EP2AGX65DF29I5N Altera, EP2AGX65DF29I5N Datasheet - Page 469

• Manufacturer Part Number: EP2AGX65DF29I5N
• Description: IC ARRIA II GX FPGA 65K 780FBGA
• Manufacturer: Altera
• Series: Arria II GXr

Specifications of EP2AGX65DF29I5N

• Number Of Logic Elements/cells: 60214
• Number Of Labs/clbs: 2530
• Total Ram Bits: 5246
• 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: Lead free / RoHS Compliant
• Number Of Gates: -

Chapter 1: Transceiver Architecture in Arria II Devices
Functional Modes
Figure 1–78. Deskew FIFO–Lane Skew at the Receiver Input
December 2010 Altera Corporation
Lane 0
Lane 2
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Figure 1–78
/A/ code group to align the channels.
After alignment of the first ||A|| column, if three additional aligned ||A|| columns are
observed at the output of the deskew FIFOs of the four channels, the
rx_channelaligned signal is asserted high, indicating channel alignment is acquired.
After acquiring channel alignment, if four misaligned ||A|| columns are seen at the
output of the deskew FIFOs in all four channels with no aligned ||A|| columns in
between, the rx_channelaligned signal is de-asserted low, indicating loss of channel
alignment.
Rate Match FIFO in XAUI Mode
In XAUI mode, the rate match FIFO is capable of compensating up to ±100 PPM
(200 PPM total) difference between the upstream transmitter and the local receiver
reference clock. The XAUI protocol requires the transmitter to send /R/ (/K28.0/)
code groups simultaneously on all four lanes (denoted as the ||R|| column) during
inter-packet gaps, adhering to rules listed in the IEEE P802.3ae specification.
The rate match operation begins after rx_syncstatus and rx_channelaligned are
asserted. The rx_syncstatus signal is from the word aligner, indicating that
synchronization is acquired on all four channels; the rx_channelaligned signal is
from the deskew FIFO, indicating channel alignment.
The rate match FIFO looks for the ||R|| column (simultaneous /R/ code groups on all
four channels) and deletes or inserts ||R|| columns to prevent the rate match FIFO
from overflowing or underrunning. The rate match FIFO can insert or delete as many
||R|| columns as necessary to perform the rate match operation.
The rx_rmfifodatadeleted and rx_rmfifodatainserted flags indicate rate match
FIFO deletion and insertion events, respectively, and are forwarded to the FPGA
fabric. If an ||R|| column is deleted, the rx_rmfifodeleted flag from each of the four
channels goes high for one clock cycle per deleted ||R|| column. If an ||R|| column is
inserted, the rx_rmfifoinserted flag from each of the four channels goes high for one
clock cycle per inserted ||R|| column.
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shows lane skew at the receiver input and how the deskew FIFO uses the
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Arria II Device Handbook Volume 2: Transceivers
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Lanes Skew at
Receiver Input
Lanes are Deskewed by Aligning
the /A/ Code Groups
1–83