CXM4017R
CXM4018R |
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* Support for 24-bit full-color QVGA, VGA,
WVGA, SVGA, and XGA display formats
* Includes copyright protection technology
(HDCP) and built-in GVIF-HDCP keys (DVD-CCA*2 approved)
* Transmitter (CXM4017R): built-in PLL synthesizer
and differential cable driver circuits
* Receiver (CXM4018R): built-in clock and
data recovery PLL and adaptive cable
equalizer circuits
* CMOS logic interface
* Dual 2.5 V/3.3 V power supplies, low power
consumption
* LQFP 100-pin packages
* Allows existing GVIF cables to be used
without change
*2 DVD-CCA: DVD Copy Control Association |
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The CXM4017R and CXM4018R comprise
an HDCP compliant chipset for serial
transmission of 24-bit full-color digital
video in the QVGA, VGA, WVGA,
SVGA, and XGA formats. Figure 1 shows
the block diagrams of the CXM4017R and
CXM4018R. The CXM4017R is a transmitter
IC that includes encoder, parallel-to-serial converter, and cable driver functions.
The CXM4018R is a receiver IC
that includes cable equalizer, serial-to-parallel
converter, and decoder functions.
The CXM4017R and CXM4018R ICs include
embedded HDCP-Cipher technology
and HDCP keys required to support HDCP
copyright protected transmission. Using
HDCP technology, GVIF is uniquely
suited for use in automotive entertainment
systems based on emerging and increasingly
popular digital formats, including
DVD and digital TV. Figures 2 and 3 show
application and connection examples for
the CXM4017R and CXM4018R. |
 Features of GVIF
Transmission |
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GVIF combines 24-bit video display data,
a 2-bit sync data (HSYNC/VSYNC), 2-bit
control data (DE/AUX) and authentication
data. This serialized data is all delivered
over a low amplitude differential signal at
speeds of 240 to 1950 Mbps. This can all
be achieved using a single shielded twisted
pair (STP) cable with 100 Ω impendence.
The unique GVIF coding provides DC
balance which allows transmitted data
stably. Multiple panel resolutions are supported
using the automatic frequency negotiation
feature (SFTCLK: 8 to 65 MHz). |
| Authentication Over the
Same Differential Pair Cable |
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In copyright protected transmission, a signal
encrypted by the transmission IC is
decrypted by the reception IC. To maintain
the integrity of the protection, the
transmitting master device must determine
(authenticate) whether or not the receiving
slave device is appropriate to receive
the data. This digital handshake is
achieved by utilizing a unique Sony technology
to superpose an authentication signal
of up to 400 Kbps from the receiver
IC to the transmitter IC over a single differential
pair cable. Existing GVIF cables
can be used as is with no modification. |
| Built-in Cable Driver and
Cable Equalizer Circuits |
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The CXM4017R includes a low-voltage
differential signal cable driver circuit and
the CXM4018R includes an adaptive cable
equalizer circuit. Since the cable equalizer
automatically compensates the cable attenuation
characteristics, the application
designers can freely select any cable length
up to 10 meters.
Figure 4 shows the serial data eye pattern
before and after the CXM4018R cable
equalizer circuit. |
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•••• Mr. TAKESHITA••••
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Japan will switch over completely
to digital for terrestrial broadcasting
in 2011. And the Blu-ray Disc
is rapidly gaining popularity. Now
that technologies that transmit
high-definition video data without
degradation directly in its digital
form are desired, GVIF is the only
technology that can transmit 2
Gbps serial signals over just a
single differential pair cable and
furthermore provides copyright
protection functions. I believe that
in the near future GVIF will be deployed
in all car models to make
car life an even more fulfilling experience. |
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See
all articles with figures and tables.  |
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Vol.49 |
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