cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 94

• Manufacturer Part Number: cx25870
• Description: Video Encoder With Adaptive Flicker Filtering And Hdtv Output
• Manufacturer: Conexant Systems, Inc.

1.0 Functional Description
1.3 Device Description
1-78
any embedded syncs. For each output, the difference between the peak value
(pure white) and blanking level is 0.7 V (± 3 dB). Therefore, the blanking level
will reside at GND (0 mV) and the maximum level is 700 mV for RGB. The
HSYNC* and VSYNC* digital inputs received by the CX25870/871 continue to
act as a trigger to start a new line and new frame respectively as is the case with
Composite and SVHS outputs. The RGB signals are blanked in accordance with
the values contained in the H_BLANKO and V_BLANKO registers, with
H_CLKO and H_ACTIVE playing a lesser role.
RGB amplitudes are generated when the CX25870’s SCART outputs each ‘see’
an equivalent impedance of 37.5
in the following manner:
Table 1-25. Default SCART Outgoing Signal Assignments
NOTE:
governing the SCART interface.
transmission of SCART RGB/CVBS video with this Conexant device.
68 = DACA
70 = DACB
72 = DACC
66 = DACD
The RGB primary color signals generated in SCART mode will not contain
The primary color signals expect a 75
By default, the RGB positive-going signals are transmitted from the CX25870
Other major characteristics of the CX25870/871 SCART Output Mode are:
• Acceptable digital RGB inputs include 24/16/or 15 bits per pixel
• Acceptable digital YCrCb inputs include 24/16 bits per pixel multiplexed
• CX25870 can operate in master, pseudo-master, or slave interface.
• Pixel sampling rate in this mode is determined based on the incoming and
• DAC resolution for all DACs = 10-bits.
• Red/Green/Blue/Composite SCART Output from CX25870/871 limited to
• Y/C SCART output OK to a maximum active resolution of 1024 x 768.
• Compliance with the European EN50-049 SCART connector standard.
• Compliance with the CEI IEC Publication 933-1 standard. Blue should be
The CX25870 is compliant with the major standards and technical reports
Pin # on CX25870/871
Video[0-3] can be routed out of any of the 4 on-chip DACs by adjusting
the appropriate OUT_MUXA/B/C/D[1:0] bits.
multiplexed or nonmultiplexed, noninterlaced RGB.
or nonmultiplexed, noninterlaced YCrCb.
outgoing clock frequencies (CLKI and CLKO).
a max active resolution of 800 x 600.
Blue should be received as Pin #7, Green as Pin #11, Red as Pin #15, and
CVBS Out from the CX25870 as Composite Out at Pin #19 (Display Side
of Connector).
received as Pin #7, Green as Pin #11, Red as Pin #15, and CVBS Out from
the CX25870 as Composite Out at Pin #19 (Display Side of Connector).
Conexant
Flicker-Free Video Encoder with Ultrascale Technology
Table 1-26
"
Video[0] = Red Primary Color
Video[1] = Green Primary Color
Video[2] = Blue Primary Color
Video[3] = PAL-BDGHI Composite
between the source and destination.
"
load from the display device. Correct
summarizes the pins to be used for
SCART Output
CX25870/871
100381B