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EP2S130F1020I4 Datasheet, PDF (466/768 Pages) List of Unclassifed Manufacturers – Stratix II Device Handbook, Volume 1 | |||
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On-Chip Termination
The Stratix II and Stratix II GX devices supports I/O driver on-chip series
(RS) and parallel (RT) termination through drive strength control for
single-ended I/Os. There are three ways to implement the RS and (RT) in
Stratix II and Stratix II GX devices:
â RS without calibration for both row I/Os and column I/Os
â RS with calibration only for column I/Os
â RT with calibration only for column I/Os
On-Chip Series Termination without Calibration
Stratix II and Stratix II GX devices support driver impedance matching to
provide the I/O driver with controlled output impedance that closely
matches the impedance of the transmission line. As a result, reflections
can be significantly reduced. Stratix II and Stratix II GX devices support
on-chip series termination for single-ended I/O standards (see
Figure 4â23). The RS shown in Figure 4â23 is the intrinsic impedance of
transistors. The typical RS values are 25ï and 50ï. Once matching
impedance is selected, current drive strength is no longer selectable.
1
On-chip series termination without calibration is supported on
output pins or on the output function of bidirectional pins.
Figure 4â23. Stratix II and Stratix II GX On-Chip Series Termination without
Calibration
Stratix II Driver
Series Impedance
VCCIO
Receiving
Device
RS
ZO
RS
GND
4â28
Stratix II Device Handbook, Volume 2
Altera Corporation
January 2008
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