User guide

Changing CTLE Settings in Manual Mode
To change the CTLE settings in manual mode, you can either update the Quartus II Settings File (.qsf)
with a known assignment, or follow the instructions below to perform a read-modify-write to the configu‐
ration registers using the reconfiguration interface.
1. Read from the CTLE feature address of the channel you want to change. For example, to change CTLE
AC gain, read and store the value of address 0x167.
2. Select a valid value for the feature according to the Arria 10 register map. For example, a valid setting
for CTLE AC Gain has a bit encoding of 5’b00000.
3. Perform a read-modify-write to the address of the CTLE feature using the valid value. For example, to
change the CTLE AC gain, write 5’b00000 to address 0x105.
Note:
To set the CTLE in manual mode, select "Manual" option in the CTLE adaptation mode parameter
in the RX PMA tab of the Arria 10 Native PHY IP core.
Table 6-7: Register Map for CTLE Settings
CTLE Feature Address Bits Values Description
One Stage Enable 0x11B [3]
1’b0- Selects Four Stage
1’b1- Selects One Stage
Selects the equalizer path as
either One Stage or Four
Stage mode.
DC Gain 0x11C,
0x11A
[3:0], [7:0] 12’b000000000000
12’b111000000000
12’b111111000000
12’b111111111000
12’b111111111111
Sets the DC gain values.
CTLE AC Gain One
Stage
0x166 [4:1] 4’b0000- 4’b1111 Sets the AC gain value
when one stage mode is
selected. A higher value
means higher peaking by
suppressing DC gain.
CTLE AC Gain Four
Stage
0x167 [5:1] 5’b00000 – 5’b11111 Sets the AC gain value
when four stage mode is
selected.
VGA SEL 0x160 [3:1] 3’b000 – 3’b111 Sets the VGA Gain value
Enabling and Disabling Loopback Modes
Arria 10 devices have three loopback modes:
• Serial Loopback
• Reverse Serial Loopback (Pre-CDR)
• Reverse Serial Loopback (Post-CDR)
The loopback mode can be dynamically reconfigured by accessing the register space.
UG-01143
2015.05.11
Changing CTLE Settings in Manual Mode
6-15
Reconfiguration Interface and Dynamic Reconfiguration
Altera Corporation
Send Feedback