1 proc xilinx_dna_addr {chip} {
9 # Get the "Device DNA".
10 # Most Xilinx FPGA devices contain an embedded, unique device identifier.
11 # The identifier is nonvolatile, permanently programmed into
12 # the FPGA, and is unchangeable providing a great serial / tracking number.
13 # This function returns the DNA as a 64 bit integer with the 7 LSBs zeroed.
14 # This is compatible with the FUSE DNA which contains all 64 bits.
15 proc xilinx_get_dna {tap chip} {
16 set XC7_ISC_ENABLE 0x10
17 set XC7_ISC_DISABLE 0x16
18 set XC7_ISC_DNA [xilinx_dna_addr $chip]
20 irscan $tap $XC7_ISC_ENABLE
22 irscan $tap $XC7_ISC_DNA
23 scan [drscan $tap 32 0 32 0] "%08x %08x" hi lo
25 irscan $tap $XC7_ISC_DISABLE
27 # openocd interprets DR scans as LSB first, bit-reverse it
28 return [scan [string reverse [format "%032b%032bb0" $lo $hi]] "%i"]
31 # Print out the "Device DNA" in the same format that impact uses.
32 proc xilinx_print_dna {dna} {
33 set dna [expr $dna >> 64 - 57]
34 echo [format "DNA = %057b (0x%016x)" $dna $dna]
37 proc xc7_get_dna {tap} {
38 return [xilinx_get_dna $tap Series7]
41 proc xc6s_get_dna {tap} {
42 return [xilinx_get_dna $tap Spartan6]