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Figure 5-3: Transmitter Buffer
TX
V
CM
To Serial Data
Output Pins
(tx_serial_data)
Programmable
Pre-Emphasis
and VOD
Receiver
Detect
On-Chip
Termination
85Ω, 100Ω, OFF
High Speed Differential I/O
To improve performance, Arria 10 Transmitter uses a new architecture in the output buffer—High Speed
Differential I/O. You should select "High Speed Differential I/O" for I/O standard of Arria 10 Transmitter
pin in Quartus II Assignment Editor or QSF file.
Programmable Output Differential Voltage
You can program the differential output voltage (output swing) to handle different channel losses and
receiver requirements. There are 31 differential V
OD
settings up to VCCT power supply level. The step
size is 1/30 of the VCCT power supply level.
Figure 5-4: V
OD
(Differential) Signal Level
Differential Waveform
+V
P
V
OD
(Differential)
–V
N
V
OD
(Differential) = V
P
- V
N
0 V Differential
Related Information
XCVR_A10_RX_TERM_SEL on page 8-5
For more information, refer to Arria 10 Pre-Emphasis and Output Swing Settings
UG-01143
2015.05.11
High Speed Differential I/O
5-3
Arria 10 Transceiver PHY Architecture
Altera Corporation
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