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IBM
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IBM39ENV420

(IBM39ENV420 / IBM39ENV422) eNV SD Digital Video Encoders



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IBM39ENV420 pdf
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Summary Data Sheet
Features
Profiles and standards
• 4:2:2 Profile at Main Level
• Main Profile at High Level
• Main profile at Main Level
• Simple Profile at Main Level
Image resolutions
• Up to 720x512x30 Fps NTSC
www.DataSheet4U.com• Up to 720x608x25 Fps PAL
Input image pre-processing
• Horizontal noise filter
• Vertical noise filter
• Temporal filter
• Supports horizontal image scaling
• Supports 4:2:2 to 4:2:0 chroma conversion
Compression Options
• 4:2:2 or 4:2:0 output chroma format
• Supports field or frame encoding
• Variable GOP structure
• External reference rate control
• Supports dynamically variable parameters
IBM39eNV422
IBM39eNV420
eNV SD Digital Video Encoders
• Supports MPEG-2 or ATSC user data insertion
• Minimum encoding latency
• Supports up to +/- 200H and +/- 128V search
range
• Programmable quantization tables
Output
• Selectable ES or PES output format
• Produces up to 50 Mbps
Memory
• Single SDRAM memory interface
• Requires a minimum 8 MB of 125 MHz SDRAM
• Supports 2 bank and 4 bank memory chips
Technology
• 3.3V and 2.5V power supplies
• 1.6W nominal power dissipation
• IBM CMOS SA-12E (0.18µm) process technol-
ogy
• 35 mm HPBGA package
Description
The IBM eNV SD video encoder chip offers flexibility
and provides a compact solution for your SD appli-
cation. The chip supports both MPEG-1 and MPEG-
2 real-time encoding. It handles multiple profiles and
levels including 4:2:2 Profile at Main Level and can
encode picture resolutions up to 720x512 and
720x608 in NTSC and PAL, respectively.
The architecture offers a wide range of capability to
encode SD images. The chip can compress images
into either MPEG-2 4:2:2 profile for professional
applications or Main profile for broadcast applica-
tions. It can deliver 4:2:2 or 4:2:0 chroma output for-
mat. The user can program a search range of up to
+/-200H and +/-128V based on their application
needs.
The chip outputs up to 50 Mbps with superior image
quality, making it desirable for high quality, high bit
rate solutions.
The programmable on-chip noise reduction filter
provides an effective solution to achieve the best
image quality at lower bit rates, making a highly
desirable choice for broadcast and distribution appli-
cations requiring VBR and statistical-multiplexing.
Dynamic changing of encoding parameters such as
GOP structure, bit rate control, and search range in
real time provides added flexibility to optimize pic-
ture quality at the available bandwidth.
eNVSD_sds_091301.fm.02
Sept. 13, 2001
Features
1 of 6



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IBM39ENV420 pdf
IBM39eNV422
IBM39eNV420
eNV SD Digital Video Encoders
Block Diagram
Pixel
www.DataSheet4U.comData
27 MHz
Pixel
Interface
Phase
Lock
Loop
External Memory
SDRAM Control
DCT/IDCT
ME Q/IQ
VLE
External
Processor
Host
Interface
Processor
Output
Interface
Bit Stream
Fig. 1. eNV Block Diagram
Pixel Interface
The Pixel Interface supports user selectable CCIR 656 (8-bit) or CCIR 601(16-bit) operation. A 27 MHz pixel
clock is used for CCIR 656 format. It also supports a clock rate of up to 13.5 Mhz clock for the CCIR 601 (16-
bit) mode. This interface is designed to accept pixel data upon completion of the initialization process after
power-on reset.
Phase Lock Loop
The Phase Lock Loop (PLL) takes as input the 27 MHz reference clock, divides it into the system clock rate,
and provides synchronized clock pulses to the entire chip.
Host Interface
Connected to an external processor, the Host Interface communicates user input encoding parameters to the
system through a 16-bit data bus and 8-bit address bus. Data is entered via register writes or via dedicated
Picture and GOP stacks. The Host Interface also offers a means of inputting certain commands to the
encoder’s processor by mailbox, and the reading of select system registers for status and checking.
Block Diagram
2 of 6
eNVSD_sds_091301.fm.02
Sept. 13, 2001



Part Number IBM39ENV420
Description (IBM39ENV420 / IBM39ENV422) eNV SD Digital Video Encoders
Maker IBM - IBM
Total Page 6 Pages
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IBM39ENV420 (IBM39ENV420 / IBM39ENV422) eNV SD Digital Video Encoders IBM39ENV420
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