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EP2C5T144I8N Datasheet, PDF (308/470 Pages) Altera Corporation – Cyclone II Device Handbook, Volume 1 | |||
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I/O Termination
I/O Termination
The majority of the Cyclone II I/O standards are single-ended,
non-voltage-referenced I/O standards and, as such, the following I/O
standards do not specify a recommended termination scheme:
â 3.3-V LVTTL and LVCMOS
â 2.5-V LVTTL and LVCMOS
â 1.8-V LVTTL and LVCMOS
â 1.5-V LVCMOS
â 3.3-V PCI and PCI-X
Voltage-Referenced I/O Standard Termination
Voltage-referenced I/O standards require both an input reference
voltage, VREF, and a termination voltage, VTT. The reference voltage of the
receiving device tracks the termination voltage of the transmitting device.
For more information on termination for voltage-referenced I/O
standards, refer to âSupported I/O Standardsâ on page 10â1.
Differential I/O Standard Termination
Differential I/O standards typically require a termination resistor
between the two signals at the receiver. The termination resistor must
match the differential load impedance of the bus.
Cyclone II devices support differential I/O standards LVDS, RSDS, and
mini-LVDS, and differential LVPECL.
For more information on termination for differential I/O standards, refer
to âSupported I/O Standardsâ on page 10â1.
10â26
Cyclone II Device Handbook, Volume 1
Altera Corporation
February 2008
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