10-6
Supported JTAG Instruction
SV51012
2014.01.10
JTAG Instruction
LOCK
UNLOCK
KEY_CLR_VREG
KEY_VERIFY
EXTEST_PULSE
EXTEST_TRAIN
Altera Corporation
Instruction Code
01 1111 0000
11 0011 0001
00 0010 1001
00 0001 0011
00 1000 1111
00 0100 1111
Description
Put the device in JTAG secure mode.
In this mode, only BYPASS , SAMPLE /
PRELOAD , EXTEST , IDCODE ,
SHIFT_EDERROR_REG , and UNLOCK
instructions are supported. This
instruction can only be accessed
through JTAG core access in user
mode. It cannot be accessed through
external JTAG pins in test or user
mode.
Release the device from the JTAG
secure mode to enable access to all
other JTAG instructions. This instruc-
tion can only be accessed through
JTAG core access in user mode. It
cannot be accessed through external
JTAG pins in test or user mode.
Clears the volatile key.
Verifies the non-volatile key has been
cleared.
Enables board-level connectivity
checking between the transmitters and
receivers that are AC coupled by
generating three output transitions:
? Driver drives data on the falling
edge of TCK in the UPDATE_IR/DR
state.
? Driver drives inverted data on the
falling edge of TCK after entering the
RUN_TEST/IDLE state.
? Driver drives data on the falling
edge of TCK after leaving the
RUN_TEST/IDLE state.
The EXTEST_PULSE JTAG instruction
is only supported in user mode for
Stratix V devices.
Behaves the same as the EXTEST_PULSE
instruction except that the output
continues to toggle on the TCK falling
edge as long as the TAP controller is in
the RUN_TEST/IDLE state.
The EXTEST_TRAIN JTAG instruction
is only supported in user mode for
Stratix V devices.
JTAG Boundary-Scan Testing in Stratix V Devices
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