Philips Semiconductors
Multistandard video decoder with adaptive
comb filter and component video input
Preliminary specification
SAA7118
1.6 Audio clock generation
• Generation of a field-locked audio master clock to
support a constant number of audio clocks per video
field
• Generation of an audio serial and left/right (channel)
clock signal.
1.7 Digital I/O interfaces
• Real-time signal port (R port), inclusive continuous
line-locked reference clock and real-time status
information supporting RTC level 3.1 (refer to document
“RTC Functional Specification” for details)
• Bidirectional expansion port (X-port) with half duplex
functionality (D1), 8-bit Y-CB-CR
– Output from decoder part, real-time and unscaled
– Input to scaler part, e.g. video from MPEG decoder
(extension to 16-bit possible)
• Video image port (I-port) configurable for 8-bit data
(extension to 16-bit possible) in master mode (own
clock), or slave mode (external clock), with auxiliary
timing and handshake signals
• Discontinuous data streams supported
• 32-word × 4-byte FIFO register for video output data
• 28-word × 4-byte FIFO register for decoded VBI-data
output
• Scaled 4 : 2 : 2, 4 : 1 : 1, 4 : 2 : 0, 4 : 1 : 0 Y-CB-CR
output
• Scaled 8-bit luminance only and raw CVBS data output
• Sliced, decoded VBI-data output.
1.8 Miscellaneous
• Power-on control
• 5 V tolerant digital inputs and I/O ports
• Software controlled power saving standby modes
supported
• Programming via serial I2C-bus, full read back ability by
an external controller, bit rate up to 400 kbits/s
• Boundary scan test circuit complies with the “IEEE Std.
1149.b1 - 1994”.
2 APPLICATIONS
• PC-video capture and editing
• Personal video recorders (time shifting)
• Cable, terrestrial, and satellite set-top boxes
• Internet terminals
• Flat-panel monitors
• DVD-recordable players
• AV-ready hard-disk drivers
• Digital televisions/scan conversion
• Video surveillance/security
• Video editing/post production
• Video phones
• Video projectors
• Digital VCRs.
3 GENERAL DESCRIPTION
The SAA7118 is a video capture device for applications at
the image port of VGA controllers.
Philips X-VIP is a new multistandard comb filter video
decoder chip with additional component processing,
providing high quality, optionally scaled, video.
The SAA7118 is a combination of a four-channel analog
preprocessing circuit including source selection,
anti-aliasing filter and ADC with succeeding decimation
filters from 27 to 13.5 MHz data rate. Each preprocessing
channel comes with an automatic clamp and gain control.
The SAA7118 combines a Clock Generation Circuit
(CGC), a digital multistandard decoder containing
two-dimensional chrominance/luminance separation by an
adaptive comb filter and a high performance scaler,
including variable horizontal and vertical up and
downscaling and a brightness, contrast and saturation
control circuit.
2001 May 30
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