- 您現在的位置：買賣IC網 > PDF目錄385388 > HMP8156A (Intersil Corporation) NTSC/PAL Encoders PDF資料下載
參數資料
| 型號： | HMP8156A |
| 廠商： | Intersil Corporation |
| 英文描述： | NTSC/PAL Encoders |
| 中文描述： | 的NTSC / PAL編碼器 |
| 文件頁數： | 11/34頁 |
| 文件大小： | 256K |
| 代理商： | HMP8156A |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁當前第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁
11
8-Bit BT.656 Format
When BT.656 format is selected, data is latched on each
rising edge of CLK2. Overlay data is latched when the Y
input data is latched. However, the overlay data must arrive
three pixels after its corresponding Y data. The pixel and
overlay input timing is shown in Figure 12.
As inputs, the BLANK, HSYNC, and VSYNC pins are
ignored since all timing is derived from the EAV and SAV
sequences within the data stream. As outputs, BLANK,
HSYNC and VSYNC are output following the rising edge of
CLK2. If the CLK pin is configured as an input, it is ignored. If
configured as an output, it is one-half the CLK2 frequency.
Square pixel operation, overlay processing with internal
mixing, flicker filtering, and SIF mode 2X upsampling are not
supported for the BT.656 input format. Also, the HSYNC,
VSYNC, and BLANK signals must be configured as outputs.
Video Timing Control
Regardless of the input mode, the output video timing of the
HMP8154/HMP8156A is at 50 or 59.94 fields per second
(interlaced). For normal and 2X upscaling modes, the pixel
input timing is at 50 or 59.94 fields per second; with the
flicker filter enabled, the input timing rate is twice as fast. The
output video and pixel input timing is controlled by the
BLANK, HSYNC, VSYNC, FIELD, and CLK2 pins.
HSYNC, VSYNC, and Field Timing
The leading edge of HSYNC indicates the beginning of a
horizontal sync interval. If HSYNC is an output, it is asserted
for about 4.7
μ
s. If HSYNC is an input, it must be active for at
least two CLK2 periods. The width of the horizontal
composite sync tip is determined from the video standard
and does not depend on the width of HSYNC.
The leading edge of VSYNC indicates the beginning of a
vertical sync interval. If VSYNC is an output, it is asserted for
3 scan lines in (M, NSM) NTSC and (M, N) PAL modes or
2.5 scan lines in (B, D, G, H, I, CN) PAL modes. If VSYNC is
an input, it must be asserted for at least two CLK2 periods.
When HSYNC and VSYNC are configured as outputs, their
leading edges will occur simultaneously at the start of an
odd field. At the start of an even field, the leading edge of
VSYNC occurs in the middle of the line.
When HSYNC and VSYNC are configured as inputs, the
HMP8154/HMP8156A provides a programmable HSYNC
window for determining FIELD. The window is specified with
respect to the leading or trailing edge of VSYNC. The edge
is selected in the field control register. When HSYNC is
found inside the window, then the encoder sets FIELD to the
value specified in the field control register.
The HMP8154/HMP8156A provides programmable timing
for the VSYNC input. At the active edge of VSYNC, the
encoder resets its vertical half-line counter to the value
specified by the field control register. This allows the input
and output syncs to be offset, although the data must still be
aligned.
The FIELD signal is always an output and changes state
near each leading edge of VSYNC. The delay between the
syncs and FIELD depends on the encoder’s operating mode
as summarized in Table 6. In modes in which the encoder
uses CLK to gate its inputs and outputs, the FIELD signal
may be delayed 0-12 additional CLK2 periods.
Figure 13 illustrates the HSYNC, VSYNC, and FIELD
general timing for (M, NSM) NTSC and (M, N) PAL. Figure
14 illustrates the general timing for (B, D, G, H, I, CN) PAL. In
the figures, all the signals are shown active low (their reset
state), and FIELD is low during odd fields.
FIGURE 12. PIXEL AND OVERLAY INPUT TIMING - BT.656
Cb 2
Y 2
Cr 2
Y 3
Cb 4
Y 4
CLK2
P8-P15
PIXEL 0
PIXEL 1
OL0-OL2,
M1, M0
"FF"
"00"
BLANK
(OUTPUT)
"00"
"XY"
"10"
PIXEL N-2
PIXEL N-1
"10"
"80"
PIXEL N
TABLE 6. FIELD OUTPUT TIMING
OPERATING MODE
CLK2
DELAY
COMMENTS
SYNC I/O
DIRECTION
BLANK I/O
DIRECTION
Input
Input
148
FIELD lags VSYNC switch-
ing from odd to even.
FIELD lags the earlier of
VSYNC and HSYNC when
syncs are aligned when
switching from even to odd.
Input
Output
138
FIELD lags VSYNC.
Output
Don’t Care
32
FIELD leads VSYNC.
HMP8154, HMP8156A
相關PDF資料 |
PDF描述 |
|---|---|
| HMP8154EVAL1 | NTSC/PAL Encoders |
| HMP8190 | NTSC/PAL Video Encoder |
| HMP8190CN | NTSC/PAL Video Encoder |
| HMP8190EVAL1 | NTSC/PAL Video Encoder |
| HMP8191 | NTSC/PAL Video Encoder |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HMP8156ACN | 功能描述:編碼器、解碼器、復用器和解復用器 64MQFP,0+70C NTSC/PAL VIDEO ENCODER RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| HMP8156ACNZ | 功能描述:編碼器、解碼器、復用器和解復用器 W/ANNEAL 64MQFP 0+70 ENCODER RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| HMP8156CN | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| HMP8156EVAL1 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:NTSC/PAL Encoders |
| HMP8156EVAL2 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
發布緊急采購，3分鐘左右您將得到回復。