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Chapter 2 — Decoder Command Set Guide
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DECODER Command (45h)
002A IIC Data:
Used after command 0x29 has been issued. Data to be written
is specified in the 32-bit data field. On a “Register Write” command, the decoder
will write the value supplied in the lower byte (in byte 7) of 32-bit data into the
device and register specified in command 0029h.
Digital Video Encode Adjustments
Adjustments can be made to the composite video output by changing register val-
ues within the Philips SAA7121 NTSC/PAL video encoder. Consult Philips
Semiconductor SAA7121 Data sheet for the “SAA7120; SAA7121 Digital Video
Encoder (ConDENC)” dated 1997 Jan 06, for complete register definition and bit
definition. Video adjustments require the use of decoder command 0x0029 and
0x002A.
Provided adjustments:
• Chrominance Phase (Register 0x5A)
• Gain U (Register 0x5B)
• Gain V (Register 0x5C)
• Black Level (Register 0x5D)
• Blank Level (Register 0x5E)
The 0029/002A commands only provide write access to the SAA7121 registers,
register values cannot be read back. Only one status byte can be read back.
The register values must be reloaded after the following events:
• Power is cycled.
• SCSI Reset or Bus Device Reset occurred.
• Changed between different video standards (PAL/NTSC)
Chrominance Phase (Register 0x5a):
Phase of encoded color subcarrier (in-
cluding burst) relative to horizontal sync. Can be adjusted in steps of 360/256 de-
grees.
Gain U (0x5B):
Variable gain for Cb signal; output subcarrier of U contribution,
input representation in accordance with “CCIR 601."
Gain V (0x5C):
Variable gain for Cr signal; output subcarrier of V contribution,
input representation in accordance with “CCIR 601."
Black Level (0x5d):
Variable black level; input representation is in accordance
with CCIR-601 standard.
Blank Level (0x5e):
Variable blanking level.
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