Visible to Intel only — GUID: sam1403479226485
Ixiasoft
Visible to Intel only — GUID: sam1403479226485
Ixiasoft
10.2. I/O Voltage for JTAG Operation
The Arria® V device operating in IEEE Std. 1149.1 BST mode uses four dedicated JTAG pins—TDI, TDO, TMS, and TCK. Arria® V devices do not support the optional TRST pin.
The TCK pin has an internal weak pull-down resistor, while the TDI and TMS pins have internal weak pull-up resistors. The 3.3-, 3.0-, or 2.5-V VCCPD supply of I/O bank 3A powers the TDO, TDI, TMS, and TCK pins. All user I/O pins are tri-stated during JTAG configuration.
The JTAG chain supports several different devices. Use the supported TDO and TDI voltage combinations listed in the following table if the JTAG chain contains devices that have different VCCIO levels. The output voltage level of the TDO pin must meet the specification of the TDI pin it drives.
Device | TDI Input Buffer Power (V) | Arria® V TDO VCCPD | ||
---|---|---|---|---|
VCCPD = 3.3 V | VCCPD = 3.0 V | VCCPD = 2.5 V | ||
Arria® V | VCCPD = 3.3 | Yes | Yes | Yes |
VCCPD = 3.0 | Yes | Yes | Yes | |
VCCPD = 2.5 | Yes | Yes | Yes | |
Non- Arria® V 39 | VCC = 3.3 | Yes | Yes | Yes |
VCC = 2.5 | Yes | Yes | Yes | |
VCC = 1.8 | Yes | Yes | Yes | |
VCC = 1.5 | Yes | Yes | Yes |