Altera SerialLite II IP Core - Manual (Page 47)

3–24 Chapter 3: Parameter Settings
Transceiver Configuration
SerialLite II MegaCore Function January 2014 Altera Corporation
User Guide
Transceiver Configuration
This section describes the optional, configurable Altera ALTGX gigabit transceiver
megafunctions. The transceiver megafunction offers several configuration options
that can be set based on board-level conditions, design constraints, or other
application-specific requirements, to ensure the proper operation of the serial link.
1 If you select Arria V or Stratix V as the target device family, you are required to
instantiate the Custom PHY IP core as the hard transceiver. For more information
about this configuration, refer to
“MegaCore Configuration for Arria V, Cyclone V,
and Stratix V Devices” on page 4–19 .
f For more information on Altera gigabit transceiver (ALTGX)megafunction, refer to
the
Arria II GX Transceiver Architecture section in volume 2 of the Arria II GX Device
Handbook, and the Stratix IV Transceiver Architecture section in volume 2 of the
Stratix IV Device Handbook.
Voltage Output Differential (V
OD
) Control Settings
The Stratix IV transceivers allow you to set the V
OD
to handle different length,
backplane, and receiver requirements. A range from 200 to 1,200 mV is supported for
Stratix IV devices. Arria II GX devices have a fixed value, which cannot be changed.
The range is decoded using the GUI integer value and the on-chip transmitter
programmable termination values.
Table 3–10 shows how the V
OD
value you chose in the SerialLite II parameter editor
corresponds to the mV value. The V
OD
value is 0 by default.
This parameter is disabled when the number of lanes in the transmit direction is equal
to zero.
Pre-Emphasis Control Settings
The programmable Pre-emphasis setting boosts the high frequencies in the transmit
data signal, which may be attenuated by the transmission medium. The Pre-emphasis
setting maximizes the data eye opening at the far-end receiver, which is particularly
useful in lossy transmission mediums. Specify pre-emphasis control setting
parameter is set to 0 by default.
Table 3–10. V
OD
Control Settings
V
OD
Value (Per Lane) 100 Ohms (mV) Stratix IV
0 200
1 400
2 600
3 700
4 800
5 900
6 1,000
7 1,200