Altera Cyclone V Device Handbook page 133

5-36
R OCT with Calibration in Cyclone V Devices
S
Differential 1.5 V HSTL Class II
Differential 1.2 V HSTL Class I
Differential 1.2 V HSTL Class II
SSTL-15
SSTL-135
SSTL-125
HSUL-12
Differential SSTL-15
Differential SSTL-135
Differential SSTL-125
Differential HSUL-12
Driver-impedance matching provides the I/O driver with controlled output impedance that closely matches
the impedance of the transmission line. As a result, you can significantly reduce signal reflections on PCB
traces.
If you select matching impedance, current strength is no longer selectable.
Figure 5-13: R OCT Without Calibration
S
This figure shows the R
Related Information
On-Chip I/O Termination in Cyclone V Devices
R OCT with Calibration in Cyclone V Devices
S
The Cyclone V devices support R
Altera Corporation
I/O Standard
as the intrinsic impedance of the output transistors.
S
Driver
Series Termination
V
CCIO
R
S
R
S
GND
OCT with calibration in all banks.
S
Uncalibrated OCT (Output)
Receiving
Device
Z = 50 Ω
0
on page 5-34
R (Ω)
S
25
50
25
25, 50, 34, 40
34, 40
34, 40
34, 40, 48, 60, 80
25, 50, 34, 40
34, 40
34, 40
34, 40, 48, 60, 80
I/O Features in Cyclone V Devices
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CV-52005
2014.01.10