Datasheet

ADV7194
–39–
REV. A
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 76 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.
C/W17 C/W16 C/W15 C/W14 C/W13 C/W12 C/W11 C/W10
C/W15 – C/W10
CGMS/WSS DATA
C/W17 – C/W16
CGMS DATA
Figure 76. CGMS_WSS Register 1
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 77 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.
C/W27 – C/W20
CGMS/WSS DATA
C/W27 C/W26 C/W25 C/W24 C/W23 C/W22 C/W21 C/W20
Figure 77. CGMS_WSS Register 2
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 78 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:
Y Scale Value = Scale Factor × 128
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
b
Y Scale Value = 97
h
CC07 – CC00
Y SCALE VALUE
CC07 CC06 CC05 CC04 CC03 CC02 CC01 CC00
Figure 78. Contrast Control Register
COLOR CONTROL REGISTERS 1–2 (CC10–CC27)
(Address (SR4–SR0) = 1EH–1FH)
The color control registers are 8-bit-wide registers used to scale
the U and V output levels. Figure 79 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:
U Scale Value = Scale Factor × 128
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
b
U Scale Value = 97
h
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:
V Scale Value = Scale Factor × 128
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
b
V Scale Value = 97
h
CC17 – CC10
U SCALE VALUE
CC17 CC16 CC15 CC14 CC13 CC12 CC11 CC10
CC27 – CC20
V SCALE VALUE
CC27 CC26 CC25 CC24 CC23 CC22 CC21 CC20
Figure 79. Color Control Register