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

ID 683775
Date 10/31/2022
Public
Document Table of Contents

5.5.4.2. RS OCT with Calibration in Intel® Cyclone® 10 GX Devices

The Intel® Cyclone® 10 GX devices support RS OCT with calibration in all LVDS I/O banks.

Table 45.  Selectable I/O Standards for RS OCT With CalibrationThis table lists the output termination settings for calibrated OCT on different I/O standards.
I/O Standard Calibrated OCT (Output)
RS (Ω) RZQ (Ω)
1.8 V LVCMOS 25, 50 100
1.5 V LVCMOS 25, 50 100
1.2 V LVCMOS 25, 50 100
SSTL-18 Class I 50 100
SSTL-18 Class II 25 100
SSTL-15 Class I 50 100
SSTL-15 Class II 25 100
SSTL-15 25, 50 100
34, 40 240
SSTL-135 34, 40 240
SSTL-125 34, 40 240
SSTL-12 40, 60, 120, 240 240
POD12 34, 40, 48, 60 240
1.8 V HSTL Class I 50 100
1.8 V HSTL Class II 25 100
1.5 V HSTL Class I 50 100
1.5 V HSTL Class II 25 100
1.2 V HSTL Class I 50 100
1.2 V HSTL Class II 25 100
HSUL-12 34, 40, 48, 60, 80 240
Differential SSTL-18 Class I 50 100
Differential SSTL-18 Class II 25 100
Differential SSTL-15 Class I 50 100
Differential SSTL-15 Class II 25 100
Differential SSTL-15 25, 50 100
34, 40 240
Differential SSTL-135 34, 40 240
Differential SSTL-125 34, 40 240
Differential SSTL-12 40, 60, 120, 240 240
Differential POD12 34, 40, 48, 60 240
Differential 1.8 V HSTL Class I 50 100
Differential 1.8 V HSTL Class II 25 100
Differential 1.5 V HSTL Class I 50 100
Differential 1.5 V HSTL Class II 25 100
Differential 1.2 V HSTL Class I 50 100
Differential 1.2 V HSTL Class II 25 100
Differential HSUL-12 34, 40, 48, 60, 80 240

The RS OCT calibration circuit compares the total impedance of the I/O buffer to the external reference resistor connected to the RZQ pin and dynamically enables or disables the transistors until they match.

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

Figure 75. RS OCT with CalibrationThis figure shows the RS as the intrinsic impedance of the output transistors.


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