Altera Stratix IV GX FPGA Development Board - Manual (Page 54)

2–46 Chapter 2: Board Components
Components and Interfaces
Stratix IV GX FPGA Development Board, 530 Edition Reference Manual November 2010 Altera Corporation
SDI Video Input/Output
The serial digital interface (SDI) video port consists of a LMH0302SQ cable driver and
a LMH0344 receiver cable equalizer. The PHY devices from National Semiconductor
interface to single-ended 75-
Ω SMB connectors which extends out through the PCI
Express bracket for easy use while installed in a host PC.
The LMH0302SQ driver supports operation at 270 Mbit standard definition (SD),
1.5 Gbit high definition (HD), and 3.0 Gbit dual-link HD modes. Control signals are
allowed for SD and HD modes selections, as well as device enable. The device can be
clocked by the 148.5 MHz voltage-controlled crystal oscillator (VCXO) and matched
to incoming signals within 50 ppm using the UP and DN voltage control lines to the
VCXO.
Table 2–42 shows the supported output standards for the SD and HD input.
Table 2–43 summarizes the SDI video output interface pin assignments. The signal
names and directions are relative to the Stratix IV GX FPGA.
Figure 2–13 shows the SDI cable driver.
Table 2–42. Supported Output Standards for SD and HD Input
SD_HD Input Supported Output Standards Rise TIme
0 SMPTE 424M, SMPTE 292M Faster
1 SMPTE 259M Slower
Table 2–43. SDI Video Output Interface Pin Assignments, Schematic Signal Names, and Functions
Board
Reference
Description
Schematic
Signal Name
I/O Standard
Stratix IV GX Device
Pin Number
U4.1 SDI video output P SDI_TX_P
1.4-V PCML
K4
U4.2 SDI video output N SDI_TX_N K3
U4.6 Device enable SDI_TX_EN
2.5-V
N6
U4.10 High definition select SDI_TX_SD_HDn V29
Figure 2–13. SDI Cable Driver
Differential
Input
V
cc
V cc
ENABLE
LMH0302
1.0 μF 5.6 nH
75 Ω
75 Ω
750 Ω
75 Ω 75 Ω
49.9 Ω
49.9 Ω
1.0 μF
0.1 μF
0.1 μF
4.7 μF
4.7 μF
5.6 nH
SD/HD
SD/HD
SDO
SDO
ENABLE
SDI
SDI R REF