EP4CE55F23I8L Altera, EP4CE55F23I8L Datasheet - Page 347
EP4CE55F23I8L
Manufacturer Part Number
EP4CE55F23I8L
Description
IC CYCLONE IV FPGA 55K 484FBGA
Manufacturer
Altera
Series
CYCLONE® IV Er
Datasheets
1.EP4CGX15BN11C8N.pdf
(44 pages)
2.EP4CGX15BN11C8N.pdf
(14 pages)
3.EP4CGX15BN11C8N.pdf
(478 pages)
4.EP4CGX15BN11C8N.pdf
(10 pages)
Specifications of EP4CE55F23I8L
Number Of Logic Elements/cells
55856
Number Of Labs/clbs
3491
Total Ram Bits
2340000
Number Of I /o
324
Voltage - Supply
0.97 V ~ 1.03 V
Mounting Type
Surface Mount
Operating Temperature
-40°C ~ 100°C
Package / Case
484-FBGA
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Number Of Gates
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
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Part Number:
EP4CE55F23I8LN
Manufacturer:
ALTERA
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239
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Chapter 1: Cyclone IV Transceivers Architecture
Transceiver Functional Modes
© December 2010 Altera Corporation
1
Clock Rate Compensation
In XAUI mode, the rate match FIFO compensates 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 ||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, while 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 under running. 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 that indicate
rate match FIFO deletion and insertion events, respectively, 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.
The rate match FIFO does not insert or delete code groups automatically to overcome
FIFO empty or full conditions. In this case, the rate match FIFO asserts the
rx_rmfifofull and rx_rmfifoempty flags for at least three recovered clock
cycles to indicate rate match FIFO full and empty conditions, respectively. You must
then assert the rx_digitalreset signal to reset the receiver PCS blocks.
Cyclone IV Device Handbook, Volume 2
1–67
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