參數(shù)資料
型號(hào): BU1425AK
廠商: Rohm CO.,LTD.
英文描述: NTSC / PAL digital RGB encoder
中文描述: 的NTSC / PAL編碼器,數(shù)字RGB
文件頁(yè)數(shù): 25/32頁(yè)
文件大?。?/td> 307K
代理商: BU1425AK
25
Multimedia ICs
BU1425AK / BU1425AKV
2. Even timing
The BU1425AK / AKV distinguishes whether the condi-
tions of each field (each time that VSY is input) are odd
or otherwise, and internal operation is carried out based
on that recognition after the data is input. As a result,
HSY and VSY are input under input conditions appropri-
ate to the specified mode, enabling regulated output for
the first time. Timing that does not match the odd field
conditions is recognized as an even field. In order to pre-
vent malfunctioning of the internal HSY counter, howev-
er, there are regulations which apply to the timing at
which VSYNC is input in even fields.
Expanded view
HSY
VSY
HSY
T = 1 / Fhsync
T = 1 / Fhsync
1 / 2
T = 1 / Fhsync
1 / 2
The middle of HSY
Tvl
VSY
Thvdiff
Fig. 19 Even conditions
Table 18: Even conditions
Parameter
Symbol
Max.
Typ.
Min.
Tvl
128
VSY input L interval
Thvdiff
Unit
BCLK
BCLK
HSY Falling edge
– 128clk
The middle of HYS
– 128clk
VSY Delay from The
middle of HSY
BCLK = One cycle of internal clock
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