I/O Voltage For Jtag Operation; Performing Bst - Altera Cyclone V Device Handbook

CV-52009
2014.01.10

I/O Voltage for JTAG Operation

The Cyclone V device operating in IEEE Std. 1149.1 BST mode uses four dedicated JTAG pins—
, and
TMS TCK
The pin has an internal weak pull-down resistor, while the
TCK
resistors. The 3.3-, 3.0-, or 2.5-V V
user I/O pins are tri-stated during JTAG configuration.
The JTAG chain supports several different devices. Use the supported
listed in the following table if the JTAG chain contains devices that have different V
voltage level of the
Table 9-3: Supported TDO and TDI Voltage Combinations
The TDO output buffer for V
of 2.5 V meets V
OH
Device
Cyclone V
Non-Cyclone V

Performing BST

You can issue
having to interrupt configuration.
To issue other JTAG instructions, follow these guidelines:
To perform testing before configuration, hold the
(22)
The input buffer must be tolerant to the TDO V
JTAG Boundary-Scan Testing in Cyclone V Devices
Send Feedback
1100010111
0111100000
1110110011
0011100101
0011100110
0000101010
0000101011
. Cyclone V devices do not support the optional
CCPD
pin must meet the specification of the
TDO
of 3.3 V or 3.0 V meets V
CCPD
(MIN) of 2.0 V.
TDI Input Buffer
Power (V)
V = 3.3
CCPD
V = 3.0
CCPD
V = 2.5
CCPD
V = 3.3
CC
V = 2.5
CC
(22)
V = 1.8
CC
V = 1.5
CC
, , and
BYPASS IDCODE SAMPLE
TRST
TDI
supply of I/O bank 3A powers the
TDI
(MIN) of 2.4 V, and the TDO output buffer for V
OH
Cyclone V TDO V
V = 3.3 V V
CCPD CCPD
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
JTAG instructions before, after, or during configuration without
pin low.
nCONFIG
voltage.
CCPD
I/O Voltage for JTAG Operation
pin.
and pins have internal weak pull-up
TMS
, ,
TDO TDI TMS
and voltage combinations
TDO TDI
CCIO
pin it drives.
CCPD
= 3.0 V V
CCPD
9-7
, ,
TDI TDO
, and pins. All
TCK
levels. The output
CCPD
= 2.5 V
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Altera Corporation