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Virtex-II Platform FPGAs: Functional Description
ments to begin changing state in response to the logic and
the user clock.
The keys are stored in the FPGA by JTAG instruction and
retained by a battery connected to the V pin, when the
BATT
device is not powered. Virtex-II devices can be configured
with the corresponding encrypted bitstream, using any of
the configuration modes described previously.
The relative timing of these events can be changed via con-
figuration options in software. In addition, the GTS and
GWE events can be made dependent on the DONE pins of
multiple devices all going High, forcing the devices to start
synchronously. The sequence can also be paused at any
stage, until lock has been achieved on any or all DCMs, as
well as the DCI.
A detailed description of how to use bitstream encryption is
provided in the Virtex-II Platform FPGA User Guide. For
devices that support this feature, please contact your sales
representative for specific ordering part number.
Readback
Partial Reconfiguration
In this mode, configuration data from the Virtex-II FPGA
device can be read back. Readback is supported only in the
SelectMAP (master and slave) and Boundary-Scan mode.
Partial reconfiguration of Virtex-II devices can be accom-
plished in either Slave SelectMAP mode or Boundary-Scan
mode. Instead of resetting the chip and doing a full configu-
ration, new data is loaded into a specified area of the chip,
while the rest of the chip remains in operation. Data is
loaded on a column basis, with the smallest load unit being
a configuration “frame” of the bitstream (device size depen-
dent).
Along with the configuration data, it is possible to read back
the contents of all registers, distributed SelectRAM, and
block RAM resources. This capability is used for real-time
debugging. For more detailed configuration information, see
the Virtex-II Platform FPGA User Guide.
Partial reconfiguration is useful for applications that require
different designs to be loaded into the same area of a chip,
or that require the ability to change portions of a design
without having to reset or reconfigure the entire chip.
Bitstream Encryption
Virtex-II devices have an on-chip decryptor using one or two
sets of three keys for triple-key Data Encryption Standard
(DES) operation. Xilinx software tools offer an optional
encryption of the configuration data (bitstream) with a tri-
ple-key DES determined by the designer.
Revision History
This section records the change history for this module of the data sheet.
Date
Version
1.0
Revision
11/07/2000
12/06/2000
Early access draft.
Initial release.
1.1
Added values to the tables in the Virtex-II Performance Characteristics and Virtex-II
Switching Characteristics sections.
01/15/2001
01/25/2001
1.2
1.3
The data sheet was divided into four modules (per the current style standard). A note was
added to Table 1.
•
•
Under Input/Output Individual Options, the range of values for optional pull-up and
pull-down resistors was changed to 10 - 60 KΩ from 50 - 100 KΩ.
Skipped v1.4 to sync up modules. Reverted to traditional double-column format.
04/02/2001
1.5
•
•
Added Table 6.
Changed definition of multiply and divide integer ranges under Digital Clock Manager
(DCM).
Made numerous minor edits throughout this module.
07/30/2001
10/02/2001
1.6
1.7
•
•
Updated descriptions under Digitally Controlled Impedance (DCI), Global Clock
Multiplexer Buffers, Digital Clock Manager (DCM), and Creating a Design.
10/12/2001
11/29/2001
1.8
1.9
•
•
Made clarifying edits under Digital Clock Manager (DCM).
Changed bitstream lengths for each device in Table 26.
DS031-2 (v4.0) April 7, 2014
Product Specification
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