Intel® Arria® 10 Core Fabric and General Purpose I/Os Handbook

ID 683461
Date 5/27/2022
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5.5.4.1. RS OCT without Calibration in Intel® Arria® 10 Devices

The Intel® Arria® 10 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)
3.0 V LVTTL/3.0 V LVCMOS GX, SX 25/50
2.5 V LVCMOS GX, SX 25/50
1.8 V LVCMOS All 25/50
1.5 V LVCMOS All 25/50
1.2 V LVCMOS All 25/50
SSTL-18 Class I All 50
SSTL-18 Class II All 25
SSTL-15 Class I All 50
SSTL-15 Class II All 25
SSTL-15 All 34, 40
SSTL-135 All 34, 40
SSTL-125 All 34, 40
SSTL-12 All 40, 60, 120, 240
POD12 All 34, 40, 48, 60
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
HSUL-12 All 34.3, 40, 48, 60, 80
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 SSTL-15 All 34, 40
Differential SSTL-135 All 34, 40
Differential SSTL-125 All 34, 40
Differential SSTL-12 All 40, 60, 120, 240
Differential POD12 All 34, 40, 48, 60
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
Differential HSUL-12 All 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 85. RS OCT Without CalibrationThis figure shows the RS as the intrinsic impedance of the output transistors.


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