EP2AGX95EF29C6N Datasheet, PDF (190/380 Pages) Altera Corporation – Device Interfaces and Integration

6–26
Chapter 6: I/O Features in Arria II Devices
Arria II OCT Calibration
Arria II OCT Calibration
Arria II GX devices support calibrated R_S OCT and Arria II GZ devices support
calibrated R_S and R_T OCT on all I/O pins. You can calibrate the I/O banks with any of
the OCT calibration blocks available in the device provided the V_CCIO of the I/O bank
with the pins using calibrated OCT matches the V_CCIO of the I/O bank with the
calibration block and its associated RUP and RDN pins.
f For more information about the location of the OCT calibration blocks in Arria II
devices, refer to the Arria II Device Family Connection Guidelines and Arria II Device
Pin-Outs.
OCT Calibration Block
An OCT calibration block has the same V_CCIO as the I/O bank that contains the block.
R_S OCT calibration is supported on all user I/O banks with different V_CCIO voltage
standards, up to the number of available OCT calibration blocks. You can configure
I/O banks to receive calibrated codes from any OCT calibration block with the same
V_CCIO. All I/O banks with the same V_CCIO can share one OCT calibration block, even if
that particular I/O bank has an OCT calibration block.
For example, Figure 6–10 shows a group of I/O banks that has the same V_CCIO
voltage. If a group of I/O banks has the same V_CCIO voltage, you can use one OCT
calibration block to calibrate the group of I/O banks placed around the periphery.
Because banks 3B, 4C, 6C, and 7B have the same V_CCIO as bank 7A, you can calibrate
all four I/O banks (3B, 4C, 6C, and 7B) with the OCT calibration block (CB7) located
in bank 7A. You can enable this by serially shifting out R_S OCT calibration codes from
the OCT calibration block located in bank 7A to the I/O banks located around the
periphery.
1 I/O banks that do not contain calibration blocks share calibration blocks with I/O
banks that do contain calibration blocks.
Arria II Device Handbook Volume 1: Device Interfaces and Integration
December 2011 Altera Corporation