EP4SGX290KF40C3N Altera, EP4SGX290KF40C3N Datasheet - Page 522

• Manufacturer Part Number: EP4SGX290KF40C3N
• Description: IC STRATIX IV GX 290K 1517FBGA
• Manufacturer: Altera
• Series: Stratix® IV GXr

Specifications of EP4SGX290KF40C3N

• Number Of Logic Elements/cells: 291200
• Number Of Labs/clbs: 11648
• Total Ram Bits: 17248
• Number Of I /o: 744
• Voltage - Supply: 0.87 V ~ 0.93 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 1517-FBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -
• Other names: 544-2624

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Stratix IV Device Handbook Volume 2: Transceivers
1
The rate match FIFO consists of a 20-word deep FIFO and necessary logic that controls
insertion and deletion of a skip character or ordered set, depending on the PPM
difference.
The rate match FIFO is mandatory and cannot be bypassed in the following functional
modes:
■
■
■
The rate match FIFO is optional in the following functional modes:
■
■
■
The rate match FIFO receives data from the word aligner (non-XAUI functional
modes) or deskew FIFO (XAUI functional mode) in the receiver datapath. It provides
the following status signals forwarded to the FPGA fabric:
■
■
■
■
The rate match FIFO status signals are not available in PCIe mode. These signals are
encoded on the pipestatus[2:0] signal in PCIe mode as specified in the PCIe
specification.
In PCIe mode, the rate match FIFO is capable of compensating up to ± 300 PPM (total
600 PPM) difference between the upstream transmitter and the local receiver. The
PCIe protocol requires the transmitter to send SKP ordered sets during IPGs, adhering
to rules listed in the base specification. The SKP ordered set is defined as a /K28.5/
COM symbol followed by three consecutive /K28.0/ SKP symbol groups. The PCIe
protocol requires the receiver to recognize a SKP ordered set as a /K28.5/ COM
symbol followed by one to five consecutive /K28.0/ SKP symbols.
The rate match FIFO operation is compliant to PCIe Base Specification 2.0. The rate
match operation begins after the synchronization state machine in the word aligner
indicates synchronization is acquired by driving the rx_syncstatus signal high. The
rate match FIFO looks for the SKP ordered set and deletes or inserts SKP symbols as
necessary to prevent the rate match FIFO from overflowing or under-running.
PCIe
XAUI
GIGE
Basic single-width
Basic double-width
SRIO
rx_rmfifodatainserted—indicates insertion of a skip character or ordered set
rx_rmfifodatadeleted—indicates deletion of a skip character or ordered set
rx_rmfifofull—indicates rate match FIFO full condition
rx_rmfifoempty—indicates rate match FIFO empty condition
Rate Match FIFO in PCIe Mode
Chapter 1: Transceiver Architecture in Stratix IV Devices
February 2011 Altera Corporation
Transceiver Block Architecture