Intel® Stratix® 10 General Purpose I/O User Guide

ID 683518
Date 7/07/2021
Public

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2.4.3. RT OCT with Calibration in Intel® Stratix® 10 Devices

The Intel® Stratix® 10 devices support RT OCT with calibration in all LVDS I/O banks but not in the 3 V I/O banks. RT OCT with calibration is available only for configuration of input and bidirectional pins. Output pin configurations do not support RT OCT with calibration. If you use RT OCT, the VCCIO of the bank must match the I/O standard of the pin where you enable the RT OCT.

Table 12.  Selectable I/O Standards for RTOCT With CalibrationThis table lists the input termination settings for calibrated OCT on different I/O standards.
I/O Standard Calibrated OCT (Input)
RT (Ω) RZQ (Ω)
SSTL-18 Class I 50 100
SSTL-18 Class II 50 100
SSTL-15 Class I 50 100
SSTL-15 Class II 50 100
SSTL-15 48, 60,120 240
SSTL-135 48, 60, 120 240
SSTL-125 48, 60, 120 240
SSTL-12 60, 120 240
POD12 34, 40, 48, 60, 80, 120, 240 240
1.8 V HSTL Class I 50 100
1.8 V HSTL Class II 50 100
1.5 V HSTL Class I 50 100
1.5 V HSTL Class II 50 100
1.2 V HSTL Class I 50 100
1.2 V HSTL Class II 50 100
Differential SSTL-18 Class I 50 100
Differential SSTL-18 Class II 50 100
Differential SSTL-15 Class I 50 100
Differential SSTL-15 Class II 50 100
Differential SSTL-15 48, 60,120 240
Differential SSTL-135 48, 60, 120 240
Differential SSTL-125 48, 60, 120 240
Differential SSTL-12 60, 120 240
Differential POD12 34, 40, 48, 60, 80, 120, 240 240
Differential 1.8 V HSTL Class I 50 100
Differential 1.8 V HSTL Class II 50 100
Differential 1.5 V HSTL Class I 50 100
Differential 1.5 V HSTL Class II 50 100
Differential 1.2 V HSTL Class I 50 100
Differential 1.2 V HSTL Class II 50 100

The RT OCT calibration circuit compares the total impedance of the I/O buffer to the external resistor connected to the RZQ pin. The circuit dynamically enables or disables the transistors until the total impedance of the I/O buffer matches the external resistor.

Calibration occurs at the end of the device configuration. When the calibration circuit finds the correct impedance, the circuit powers down and stops changing the characteristics of the drivers.

Figure 12. RT OCT with Calibration


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