參數(shù)資料
型號: EVAL-ADV7173EBZ
廠商: Analog Devices Inc
文件頁數(shù): 32/60頁
文件大小: 0K
描述: BOARD EVALUATION FOR ADV7173
標準包裝: 1
系列: Advantiv®
主要目的: 視頻,視頻處理
嵌入式:
已用 IC / 零件: ADV7173
主要屬性: NTSC/PAL 數(shù)字視頻編碼器
次要屬性: I²C 接口
已供物品:
REV. B
ADV7172/ADV7173
–38–
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 61 shows
the operations under control of this register.
C/W1 BIT DESCRIPTION
CGMS/WSS Data (C/W15–C/W10)
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 Only (C/W17–C/W16)
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 62
shows the operations under control of this register.
C/S BIT DESCRIPTION
CGMS/WSS Data (C/W27–C/W20)
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 (CC07–CC00)
(Address (SR4–SR0) = 1DH)
The contrast control register is an 8-bit-wide register used to
scale the Y output levels. Figure 63 shows the operations under
control of this register.
CC0 BIT DESCRIPTION
Reserved (CC07–CC06)
A Logic “0” must be written to these bits.
Y Scalar Value (CC05–CC00)
These six bits represent the value required to scale the Y pixel
data from 0.75 to 1.25 of its initial level. The value of these six
bits is calculated using the following equation:
Contrast Control Register = (X –0.785)
× 128
where X = Scaling factor for Y
e.g., Scale Y by 0.9
Contrast Control Register = (0.9–0.75)
× 128 = 19.2 = 010011
(rounded to the nearest integer)
Actual scaling factor = 0.898.
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 61. CGMS_WSS Register 1
C/W27
C/W26
C/W25
C/W24
C/W23
C/W22
C/W21
C/W20
C/W27–C/W20
CGMS/WSS DATA
Figure 62. CGMS_WSS Register 2
CC07
CC06
CC05
CC04
CC03
CC02
CC01
CC00
CC05–CC00
Y SCALAR VALUE
CC07–CC06
ZERO SHOULD
BE WRITTEN
TO THESE BITS
Figure 63. Contrast Control Register
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