XC5VLX50-1FFG676I Xilinx Inc, XC5VLX50-1FFG676I Datasheet - Page 159

• Manufacturer Part Number: XC5VLX50-1FFG676I
• Description: FPGA Virtex®-5 Family 46080 Cells 65nm (CMOS) Technology 1V 676-Pin FCBGA
• Manufacturer: Xilinx Inc
• Series: Virtex™-5 LXr

Specifications of XC5VLX50-1FFG676I

• Package: 676FCBGA
• Family Name: Virtex®-5
• Device Logic Units: 46080
• Typical Operating Supply Voltage: 1 V
• Maximum Number Of User I/os: 440
• Ram Bits: 1769472
• Number Of Logic Elements/cells: 46080
• Number Of Labs/clbs: 3600
• Total Ram Bits: 1769472
• Number Of I /o: 440
• Voltage - Supply: 0.95 V ~ 1.05 V
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 100°C
• Package / Case: 676-BBGA, FCBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: HW-V5-ML561-UNI-G - EVALUATION PLATFORM VIRTEX-5HW-V5-ML550-UNI-G - EVALUATION PLATFORM VIRTEX-5HW-V5-ML521-UNI-G - EVALUATION PLATFORM VIRTEX-5HW-V5GBE-DK-UNI-G - KIT DEV V5 LXT GIGABIT ETHERNET122-1508 - EVALUATION PLATFORM VIRTEX-5
• Number Of Gates: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Virtex-5 FPGA User Guide
UG190 (v5.3) May 17, 2010
ECC Modes Overview
In the standard ECC mode (EN_ECC_READ = TRUE and EN_ECC_WRITE = TRUE), both
encoder and decoder are enabled. During write, 64-bit data and 8-bit ECC generated parity
are stored in the array. The external parity bits are ignored. During read, the 72-bit decoded
data and parity are read out.
The encoder and decoder can be accessed separately for external use in RAMB36SDP. To
use the encoder by itself, send the data in through the DI port and sample the ECCPARITY
output port. To use the decoder by itself, disable the encoder, write the data into the block
RAM and read the corrected data and status bits out of the block RAM. See
(RAMB36SDP)
To use the decoder in ECC decode-only mode, set EN_ECC_WRITE = FALSE and
EN_ECC_READ = TRUE.
The encoder can be used in two ways:
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•
The functionality of the block RAM when using the ECC mode is described as follows:
•
•
•
•
•
To use the encoder in standard ECC mode, set (EN_ECC_WRITE = TRUE and
EN_ECC_READ = TRUE). In this mode, the DI setup time is smaller but the clock-to-
out for ECCPARITY is larger.
To use the encoder-only mode, set (EN_ECC_WRITE = TRUE and
EN_ECC_READ = FALSE). In this mode, the DI setup time is larger but the clock-to-
out for ECCPARITY is smaller.
The block RAM ports still have independent address, clocks, and enable inputs, but
one port is a dedicated write port, and the other is a dedicated read port (simple dual-
port).
DO represents the read data after correction.
DO stays valid until the next active read operation.
Simultaneous decoding and encoding, even with asynchronous clocks, is allowed, but
requires careful clock timing if read and write addresses are identical.
The NO_CHANGE or WRITE_FIRST modes of the normal block RAM operation are
not applicable to the ECC configuration.
Attributes.
www.xilinx.com
Built-in Error Correction
Block RAM
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