ADV7191 Analog Devices, ADV7191 Datasheet - Page 38

• Manufacturer Part Number: ADV7191
• Description: Video Encoder with Six 10-Bit DACs and Video Encoder with Six DAC Outputs
• Manufacturer: Analog Devices

ADV7190/ADV7191
CGMS_WSS REGISTER 1 C/W1 (C/W17–C/W10)
(Address (SR4–SR0) = 1AH)
CGMS_WSS Register 1 is an 8-bit-wide register. Figure 70 shows
the operations under control of this register.
C/W1 BIT DESCRIPTION
CGMS/WSS Data (C/W10–C/W15)
These bit locations are shared by CGMS data and WSS data. In
NTSC mode these bits are CGMS data. In PAL mode these bits
are WSS data.
CGMS Data (C/W16–C/W17)
These bits are CGMS data bits only.
CGMS_WSS REGISTER 2
C/W1 (C/W27–C/W20)
(Address (SR4–SR0) = 1BH)
CGMS_WSS Register 2 is an 8-bit-wide register. Figure 71 shows
the operations under control of this register.
C/W2 BIT DESCRIPTION
CGMS/WSS Data (C/W20–C/W27)
These bit locations are shared by CGMS data and WSS data. In
NTSC mode these bits are CGMS data. In PAL mode these bits
are WSS data.
CONTRAST CONTROL REGISTER (CC00–CC07)
(Address (SR4–SR0) = 1DH)
The contrast control register is an 8-bit-wide register used to
scale the Y output levels. Figure 72 shows the operation under
control of this register.
Y Scale Value (CC00–CC07)
These eight bits represent the value required to scale the Y pixel
data from 0.0 to 1.5 of its initial level. The value of these eight
bits is calculated using the following equation:
Example:
Scale Factor = 1.18
Y Scale Value = 1.18 × 128 = 151.04
Y Scale Value = 151 (rounded to the nearest integer)
Y Scale Value = 10010111
Y Scale Value = 97
C/W27
C/W17
C/W17 – C/W16
CGMS DATA
C/W26
C/W16
Y Scale Value = Scale Factor × 128
C/W25
C/W15
h
CGMS/WSS DATA
C/W24
C/W14
C/W27 – C/W20
b
C/W23
CGMS/WSS DATA
C/W13
C/W15 – C/W10
C/W22
C/W12
C/W21
C/W11
C/W20
C/W10
COLOR CONTROL REGISTERS 2–1 (CC2–CC1)
(Address (SR4–SR0) = 1EH–1FH)
The color control registers are 8-bit-wide registers used to scale
the U and V output levels. Figure 73 shows the operations under
control of these registers.
CC1 BIT DESCRIPTION
U Scale Value (CC10–CC17)
These eight bits represent the value required to scale the U level
from 0.0 to 2.0 of its initial level. The value of these eight bits is
calculated using the following equation:
Example:
Scale Factor = 1.18
U Scale Value = 1.18 × 128 = 151.04
U Scale Value = 151 (rounded to the nearest integer)
U Scale Value = 10010111
U Scale Value = 97
CC2 BIT DESCRIPTION
V Scale Value (CC20–CC27)
These eight bits represent the value required to scale the V pixel
data from 0.0 to 2.0 of its initial level. The value of these eight
bits is calculated using the following equation:
Example:
Scale Factor = 1.18
V Scale Value = 1.18 × 128 = 151.04
V Scale Value = 151 (rounded to the nearest integer)
V Scale Value = 10010111
V Scale Value = 97
CC07
CC27
CC17
CC06
CC26
CC16
U Scale Value = Scale Factor × 128
V Scale Value = Scale Factor × 128
CC05
CC25
CC15
h
h
CC04
Y SCALE VALUE
U SCALE VALUE
CC24
V SCALE VALUE
CC14
b
b
CC07 – CC00
CC27 – CC20
CC17 – CC10
CC03
CC23
CC13
CC02
CC22
CC12
CC01
CC21
CC11
CC00
CC20
CC10