Specifications

OCT Calibration Block in Cyclone V Devices
You can calibrate the OCT using any of the available four OCT calibration blocks for each device. Each
calibration block contains one RZQ pin.
You can use R
S
and R
T
OCT in the same I/O bank for different I/O standards if the I/O standards use the
same V
CCIO
supply voltage. You cannot configure the R
S
OCT and the programmable current strength for
the same I/O buffer.
The OCT calibration process uses the RZQ pin that is available in every calibration block in a given I/O bank
for series- and parallel-calibrated termination:
•
Connect the RZQ pin to GND through an external 100 Ω or 240 Ω resistor (depending on the R
S
or R
T
OCT value).
•
The RZQ pin shares the same V
CCIO
supply voltage with the I/O bank where the pin is located.
Cyclone V devices support calibrated R
S
and calibrated R
T
OCT on all I/O pins except for dedicated
configuration pins.
Calibration Block Locations in Cyclone V Devices
Figure 5-17: OCT Calibration Block and RZQ Pin Location—Preliminary
This figure shows the location of I/O banks with OCT calibration blocks and RZQ pins in the Cyclone V
device.
Calibration block
RZQ pin
RZQ pin
RZQ pin
Bank 8A
Transceiver Block
Bank 7A
Bank 6A
Bank 5BBank 5A
Bank 4A
Bank 3BBank 3A
Sharing an OCT Calibration Block on Multiple I/O Banks
An OCT calibration block has the same V
CCIO
as the I/O bank that contains the block. 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.
Altera Corporation
I/O Features in Cyclone V Devices
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OCT Calibration Block in Cyclone V Devices
CV-52005
2013.06.21