参数资料
型号: IP-SDI
厂商: Altera
文件页数: 53/140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
Chapter 3: Functional Description
Block Description
Figure 3–12 shows the receiver clocks for different video standards.
Figure 3–12. Receiver Clocks
SD-SDI
3–23
Serial Data
SDI MegaCore
Function
rx_clk = 67.5 or 74 MHz
rx_data_valid_out
rx_clk
rx_data
V
V
V
V
rx_data_valid_out
67.5 MHz
HD-SDI
Serial Data
SDI MegaCore
Function
rx_clk = 74.175 or 74.25 MHz
rx_data_valid_out
rx_clk
rx_data
V
V
V
V
rx_data_valid_out
74.25 or 74.175 MHz
3G-SDI or Dual Standard or Triple Standard
Serial Data
SDI MegaCore
Function
rx_clk = 148.5 MHz (or 74.xx MHz when receiving HD)
rx_data_valid_out
148.5 MHz
Transmitter Transceiver Interface
Altera provides a transceiver interface, which interfaces the transceiver to the SDI
function. The transceiver interface implements the following functions:
Retiming from the parallel video clock domain to the transceiver transmitter clock
domain
Optional two-times oversampling for HD
Transmitter oversampling for SD
Transmitter Retiming
The txdata parallel data input to the transceiver must be synchronous and phase
aligned to the tx_coreclk transceiver clock input. SD-SDI (and optionally HD-SDI)
requires a retiming function, because of the oversampling logic. The transmitter uses a
small 16 × 20 FIFO buffer for the retiming.
For HD-SDI, the FIFO buffer realigns the parallel video input to the transceiver
tx_coreclk clock. It is written on every tx_pclk clock, and read on every tx_coreclk .
February 2013
Altera Corporation
Serial Digital Interface (SDI) MegaCore Function
User Guide
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