LFE2-20E-5FN256I Lattice, LFE2-20E-5FN256I Datasheet - Page 739

• Manufacturer Part Number: LFE2-20E-5FN256I
• Description: IC FPGA 21KLUTS 193I/O 256FPBGA
• Manufacturer: Lattice
• Series: ECP2r

Specifications of LFE2-20E-5FN256I

• Number Of Logic Elements/cells: 21000
• Number Of Labs/clbs: 2625
• Total Ram Bits: 282624
• Number Of I /o: 193
• Number Of Gates: -
• Voltage - Supply: 1.14 V ~ 1.26 V
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 100°C
• Package / Case: 256-BGA
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 220-1170; LFE2-20E-5FN256I; Q6411457

Lattice Semiconductor
when the internal Done bit is set at the end of configuration. This is done so that if there is any data overflow (to
other devices in a chain) the downstream devices will receive raw data from configuration storage.
But what happens if the key in the FPGA does not match the key used to encrypt the file? Once the data is
decrypted, the FPGA expects to find a valid standard bitstream preamble (BDB3), along with proper commands
and data that pass CRC checks. If the keys do not match then the decryption engine will not produce a proper con-
figuration bitstream; either configuration will not start because the preamble was not found (the INITN pin stays
high and the DONE pin stays low) or CRC errors will occur, causing the INITN pin to go low to indicate the error
(see TN1108,
References
• TN1108,
• Federal Information Processing Standard Publication 197, Nov. 26, 2001. Advanced Encryption Standard (AES)
Technical Support Assistance
Hotline: 1-800-LATTICE (North America)
e-mail:
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Revision History
September 2006
August 2007
March 2007
June 2010
April 2006
[phone] (Outside North America)
[e-mail]
www.latticesemi.com
Date
LatticeECP2/M sysCONFIG Usage Guide
LatticeECP2/M sysCONFIG Usage
Version
01.0
01.1
01.2
01.3
01.4
Initial release.
Added information throughout for LatticeECP2M support.
Updated screen shots based on the latest software version.
Provided clarification in Table 1.
Changed Bitstream Preamble to Alignment Preamble through out the
document.
Reworded sections of the document to provide additional informa-
tion/clarification.
Added “S” series encryption information throughout.
Updated for “S” series reduced frequency support and special require-
ment for CCLK and TCK on LatticeSCM, and PCM and JTAG configura-
tion modes.
Updated for Lattice Diamond design software support.
Guide, for more information on INITN and DONE).
16-11
Configuration Encryption Usage Guide
Change Summary
LatticeECP2/M S-Series