3. Configuration & Testing
S51003-1.3
All Stratix® devices provide JTAG BST circuitry that complies with the
IEEE Std. 1149.1a-1990 specification. JTAG boundary-scan testing can be
performed either before or after, but not during configuration. Stratix
devices can also use the JTAG port for configuration together with either
the Quartus® II software or hardware using either Jam Files (.jam) or Jam
Byte-Code Files (.jbc).
IEEE Std. 1149.1
(JTAG)
Boundary-Scan
Support
Stratix devices support IOE I/O standard setting reconfiguration through
the JTAG BST chain. The JTAG chain can update the I/O standard for all
input and output pins any time before or during user mode through the
CONFIG_IOinstruction. You can use this ability for JTAG testing before
configuration when some of the Stratix pins drive or receive from other
devices on the board using voltage-referenced standards. Since the Stratix
device may not be configured before JTAG testing, the I/O pins may not
be configured for appropriate electrical standards for chip-to-chip
communication. Programming those I/O standards via JTAG allows you
to fully test the I/O connection to other devices.
The enhanced PLL reconfiguration bits are part of the JTAG chain before
configuration and after power-up. After device configuration, the PLL
reconfiguration bits are not part of the JTAG chain.
The JTAG pins support 1.5-V/1.8-V or 2.5-V/3.3-V I/O standards. The
TDOpin voltage is determined by the VCCIO of the bank where it resides.
The VCCSELpin selects whether the JTAG inputs are 1.5-V, 1.8-V, 2.5-V, or
3.3-V compatible.
Stratix devices also use the JTAG port to monitor the logic operation of the
device with the SignalTap® II embedded logic analyzer. Stratix devices
support the JTAG instructions shown in Table 3–1.
The Quartus II software has an Auto Usercode feature where you can
choose to use the checksum value of a programming file as the JTAG user
code. If selected, the checksum is automatically loaded to the USERCODE
register. In the Settings dialog box in the Assignments menu, click Device
& Pin Options, then General, and then turn on the Auto Usercode
option.
Altera Corporation
July 2005
3–1
ALTERA [ ALTERA CORPORATION ]
