User guide

124 www.xilinx.com Spartan-6 FPGA Configuration User Guide
UG380 (v2.7) October 29, 2014
Chapter 6: Readback and Configuration Verification
Table 6-6: Shutdown Readback Command Sequence (JTAG)
Step Description
Set and Hold
# of Clocks
(TCK)
TDI TMS
1
Clock five
1s on TMS to bring the device to the TLR
state.
X15
Move into the RTI state. X 0 1
Move into the Select-IR state. X 1 2
Move into the Shift-IR state. X 0 2
2
Shift the first five bits of the CFG_IN instruction,
LSB first.
00101 05
Shift the MSB of the CFG_IN instruction while
exiting Shift-IR.
011
Move into the SELECT-DR state. X 1 2
Move into the SHIFT-DR state. X 0 2
3
Shift configuration packets into the CFG_IN data
register, MSB first.
a:
0xFFFF
b: 0xAA99
b: 0x5566
c: 0x30A1
d: 0x0007
e: 0x2000
f: 0x2000
0111
Shift the LSB of the last configuration packet while
exiting SHIFT-DR.
011
Move into the SELECT-IR state. X 1 3
Move into the SHIFT-IR state. X 0 2
4
Shift the first five bits of the JSHUTDOWN
instruction, LSB first.
01101 05
Shift the MSB of the JSHUTDOWN instruction
while exiting SHIFT-IR.
011
5
Move into the RTI state; remain there for 24 TCK
cycles.
X024
Move into the Select-IR state. X 1 2
Move into the Shift-IR state. X 0 2
6
Shift the first five bits of the CFG_IN instruction,
LSB first.
00101 05
Shift the MSB of the CFG_IN instruction while
exiting SHIFT-IR.
011
Move into the SELECT-DR state. X 1 2
Move into the SHIFT-DR state. X 0 2