SUB ADDRESS = 50H BIT NO. FUNCTION DES" />
參數(shù)資料
型號(hào)： HMP8117CNZ
廠商： Intersil
文件頁(yè)數(shù)： 31/45頁(yè)
文件大?。?/td> 0K
描述： IC VIDEO DECODER NTSC/PAL 80PQFP
標(biāo)準(zhǔn)包裝： 66
類(lèi)型： 視頻解碼器
應(yīng)用： 視頻
電壓 - 電源，模擬： 4.75 V ~ 5.25 V
電壓 - 電源，數(shù)字： 4.75 V ~ 5.25 V
安裝類(lèi)型： 表面貼裝
封裝/外殼： 80-BQFP
供應(yīng)商設(shè)備封裝： 80-QFP（14x20）
包裝： 托盤(pán)
37
FN4643.4
July 29, 2009
TABLE 62. PROGRAMMABLE FRACTIONAL GAIN
SUB ADDRESS = 50H
BIT
NO.
FUNCTION
DESCRIPTION
RESET
STATE
7-6
Reserved
Set to 00B for proper operation.
00B
5
Select PFG Enable
Set to “1” to enable the recommended PFG value in bits 4-0 below.
0B
(Use 1B)
4-0
PFG
Programmable Fractional Gain (PFG). When enabled by bit 5, changes the loop gain (response
time) of the AGC logic. Slower values provide some noise immunity to input signals with poor
sync/back-porch characteristics. Recommend using the slowest PFG value of 00001B for
optimum performance. (Thus the recommended 8-bit register value = 21H).
The 5-bit PFG value has a fractional representation as: 20. 2-1 2-2 2-3 2-4
Sample PFG values:
00000B: Gain = 0.0000 (freezes AGC at current value)
00001B: Gain = 0.0625 (slowest AGC response time -- recommended PFG)
01100B: Gain = 0.7500 (default)
10000B: Gain = 1.0000
11111B: Gain = 1.9375 (fastest AGC response time -- not recommended)
01100B
(Use 01H)
TABLE 63. MV STRIPE GATE
SUB ADDRESS = 51H
BIT
NO.
FUNCTION
DESCRIPTION
RESET
STATE
7-6
Reserved
Set to 00B for proper operation.
00B
5-0
MV Stripe Gate
Defines the start of the gate for MV Color Stripe detection in 4xFSC counts. The gate should start
prior to the chroma burst. Default value of 010100B (14H) is valid for NTSC. Recommend
100000B (20H) for PAL.
010100B
TABLE 64. RESERVED
SUB ADDRESS = 52H
BIT
NO.
FUNCTION
DESCRIPTION
RESET
STATE
7-0
Reserved
Set bit 5 to “1” for optimum performance.
02H
(Use 22H)
TABLE 65. AGC HYSTERESIS
SUB ADDRESS = 53H
BIT
NO.
FUNCTION
DESCRIPTION
RESET
STATE
7-4
Defines the amount of hysteresis in the AGC logic. Larger hysteresis values stabilize the AGC
with poor quality input signals. For example:
0000B = No Hysteresis
1000B = Default Hysteresis
1111B = Maximum Hysteresis (Recommended hysteresis value)
1000B
(Use F0H)
3-0
Reserved
Set to 0000B for proper operation.
0000B
TABLE 66. DEVICE REVISION
SUB ADDRESS = 7FH
BIT
NO.
FUNCTION
DESCRIPTION
RESET
STATE
7-0
Device Revision
This 8-bit register specifies the device revision number. Data written to this read-only register is
ignored. The production baseline revision number is 01H.
01H
HMP8117
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