DK-DEV-5SGXEA7/ES Altera, DK-DEV-5SGXEA7/ES Datasheet - Page 223

• Manufacturer Part Number: DK-DEV-5SGXEA7/ES
• Description: KIT DEV STRATIX V FPGA 5SGXEA7
• Manufacturer: Altera
• Series: Stratix® Vr
• Type: FPGAr

Specifications of DK-DEV-5SGXEA7/ES

• Contents: Board
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• For Use With/related Products: Stratix® V 5SGXEA7
• Other names: 544-2725

Chapter 6: High-Speed Differential I/O Interfaces and DPA in Stratix V Devices
Differential Transmitter
May 2011 Altera Corporation
Programmable Differential Output Voltage (V
Pre-Emphasis
Stratix V LVDS transmitters support programmable pre-emphasis and programmable
V
output signal, and thus helps to compensate for the frequency-dependent attenuation
along the transmission line.
Figure 6–7. Differential V
Figure 6–8
Figure 6–8. Programmable Pre-Emphasis
Note to
(1) V
Pre-emphasis is an important feature for high-speed transmission. Without
pre-emphasis, the output current is limited by the V
impedance of the driver. At high frequency, the slew rate may not be fast enough to
reach full V
OD
. Pre-emphasis increases the amplitude of the high-frequency component of the
P
OUT
OUT
— voltage boost from pre-emphasis. V
Figure
Single-Ended Waveform
Differential Waveform
shows the LVDS output with pre-emphasis.
6–8:
OD
before the next edge, producing pattern-dependent jitter.
V
CM
OD
V
Figure 6–7
OD
V
V
P
P
OD
— differential output voltage (peak-peak).
Stratix V Device Handbook Volume 2: Device Interfaces and Integration
V
OD
(Note 1)
shows the differential LVDS output.
V
V
OD
OD
OD
(diff peak - peak) = 2 x V
) and Programmable
OD
setting and the output
V
OD
Positive Channel (p)
Negative Channel (n)
Ground
p - n = 0V
OD
(single-ended)
6–9