参数资料
型号: IP-SDI
厂商: Altera
文件页数: 92/140页
文件大小: 0K
描述: IP VIDEO INTERFACE - SDI
标准包装: 1
系列: *
类型: MegaCore
功能: 视频系统用串行数字接口
许可证: 初始许可证
4–4
Chapter 4: SDI Audio IP Cores
SDI Audio Embed MegaCore Function
Signals
Table 4–2 lists the general input and output signals for the SDI Audio Embed
MegaCore function.
Table 4–2. General Input and Output Signals
reset
Signal
Width
[0:0]
Direction
Input
Description
This signal resets the system.
This signal provides the frequency reference used when
detecting the difference between video standards using 1 and
1/1.001 clock rates. If its frequency is 0, the signal only
fix_clk
[0:0]
Input
detects either one of the clock rates.
The core limits the possible frequencies for this signal to
24.576 MHz, 25 MHz, 50 MHz, 100 MHz, and 200 MHz. Set
the required frequency using the Frequency of fix_clk
parameter.
If you set the Frequency of fix_clk parameter to 0, you must
drive this signal high to detect a video frame rate of 1/1.001
vid_std_rate
[0:0]
Input
and low to detect a video frame rate of 1. For other settings of
the Frequency of fix_clk parameter, the core automatically
detects these frame rates and drives this signal low.
The 48 kHz output clock that is synchronous to the video.
vid_clk48
[0:0]
Output
This clock signal is only available when you turn on the
Frequency Sine Wave Generator or Include Clock
parameter.
Table 4–3 lists the video input and output signals for the SDI Audio Embed
MegaCore function.
Table 4–3. Video Input and Output Signals (Part 1 of 2)
Signal
Bits
Direction
Description
The video clock that is typically 27 MHz for SD-SDI,
vid_clk
[0:0]
Input
74.25 MHz or 74.17 MHz for HD-SDI, or 148.5 MHz
or 148.35 MHz for 3G-SDI standards. You can use
higher clock rates with the vid_datavalid signal.
Set this signal to indicate the following formats:
[00] for10-bit SD-SDI
vid_std
[1:0]
Input
[01] for 20-bit HD-SDI
[10] for 3G-SDI Level B
[11] for 3G-SDI Level A
vid_datavalid
[0:0]
Input
Assert this signal when the video data is valid.
Serial Digital Interface (SDI) MegaCore Function
User Guide
February 2013 Altera Corporation
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