EP3SL150F780I3N Altera, EP3SL150F780I3N Datasheet - Page 456

• Manufacturer Part Number: EP3SL150F780I3N
• Description: Stratix III
• Manufacturer: Altera

I/O Voltage Support in JTAG Chain
I/O Voltage
Support in JTAG
Chain
13–18
Stratix III Device Handbook, Volume 1
USERCODE Instruction Mode
Use the USERCODE instruction mode to examine the user electronic
signature (UES) within the devices along an IEEE Std. 1149.1 chain. When
you select this instruction, the device identification register is connected
between the TDI and TDO ports. The user-defined UES is shifted into the
device ID register in parallel from the 32-bit USERCODE register. The UES
is then shifted out through the device ID register.
1
CLAMP Instruction Mode
Use the CLAMP instruction mode to allow the state of the signals driven
from the pins to be determined from the boundary-scan register while the
bypass register is selected as the serial path between the TDI and TDO
ports. The state of all signals driven from the pins are completely defined
by the data held in the boundary-scan register.
HIGHZ Instruction Mode
The HIGHZ instruction mode sets all of the user I/O pins to an inactive
drive state. These pins are tri-stated until a new JTAG instruction is
executed. When this instruction is loaded into the instruction register, the
bypass register is connected between the TDI and TDO ports.
The JTAG chain supports several devices. However, you should use
caution if the chain contains devices that have different V
output voltage level of the TDO pin must meet the specifications of the
TDI pin it drives. The TDI of one Stratix III device connected in a chain to
the TDO pins of another Stratix III device are powered by the V
(2.5 V / 3.0 V) supply of I/O Bank 1A. You should connect V
according to the I/O standard used in the same bank. For 3.3 V and 3.0 V
The UES value is not user defined until after the device is
configured. This is because the value is stored in the
programmer object file (.pof) and only loaded to the device
during configuration. Before configuration, the UES value is set
to the default value.
Altera Corporation
CCIO
November 2007
CCPD
levels. The
CCPD