EP2C5F256I8N Datasheet, PDF (77/168 Pages) Altera Corporation – Section I. Cyclone II Device Family Data Sheet

Configuration & Testing
Table 3–1. Cyclone II JTAG Instructions (Part 2 of 2)
JTAG Instruction
CONFIG_IO
SignalTap II
instructions
Instruction Code
00 0000 1101
Description
Allows configuration of I/O standards through the JTAG chain for
JTAG testing. Can be executed before, after, or during
configuration. Stops configuration if executed during configuration.
Once issued, the CONFIG_IO instruction holds nSTATUS low to
reset the configuration device. nSTATUS is held low until the
device is reconfigured.
Monitors internal device operation with the SignalTap II embedded
logic analyzer.
Note to Table 3–1:
(1) Bus hold and weak pull-up resistor features override the high-impedance state of HIGHZ, CLAMP, and EXTEST.
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
February 2007
3–3
Cyclone II Device Handbook, Volume 1