Arria® V Device Handbook: Volume 1: Device Interfaces and Integration

ID 683213
Date 10/18/2023
Public
Document Table of Contents

5.9.1. RS OCT without Calibration in Arria® V Devices

The Arria® V devices support RS OCT for single-ended and voltage-referenced I/O standards. RS OCT without calibration is supported on output only.

Table 54.  Selectable I/O Standards for RS OCT Without CalibrationThis table lists the output termination settings for uncalibrated OCT on different I/O standards.
I/O Standard Device Variant Support Uncalibrated OCT (Output)
RS (Ω)
3.3 V LVTTL/3.3 V LVCMOS GZ only 25/50
3.0 V LVTTL/3.0 V LVCMOS GX, GT, SX, and ST 25/50
2.5 V LVCMOS All 25/50
1.8 V LVCMOS All 25/50
1.5 V LVCMOS All 25/50
1.2 V LVCMOS All 25/50
SSTL-2 Class I All 50
SSTL-2 Class II All 25
SSTL-18 Class I All 50
SSTL-18 Class II All 25
SSTL-15 Class I All 50
SSTL-15 Class II All 25
1.8 V HSTL Class I All 50
1.8 V HSTL Class II All 25
1.5 V HSTL Class I All 50
1.5 V HSTL Class II All 25
1.2 V HSTL Class I All 50
1.2 V HSTL Class II All 25
Differential SSTL-2 Class I All 50
Differential SSTL-2 Class II All 25
Differential SSTL-18 Class I All 50
Differential SSTL-18 Class II All 25
Differential SSTL-15 Class I All 50
Differential SSTL-15 Class II All 25
Differential 1.8 V HSTL Class I All 50
Differential 1.8 V HSTL Class II All 25
Differential 1.5 V HSTL Class I All 50
Differential 1.5 V HSTL Class II All 25
Differential 1.2 V HSTL Class I All 50
Differential 1.2 V HSTL Class II All 25
SSTL-15 GZ only 25, 34, 40, 50
SSTL-135 GZ only 34, 40
SSTL-125 GZ only 34, 40
SSTL-12 GZ only 40, 60, 240
HSUL-12 GZ only 34.3, 40, 48, 60, 80

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 105. RS OCT Without CalibrationThis figure shows the RS as the intrinsic impedance of the output transistors.