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DS2432 1-Wire SHA-1 EEPROM
The Spartan-3E Starter Kit board includes a Maxim DS2432 serial EEPROM with an
integrated SHA-1 engine. As shown in
1-Wire interface, which as the name implies, cleverly uses a single wire for power and
serial communication.
The DS2432 EEPROM offers one of many possible means to copy-protect the FPGA
configuration bitstream, making cloning difficult. Xilinx application note XAPP780, listed
under
UCF Location Constraints
Figure 17-2
EEPROM, including the I/O pin assignment and the I/O standard used.
Related Resources
•
•
Spartan-3E Starter Kit Board User Guide
UG230 (v1.0) March 9, 2006
"Related Resources"
provides one possible implementation method.
Spartan-3E FPGA
provides the UCF constraints for the FPGA connections to the DS2432 SHA-1
NET
"DS_WIRE"
LOC
= "U4" |
Figure 17-2: UCF Location Constraints for DS2432 SHA-1 EEPROM
Maxim DS2432 1-Wire EEPROM with SHA-1 Engine
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2914
XAPP780: FPGA IFF Copy Protection Using Dallas Semiconductor/Maxim DS2432 Secure
EEPROMs
http://www.xilinx.com/bvdocs/appnotes/xapp780.pdf
www.xilinx.com
Figure
17-1, the DS2432 EEPROM uses the Maxim
3.3V
Maxim DS2432
SHA-1 EEPROM
DS_WIRE
(U4)
Figure 17-1: SHA-1 EEPROM
IOSTANDARD
= LVCMOS33 |
Chapter 17
GND
UG230_c17_01_030906
SLEW
= SLOW
|
DRIVE
= 8 ;
129
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