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Visible to Intel only — GUID: xkb1488175176970
Ixiasoft
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.
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.