参数资料
型号: IP-SDI
厂商: Altera
文件页数: 135/140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
C. Receive and Retransmit
You cannot reuse the HD and 3G recovered clocks for transmitting because the
transmitter jitter is then entirely dependent on the input jitter and jitter transfer
function.
The general recommended approach to system locking with the SDI MegaCore
function is to use a voltage-controlled crystal oscillator (VCXO) external to the device.
The VCXO must be locked to the receiver clock out of the SDI MegaCore function. The
SDI MegaCore function then uses the clean VCXO output as the transmit clock.
Loopback FIFO Buffer
For more efficient transmission, place a FIFO or buffer between the receiver clock
domain logic and the transmit clock domain logic. The decoded receiver data is
connected to the transmitter input through a FIFO buffer. When the receiver is locked,
the logic writes the receiver data to the FIFO buffer. When the FIFO is half full, the
transmitter starts reading, encoding and transmitting the data.
Figure C–1 shows the clocking scheme of the received and retransmitted data.
Figure C–1. Receive and Retransmit
SDI Receiver
FIFO
SDI Transmitter
rx_data
data
q
tx_data
sdi_out
sdi_in
rx_clk
wrclk
rdclk
tx_clk
gxb_clkout
refclk
XTAL
PFD
CTRL
refclk
VCXO
February 2013
Altera Corporation
Serial Digital Interface (SDI) MegaCore Function
User Guide
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