User guide

Description
Selects between the RX high gain mode or RX high data rate mode for the equalizer. If no assignment is
made, then NON_S1_MODE is chosen by default, for data rates up to 17.4 Gbps. For data rates greater
than 17.4 Gpbs, S1_MODE is the default value.
Table 8-9: Available Options
Value Description
NON_S1_MODE Selects high gain mode.
Selects high gain mode for data rates up to 17.4 Gbps.
S1_MODE Selects high data rate mode.
For data rates up to 28 Gbps, you can either select high gain mode or high data
rate mode. Power consumption is reduced in high data rate mode.
Assign To
RX serial data.
Syntax
set_instance_assignment -name XCVR_A10_RX_ONE_STAGE_ENABLE <value> -to <rx_serial_data
pin name>
VGA Settings
XCVR_A10_RX_ADP_VGA_SEL
Pin planner or Assignment Editor Name
Receiver Variable Gain Amplifier Voltage Swing Select
Description
The variable gain amplifier (VGA) amplifies the signal amplitude and ensures a constant voltage swing
before the data is fed to the CDR for sampling. This assignment controls the VGA output voltage swing
when adaptation is disabled for both continuous time linear equalizer (CTLE) and decision feedback
equalizer (DFE) blocks (in manual mode). The default value is set to RADP_VGA_SEL_4 for VGA
Output Voltage Swing Setting 4.
Table 8-10: Available Options
Value Description
RADP_VGA_SEL_<0 to 7> VGA Output Voltage Swing Setting <0 to 7>
Assign To
RX serial data.
UG-01143
2015.05.11
VGA Settings
8-9
Analog Parameter Settings
Altera Corporation
Send Feedback