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

ID 683461
Date 9/29/2022
Public
Document Table of Contents

5.5.4.2. RS OCT with Calibration in Intel® Arria® 10 Devices

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

Table 55.  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 Device Variant Support Calibrated OCT (Output)
RS (Ω) RZQ (Ω)
1.8 V LVCMOS All 25, 50 100
1.5 V LVCMOS All 25, 50 100
1.2 V LVCMOS All 25, 50 100
SSTL-18 Class I All 50 100
SSTL-18 Class II All 25 100
SSTL-15 Class I All 50 100
SSTL-15 Class II All 25 100
SSTL-15 All 25, 50 100
34, 40 240
SSTL-135 All 34, 40 240
SSTL-125 All 34, 40 240
SSTL-12 All 40, 60, 120, 240 240
POD12 All 34, 40, 48, 60 240
1.8 V HSTL Class I All 50 100
1.8 V HSTL Class II All 25 100
1.5 V HSTL Class I All 50 100
1.5 V HSTL Class II All 25 100
1.2 V HSTL Class I All 50 100
1.2 V HSTL Class II All 25 100
HSUL-12 All 34, 40, 48, 60, 80 240
Differential SSTL-18 Class I All 50 100
Differential SSTL-18 Class II All 25 100
Differential SSTL-15 Class I All 50 100
Differential SSTL-15 Class II All 25 100
Differential SSTL-15 All 25, 50 100
34, 40 240
Differential SSTL-135 All 34, 40 240
Differential SSTL-125 All 34, 40 240
Differential SSTL-12 All 40, 60, 120, 240 240
Differential POD12 All 34, 40, 48, 60 240
Differential 1.8 V HSTL Class I All 50 100
Differential 1.8 V HSTL Class II All 25 100
Differential 1.5 V HSTL Class I All 50 100
Differential 1.5 V HSTL Class II All 25 100
Differential 1.2 V HSTL Class I All 50 100
Differential 1.2 V HSTL Class II All 25 100
Differential HSUL-12 All 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 86. RS OCT with CalibrationThis figure shows the RS as the intrinsic impedance of the output transistors.


Did you find the information on this page useful?

Characters remaining:

Feedback Message