
Chapter 3: Functional Description 3–3
Block Description
February 2013 Altera Corporation Serial Digital Interface (SDI) MegaCore Function
User Guide
■ Internal switching between two reference clock signals in the transmitter block.
This feature is optional and only available for Arria II GZ, Stratix IV GX , and
HardCopy IV devices.
Figure 3–2 shows the top-level block diagram for the SDI transmitter.
For HD-SDI, the transmitter accepts 20-bit parallel video data; for SD-SDI, 10-bit
parallel data. For
txdata
bus definition, refer to Table 3–16 on page 3–41.
Figure 3–2. SDI Transmitter Block Diagram
TRS Match
SDI TRANSMITTER
Protocol Block
Transceiver Interface Block
Transceiver Block
LN Insert
CRC (c)
CRC (y)
Scrambler
FIFO
GXB RX Sample
rst_tx
tx_pclk
reset
tx_serial_refclk
tx_serial_refclk1 (optional)
gxb4_cal_clk
sdi_reconfig_togxb[3:0]
sdi_gxb_powerdown
rst_tx
tx_pclk
txdata[19:0]
tx_std[1:0]
tx_trs
tx_ln[21:0]
enable_ln
enable_crc
tx_status
gxb_tx_clkout
sdi_tx (serial data)
sdi_reconfig_fromgxb[16
tx_data[19:0]
tx_clockout
tx_datain[19:0]
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