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5-20
Programmable Pre-Emphasis
SV51006
2014.01.10
Related Information
? Stratix V Device Datasheet
? Programmable IOE Features in Stratix V Devices on page 5-17
? Stratix V Device Datasheet
Programmable Pre-Emphasis
The V OD setting and the output impedance of the driver set the output current limit of a high-speed
transmission signal. At a high frequency, the slew rate may not be fast enough to reach the full V OD level
before the next edge, producing pattern-dependent jitter. With pre-emphasis, the output current is boosted
momentarily during switching to increase the output slew rate.
Pre-emphasis increases the amplitude of the high-frequency component of the output signal, and thus helps
to compensate for the frequency-dependent attenuation along the transmission line. The overshoot introduced
by the extra current happens only during a change of state switching to increase the output slew rate and
does not ring, unlike the overshoot caused by signal reflection. The amount of pre-emphasis required depends
on the attenuation of the high-frequency component along the transmission line.
Figure 5-3: Programmable Pre-Emphasis
This figure shows the LVDS output with pre-emphasis.
Voltage boost
from pre-emphasis
OUT
V P
V OD
OUT
V P
Differential output
voltage (peak–peak)
Table 5-13: Quartus II Software Assignment Editor — Programmable Pre-Emphasis
This table lists the assignment name for programmable pre-emphasis and its possible values in the Quartus II software
Assignment Editor.
To
Assignment name
Allowed values
Field
Assignment (Default setting in bold)
tx_out
Programmable Pre-emphasis
0 (disabled) and 1 (enabled)
Related Information
Programmable IOE Features in Stratix V Devices on page 5-17
Programmable Differential Output Voltage
The programmable V OD settings allow you to adjust the output eye opening to optimize the trace length
and power consumption. A higher V OD swing improves voltage margins at the receiver end, and a smaller
Altera Corporation
I/O Features in Stratix V Devices
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