EP2AGX45DF29I5 Altera, EP2AGX45DF29I5 Datasheet - Page 409

• Manufacturer Part Number: EP2AGX45DF29I5
• Description: IC ARRIA II GX FPGA 45K 780FBGA
• Manufacturer: Altera
• Series: Arria II GXr

Specifications of EP2AGX45DF29I5

• Number Of Logic Elements/cells: 42959
• Number Of Labs/clbs: 1805
• Total Ram Bits: 3435
• Number Of I /o: 364
• Voltage - Supply: 0.87 V ~ 0.93 V
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 100°C
• Package / Case: 780-FBGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Number Of Gates: -

Chapter 1: Transceiver Architecture in Arria II Devices
Receiver Channel Datapath
December 2010 Altera Corporation
Programmable Common Mode Voltage
The Arria II GX and GZ receivers have on-chip biasing circuitry to establish the
required common mode voltage at the receiver input that supports two common
mode voltage settings of 0.82 V and 1.1 V. You can select the voltage in the ALTGX
MegaWizard Plug-In Manager. For the I/O standards supported by each common
mode voltage setting, refer to
This feature is effective only if you use programmable OCT for the receiver input
buffers as well. If you use external termination, you must implement off-chip biasing
circuitry to establish the common mode voltage at the receiver input buffer.
AC and DC Coupling
A high-speed serial link can either be AC-coupled or DC-coupled, depending on the
serial protocol implementation. Most of the serial protocols require links to be
AC-coupled, protocols similar to SONET optionally allow DC coupling.
In an AC-coupled link, the AC-coupling capacitor blocks the transmitter DC common
mode voltage. The on-chip receiver termination and biasing circuitry automatically
restores the selected common mode voltage. AC-coupled links are required in GIGE,
PCIe, Serial RapidIO, SDI, and XAUI protocols.
Figure 1–25
Figure 1–25. AC-Coupled Link
In a DC-coupled link, the transmitter DC common mode voltage is seen unblocked at
the receiver input buffer. The link common mode voltage depends on the transmitter
common mode voltage and the receiver common mode voltage. The on-chip or
off-chip receiver termination and biasing circuitry must ensure compatibility between
the transmitter and the receiver common mode voltage.
TX Termination
Transmitter
shows an AC-coupled link.
V
TX
CM
Table
Transmission Medium
Transmission Medium
1–6.
AC-Coupling
AC-Coupling
Capacitor
Capacitor
Arria II Device Handbook Volume 2: Transceivers
V
RX
CM
RX Termination
Receiver
1–23