Voltage-Referenced I/O Standard Termination - Altera Cyclone IV Device Handbook

6–14

Voltage-Referenced I/O Standard Termination

Voltage-referenced I/O standards require an input reference voltage (V
termination voltage (V
termination voltage of the transmitting device, as shown in
Figure 6–5. Cyclone IV Devices HSTL I/O Standard Termination
Termination
External
On-Board
Termination
Transmitter
Cyclone IV Device
Family Series OCT
OCT with
and without
Calibration
Transmitter
Figure 6–6. Cyclone IV Devices SSTL I/O Standard Termination
Termination
External
On-Board
Termination
Transmitter
Cyclone IV Device
Family Series OCT
50
OCT with
and without
Calibration
Transmitter
Cyclone IV Device Handbook,
Volume 1
). The reference voltage of the receiving device tracks the
TT
HSTL Class I
V TT
50 Ω
50 Ω
V REF
Receiver
V TT
Ω
50 Ω
50
50 Ω
V REF
Receiver
SSTL Class I
V TT
50 Ω
25 Ω
50 Ω
V REF
Receiver
V TT
Ω
50 Ω
Ω
50
V REF
Receiver
Chapter 6: I/O Features in Cyclone IV Devices
Termination Scheme for I/O Standards
Figure 6–5
HSTL Class II
V TT V TT
50 Ω 50 Ω
50 Ω
V REF
Transmitter
V TT V TT
Cyclone IV Device
Family Series OCT
Ω
50 Ω 50 Ω
25
50 Ω
V REF
Transmitter
SSTL Class II
V TT
50 Ω 50 Ω
25 Ω
50 Ω
V REF
Transmitter
Cyclone IV Device
V TT
Family Series OCT
Ω
25
50 Ω
50 Ω
Ω
50
V REF
Transmitter
) and a
REF
and Figure 6–6.
Receiver
Receiver
V TT
Receiver
V TT
Receiver
March 2016 Altera Corporation