07
55
-3
68
53
RGB
B0
B1
B2
B3
B4
B5
B6
B7
G0
G1
G2
G3
G4
G5
G6
G7
R0
R1
R2
R3
R4
R5
R6
R7
grounded
grounded
DE
，
Pin Name
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
HSYNC
VSYNC
DE
9
DE-Only Option: use 24-bit RGB/YCbCr444 (DE-only mode) as example
R/Crpix0 R/Crpix1 R/Crpix2 R/Crpix3 R/Crpix4 R/Crpix5 R/Crpix6
....
val
val
val
val
G/Ypix0 G/Ypix1 G/Ypix2 G/Ypix3 G/Ypix4 G/Ypix5 G/Ypix6
....
val
val
val
val
B/Cbpix0 B/Cbpix1 B/Cbpix2 B/Cbpix3 B/Cbpix4 B/Cbpix5 B/Cbpix6
....
val
val
val
金
合
D[15:8]
...
val
Pixel1
Pixel2
Pixel3
Pixel4
Pixel5
blank
市
D[7:0]
Pixel0
技
D[23:16]
Pixel6
讯
科
blank
有
限
Table 11. Mappings of 24-bit RGB/YCbCr444 (DE-only mode)
深
圳
PCLK
DE
H/VSYNC
Figure 11. 24-bit RGB/YCbCr444 (DE-only mode)
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IT66121FN
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，
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:71
44
YCbCr
1st edge
2nd edge
Cb0
Y4
Cb1
Y5
Cb2
Y6
Cb3
Y7
Cb4
Cr0
Cb5
Cr1
Cb6
Cr2
Cb7
Cr3
Y0
Cr4
Y1
Cr5
Y2
Cr6
Y3
Cr7
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
HSYNC
VSYNC
DE
公
司
，
07
55
-3
68
53
28
2
RGB
1st edge
2nd edge
B0
G4
B1
G5
B2
G6
B3
G7
B4
R0
B5
R1
B6
R2
B7
R3
G0
R4
G1
R5
G2
R6
G3
R7
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
HSYNC
VSYNC
DE
Pin Name
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
HSYNC
VSYNC
DE
9
Dual-Edge Triggering with Half Bus Width: use 12-bit RGB/YCbCr444 format as
example
D[23:12]
金
合
D[11:8]
深
圳
市
D[7:4]
D[3:0]
技
Pixel0
Pixel1
Pixel2
...
讯
科
blank
有
限
Table 12. Mappings of 12-bit RGB/YCbCr444 dual-edge triggering (separate syncs)
...
blank
val
G/Ypix0 R/Crpix0 G/Ypix1 R/Crpix1 G/Ypix2 R/Crpix2 G/Ypix3
[3:0]
[7:4]
[3:0]
[7:4]
[3:0]
[7:4]
[3:0]
....
val
val
val
val
B/Cbpix0 R/Crpix0 B/Cbpix1 R/Crpix1 B/Cbpix2 R/Crpix2 B/Cbpix3
[7:4]
[3:0]
[7:4]
[3:0]
[7:4]
[3:0]
[7:4]
....
val
val
val
val
B/Cbpix0 G/Ypix0 B/Cbpix1 G/Ypix1 B/Cbpix2 G/Ypix2 B/Cbpix3
[3:0]
[7:4]
[3:0]
[7:4]
[3:0]
[7:4]
[3:0]
....
val
val
val
PCLK
DE
H/VSYNC
Figure 12. 12-bit RGB/YCbCr444 dual-edge triggering (separate syncs)
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T8720F V0.7.1 Apr-2013 Rev:1.02
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IT66121FN
Dual-Edge Triggering with Half Pixel Clock:
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QQ
:71
，
28
2
有
限
公
YCbCr
Cb0
Cb1
Cb2
Cb3
Cb4
Cb5
Cb6
Cb7
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Cr0
Cr1
Cr2
Cr3
Cr4
Cr5
Cr6
Cr7
HSYNC
VSYNC
DE
07
55
-3
68
53
RGB
B0
B1
B2
B3
B4
B5
B6
B7
G0
G1
G2
G3
G4
G5
G6
G7
R0
R1
R2
R3
R4
R5
R6
R7
HSYNC
VSYNC
DE
，
Pin Name
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
HSYNC
VSYNC
DE
9
Example 1: 24-bit RGB/YCbCr444 with Separate Syncs and Dual-Edge Triggering
Pixel6
...
val
R/Crpix0 R/Crpix1 R/Crpix2 R/Crpix3 R/Crpix4 R/Crpix5 R/Crpix6
....
val
val
val
D[15:8]
val
G/Ypix0 G/Ypix1 G/Ypix2 G/Ypix3 G/Ypix4 G/Ypix5 G/Ypix6
....
val
val
val
D[7:0]
val
B/Cbpix0 B/Cbpix1 B/Cbpix2 B/Cbpix3 B/Cbpix4 B/Cbpix5 B/Cbpix6
....
val
val
val
深
圳
市
金
合
D[23:16]
Pixel0
讯
科
blank
技
Table 13. Mappings of 24-bit RGB/YCbCr444 dual-edge triggering (separate syncs)
Pixel1
Pixel2
Pixel3
Pixel4
Pixel5
blank
PCLK
DE
H/VSYNC
Figure 13. 24-bit RGB/YCbCr444 dual-edge triggering (separate syncs)
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IT66121FN
Example 2: 16/20/24-bit YCbCr422 with Separate Syncs using Dual-Edge Triggering
司
QQ
:71
44
51
81
9
YCbCr 4:2:2 24-bit
1st edge
2nd edge
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
Y8
Y8
Y9
Y9
Y10
Y10
Y11
Y11
Cb0
Cr0
Cb1
Cr1
Cb2
Cr2
Cb3
Cr3
Cb4
Cr4
Cb5
Cr5
Cb6
Cr6
Cb7
Cr7
Cb8
Cr8
Cb9
Cr9
Cb10
Cr10
Cb11
Cr11
HSYNC
HSYNC
VSYNC
VSYNC
DE
DE
07
55
-3
68
53
28
2
，
YCbCr 4:2:2 20-bit
1st edge
2nd edge
grounded
grounded
grounded
grounded
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
Y8
Y8
Y9
Y9
grounded
grounded
grounded
grounded
Cb0
Cr0
Cb1
Cr1
Cb2
Cr2
Cb3
Cr3
Cb4
Cr4
Cb5
Cr5
Cb6
Cr6
Cb7
Cr7
Cb8
Cr8
Cb9
Cr9
HSYNC
HSYNC
VSYNC
VSYNC
DE
DE
，
YCbCr 4:2:2 16-bit
1st edge
2nd edge
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
Y0
Y0
Y1
Y1
Y2
Y2
Y3
Y3
Y4
Y4
Y5
Y5
Y6
Y6
Y7
Y7
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
Cb0
Cr0
Cb1
Cr1
Cb2
Cr2
Cb3
Cr3
Cb4
Cr4
Cb5
Cr5
Cb6
Cr6
Cb7
Cr7
HSYNC
HSYNC
VSYNC
VSYNC
DE
DE
公
Pin Name
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
HSYNC
VSYNC
DE
D[23:12]
金
合
D[11:0]
Pixel0
讯
科
blank
技
有
限
Table 14. Mappings of 16/20/24-bit YCbCr422 dual-edge triggering (separate syncs)
Pixel1
Pixel2
Pixel3
Pixel4
Pixel5
Pixel6
...
blank
val
Cbpix0
Crpix0
Cbpix2
Crpix2
Cbpix4
Crpix4
Cbpix6
....
val
val
val
val
Ypix0
Ypix1
Ypix2
Ypix3
Ypix4
Ypix5
Ypix6
....
val
val
val
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PCLK
DE
H/VSYNC
Figure 14. 16/20/24-bit YCbCr422 dual-edge triggering (separate syncs)
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T8720F V0.7.1 Apr-2013 Rev:1.02
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IT66121FN
Example 3: 8/10/12-bit YCbCr422 with Embedded Syncs using Dual-Edge Triggering
YCbCr 4:2:2 8-bit
YCbCr 4:2:2 10-bit
YCbCr 4:2:2 12-bit
2nd edge
1st edge
2nd edge
1st edge
2nd edge
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
C0
C1
C2
C3
C4
C5
C6
C7
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
C0
C1
C2
C3
C4
C5
C6
C7
C8
C9
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
Y9
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
C0
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y9
Y9
Y10
Y11
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
grounded
81
51
44
QQ
:71
，
28
2
07
55
-3
68
53
，
司
9
1st edge
公
Pin Name
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
HSYNC
VSYNC
DE
有
限
Table 15. Mappings of 8/10/12-bit YCbCr422 dual-edge triggering (embedded syncs)
blank
blank
Pixel0
D[23:16]&[3:0]
FF
00
00
XY
Cbpix0/1
Ypix0
Pixel1
Crpix0/1
Ypix1
Pixel2
Cbpix2/3
Ypix2
...
...
Crpix2/3
....
EAV
FF
00
深
圳
市
PCLK
val
金
合
D[15:4]
讯
科
技
SAV
DE
H/VSYNC
Figure 15. 8/10/12-bit YCbCr422 dual-edge triggering (embedded syncs)
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T8720F V0.7.1 Apr-2013 Rev:1.02
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IT66121FN
System Design Consideration
QQ
:71
44
51
81
9
As a high-performance receiver/transmitter, ITE’s RX/TX is capable of receiving/transmitting those
signals that are attenuated and degraded by the HDMI cables. These signals are usually very small in
amplitudes in addition to the distortion that the cable inflicts on them. The analog front-end of ITE’s
RX/TX is designed to combat environment noises as well as interference to some degree. However, to
get the optimum performance the system designers should follow the guideline below when designing
the application circuits and PCB layout.
 HDMI Differential Signal
The characteristic impedance of all differential PCB traces (RX2P/M, RX1P/M, RX0P/M, and
司
，
07
55
-3
68
53
28
2
，
RXCP/M) should be kept 100_ all the way from the HDMI connector to ITE’s RX/TX. This is very
crucial to the system performance at high speeds. When routing these 4 differential transmission
lines (8 single-ended lines in total), the following guidelines should be followed:
1. The signals traces should be on the outside layers (e.g. TOP layer) while beneath it there
should be a continuous ground plane in order to maintain the called micro-strip structure,
giving stable and well-defined characteristic impedances.
2. Cornering, through holes, crossing and any irregular signal routing should be avoided so as
to prevent from disrupting the EM field and creating discontinuity in characteristic impedance.
3. ITE’s RX/TX should be placed as close to the HDMI connector as possible. Since the TMDS
signal pins of ITE’s RX/TX perfectly match the order of the connector pins, it is very
公
有
限
金
合
5.
讯
科
技
4.
convenient to route the signal directly into the chip, without through holes or angling.
Carefully choose the width and spacing of the differential transmission lines as their
characteristic impedance depends on various parameters of the PCB: trace width, trace
spacing, copper thickness, dielectric constant, dielectric thickness, etc. Careful 3D EM
simulation is the best way to derive a correct dimension that enables nominal 100_
differential impedance. Please contact us directly for technical support of this issue.
The sensitive HDMI differential signals should be taken when routing. To reduce the
深
圳
市
differential unbalanced effect, it is recommended to separate at least 3 times the dielectric
thickness between the signal layer and the reference layer to any other adjacent signal or
GND plane to reduce noise inference and jitter. (or 25 mils is enough space in almost PCB
stack)

ESD Consideration
Special care should be taken when adding discrete ESD devices to all differential PCB traces
(RX2P/M, RX1P/M, RX0P/M, and RXCP/M). ITE’s RX/TX is designed to provide ESD protection
for up to 2kV at these pins. Adding discrete ESD diodes could enhance the ESD capability, but at
the same time will inevitably add capacitive loads, therefore degrade the electrical performance at
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IT66121FN
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:71
44
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9
high speeds. If not chosen carefully, these diodes coupled with less-than-optimal layout would
prevent the system from passing the SINK TMDS-Differential Impedance test in the HDMI
Compliance Test (Test ID 8-8). Besides, most general-purpose ESD diodes are relatively large in
size, forcing the high-speed differential lines to corner several times and therefore introducing
severe reflection. Carefully choosing an ESD diode that's designed for HDMI signaling could lead
to a minimum loading as well as an optimized layout. Commercially available devices such as
Semtech's RClamp0524p that take into consideration of all aspects are recommended. A layout
example is shown in Fig. 16, with referenced FR4 PCB structure included. Note that the ESD
diodes should be placed as close to the HDMI connectors as possible to yield the best ESD
performances.
100ohm differentially
68 67 66 65
，
RClamp0524p
64
28
2
63
62
61
GND
60
07
55
-3
68
53
59
58
57
56
55
54
53
51
50
49
47
EXAMPLE:
44
W
43
S
GND
DATA0CLOCK+
GND
RClamp0524p
41
εr=4.3
40
CEC
SCL
SDA
GND
+5V
1.8mil
8mil
HPD
100 ohm: W=9mil, S=11mil
1.4mil
技
39
CLOCK-
reserved
W
有
限
42
公
45
讯
科
PCB layout example for high-speed transmission lines with RClamp0524p
金
合
Figure 16:
DATA0+
司
46
DATA1+
GND
，
48
GND
DATA2-
DATA1-
GND
52
DATA2+
深
圳
市
Notes: The PCB stack and material will affect differential impedance. The customer shall
co-work with PCB provider to obtain the real 100 ohm impedance based on actual PCB stack
and material.
 Power Supply Bypassing
1. It is recommended to bypass each group of power supply pin with a 0.1µF capacitor.
2. It is also recommended that the bypass capacitor be located within about 0.5cm distance of
each power pin.
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T8720F V0.7.1 Apr-2013 Rev:1.02
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Low ESL
0.01uF
44
Device
51
81
9
IT66121FN
VCC
VCC
QQ
:71
Decoupling
Capacitor
28
2
07
55
-3
68
53
Via to GND
，
VSS
3. Avoid placing the capacitor on the opposite side of the PC board from the HDMI IC.
4. It is recommended to add ferrite beads for analog powers. Ex. PVDD, PVCC, AVDD etc…
High Speed Digital Input/Output Signals(Both Data and Clocks)
司

，
5. Shorter power loop makes better performance.
公
1. To obtain good signal quality and avoid EMI issue, 4-layres PCB stacks are recommended.
有
限
2. Try to minimize the trace length that the digital outputs have to drive.
技
3. Keep these high speed signals refer to a continue GND or power plane, no GND or power slot
break the returning current path.
金
合
讯
科
4. It’s recommended to add a series resistor of value 33 ohm to suppress reflections, reduce
EMI, and reduce the current spikes. These series resistors should be place as close to the
driving pins as possible.
市
5. If possible, try to place ITE’s RX/TX and related “Scalar IC” on the same PCB side and route
these high speed signals not to through vias to get the better signal quality.
深
圳
6. The sensitive clock (PCLK) signals should be taken when routing. To reduce the crosstalk
effect, it is recommended to separate at least 2 times the maximum dielectric thickness
between the signal layer and the reference layer to any other adjacent signal to reduce noise
inference and jitter.
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T8720F V0.7.1 Apr-2013 Rev:1.02
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IT66121FN
深
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金
合
讯
科
技
有
限
公
司
，
07
55
-3
68
53
28
2
，
QQ
:71
44
51
81
9
Package Dimensions
www.ite.com.tw
Figure 17. 64-pin QFN Package Dimensions
T8720F V0.7.1 Apr-2013 Rev:1.02
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