Specifications

Table 9-3: Supported TDO and TDI Voltage Combinations
The TDO output buffer for V
CCPD
of 3.3 V or 3.0 V meets V
OH
(MIN) of 2.4 V, and the TDO output buffer for V
CCPD
of 2.5 V meets V
OH
(MIN) of 2.0 V.
Cyclone V TDO V
CCPD
TDI Input Buffer
Power (V)
Device
V
CCPD
= 2.5 VV
CCPD
= 3.0 VV
CCPD
= 3.3 V
YesYesYesV
CCPD
= 3.3
Cyclone V
YesYesYesV
CCPD
= 3.0
YesYesYesV
CCPD
= 2.5
YesYesYesV
CC
= 3.3
Non-Cyclone V
(20)
YesYesYesV
CC
= 2.5
YesYesYesV
CC
= 1.8
YesYesYesV
CC
= 1.5
Performing BST
You can issue BYPASS, IDCODE, and SAMPLE JTAG instructions before, after, or during configuration
without having to interrupt configuration.
To issue other JTAG instructions, follow these guidelines:
•
To perform testing before configuration, hold the nCONFIG pin low.
•
To perform BST during configuration, issue CONFIG_IO JTAG instruction to interrupt configuration.
While configuration is interrupted, you can issue other JTAG instructions to perform BST. After BST is
completed, issue the PULSE_CONFIG JTAG instruction or pulse nCONFIG low to reconfigure the
device.
The chip-wide reset (DEV_CLRn) and chip-wide output enable (DEV_OE) pins on Cyclone V devices do
not affect JTAG boundary-scan or configuration operations. Toggling these pins does not disrupt BST
operation (other than the expected BST behavior).
If you design a board for JTAG configuration of Cyclone V devices, consider the connections for the dedicated
configuration pins.
Related Information
• Cyclone V Device Family Pin Connection Guidelines
Provides more information about pin connections.
• Configuration, Design Security, and Remote System Upgrades in Cyclone V Devices
Provides more information about JTAG configuration.
• Cyclone V Device Datasheet
Provides more information about JTAG configuration timing.
(20)
The input buffer must be tolerant to the TDO V
CCPD
voltage.
Altera Corporation
JTAG Boundary-Scan Testing in Cyclone V Devices
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9-7
Performing BST
CV-52009
2013.05.06