Arria® V Device Handbook: Volume 1: Device Interfaces and Integration

ID 683213
Date 10/18/2023
Public
Document Table of Contents

5.9.2. RS OCT with Calibration in Arria® V Devices

The Arria® V devices support RS OCT with calibration in all 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)
3.3 V LVTTL/3.3 V LVCMOS GZ only 25/50 100
3.0 V LVTTL/3.0 V LVCMOS GX, GT, SX, and ST 25/50 100
2.5 V LVCMOS All 25/50 100
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-2 Class I All 50 100
SSTL-2 Class II All 25 100
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
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
Differential SSTL-2 Class I All 50 100
Differential SSTL-2 Class II All 25 100
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 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
SSTL-15 All 25, 50 100
All 34, 40 240
SSTL-135 All 34, 40 240
SSTL-125 All 34, 40 240
SSTL-12 GZ only 40, 60, 240 240
HSUL-12 All 34, 40, 48, 60, 80 240
Differential SSTL-15 All 25, 50 100
All 34, 40 240
Differential SSTL-135 All 34, 40 240
Differential SSTL-125 All 34, 40 240
Differential SSTL-12 GZ only 40, 60, 240 240
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 106. RS OCT with CalibrationThis figure shows the RS as the intrinsic impedance of the output transistors.