Ultracompact AES Core
 64 Point FFT Core
1024 Point FFT Core
XTS-AES P1619 core
GCM (802.1ae)  Core
AES Key Wrap
802.16e WiMAX CCM Core
802.11i CCM Core
Zigbee CCM* Core
802.15.3 CCM Core
Combo LRW/GCM core
AES-GCM Cores Shipped for Actel FPGA

10/5/2007 GCM/XTS/CBC core shipped

6/19/2007 Three FFT cores announced

6/12/2007 AES-GCM core reaches 10 Gbps on an FPGA

10/17/2006 AES1-32E gets a FIPS 197 validation


Information on
Export Licensing


IP Cores, Inc.
3731 Middlefield Rd.
Palo Alto, CA 94303, USA
Phone: +1 (650) 815-7996

E-mail: [email protected]

XTS-AES IEEE P1619 Core Families XTS2 and XTS3


General Description

XTS3 implements the NIST standard AES cipher in the XEX/XTS mode for encryption and decryption. The XTS3 family of cores covers a wide range of area / throughput combinations, allowing the designer to choose the smallest core that satisfies the desired clock/throughput requirements. XTS2 is similar to XTS3, but supports only 128-bit keys. Each core contains the base AES core AES1 and is available for immediate licensing.

The design is fully synchronous and available in both source and netlist form.


Key Features

Small size: XTS2-12.8 starts at less than 30,000 ASIC gates and delivers throughput of 7 Gbps. XTS3-18.2 starts at less than 50,000 ASIC gates at throughput of 18.2 bits per clock

Completely self-contained: does not require external memory

Supports both encryption and decryption

Includes key expansion and CTS support

Supports XEX-based Tweaked CodeBook mode (TCB) with CipherText Stealing (CTS) (XTS) mode encryption and decryption

128+128 and 256+256 bit AES keys supported.

Easily parallelizable for even higher data rates

Flow-through design

Test bench provided


  • Hard drive encryption compliant with the IEEE P1619

Pin Description

Name Type Description
CLK Input Core clock signal
CEN Input Synchronous enable signal. When LOW the core ignores all its inputs and all its outputs must be ignored.
E/D Input When HIGH, core is encrypting, when LOW core is decrypting When HIGH, core uses the 256-bit key
K256 Input When HIGH, core uses the 256-bit key
START Input HIGH level starts the input data processing
READ Output Read request for the input data byte
WRITE Output Write signal for the output interface
D[127:0] Input

Input Data (other data bus widths are also available)

  • plain or cipher text
IV[127:0] Input IV (logical position)
K1[255:0] Input

AES key

K2[255:0] Input Tweak key (K2)
Q[127:0] Output Output plain or cipher text

Function Description

The Advanced Encryption Standard (AES) algorithm is a new NIST data encryption standard as defined in the http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf.

The XTS3 implementation fully supports the AES algorithm for XTS-AES-256 and XTS-AES-128  as defined by the P1619 draft standard. XTS2 supports only XTS-AES-128.

The core is designed for flow-through operation, with 128-bit wide input and output interfaces. XTS2 and XTS3 support both encryption and decryption modes.

Implementation Results

Area Utilization and Performance

Representative area/resources figures are shown below.

Core Type Technology Area / Resources Max Frequency Throughput
XTS3-64 TSMC 0.09 µ LV 140,500 gates 215 MHz 13.7 Gbps

Multiple XTS3 cores can be easily paralleled for throughputs of 100 Gbps and higher.

Export Permits

US Bureau of Industry and Security has assigned the export control classification number 5E002 to our AES core. The core is eligible for the license exception ENC under section 740.17(A) and (B)(1) of the export administration regulations. See the licensing basics page, for links to US government sites and more details.


HDL Source Licenses
  • Synthesizable Verilog RTL source code
  • Verilog testbench (self-checking)
  • Vectors for testbench
  • Expected results
  • User Documentation

Netlist Licenses
  • Post-synthesis EDIF
  • Testbench (self-checking)
  • Vectors for testbench
  • Expected results

Contact Information

IP Cores, Inc.
3731 Middlefield Rd.
Palo Alto, CA 94303, USA
Phone: +1 (650) 815-7996
E-mail: [email protected]
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