10-4
Supported JTAG Instruction
SV51012
2014.01.10
JTAG Instruction
EXTEST
BYPASS
USERCODE
IDCODE
Altera Corporation
Instruction Code
00 0000 1111
11 1111 1111
00 0000 0111
00 0000 0110
Description
? Allows you to test the external
circuit and board-level intercon-
nects by forcing a test pattern at the
output pins, and capturing the test
results at the input pins. Forcing
known logic high and low levels on
output pins allows you to detect
opens and shorts at the pins of any
device in the scan chain.
? The high-impedance state of EXTEST
is overridden by bus hold and weak
pull-up resistor features.
Places the 1-bit bypass register between
the TDI and TDO pins. During normal
device operation, the 1-bit bypass
register allows the BST data to pass
synchronously through the selected
devices to adjacent devices.
? Examines the user electronic
signature (UES) within the devices
along a JTAG chain.
? Selects the 32-bit USERCODE register
and places it between the TDI and
TDO pins to allow serial shifting of
USERCODE out of TDO .
? The UES value is set to default value
before configuration and is only
user-defined after the device is
configured.
? Identifies the devices in a JTAG
chain. If you select IDCODE , the
device identification register is
loaded with the 32-bit
vendor-defined identification code.
? Selects the IDCODE register and
places it between the TDI and TDO
pins to allow serial shifting of
IDCODE out of TDO .
? IDCODE is the default instruction at
power up and in the TAP RESET
state. Without loading any instruc-
tions, you can go to the SHIFT_DR
state and shift out the JTAG device
ID.
JTAG Boundary-Scan Testing in Stratix V Devices
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