External loopback mode, Prbs generation and validation, External loopback mode -2 – Altera 100G Interlaken MegaCore Function User Manual
Page 87: Prbs generation and validation -2
External Loopback Mode
The 100G Interlaken IP core operates correctly in an external loopback configuration.
To put the IP core in external loopback mode, connect the TX lanes to the RX lanes of the IP core. This
mode does not require any special programming of the IP core.
Related Information
100G Interlaken IP Core Testbench
on page 7-1
The testbench simulates the IP core in external loopback mode.
PRBS Generation and Validation
The 100G Interlaken IP core supports generation and validation of several predetermined pseudo-random
binary sequences (PRBS) for Interlaken link testing.
This feature is available if you turn on Include diagnostic features in the 100G Interlaken parameter
editor.
Table 8-1: PRBS Polynomials Available in the 100G Interlaken IP Core
Pattern
Name
Polynomial
Defined in
Interlaken
Specification
Available in 100G Interlaken IP Core Variations with
Target Device Family
Arria V or Stratix V
Arria 10
PRBS7
x
7
+ x
6
+ 1
Yes
Yes
No
PRBS9
x
9
+ x
5
+1
No
Yes
Yes
PRBS15 x
15
+ x
14
+1
No
No
Yes
PRBS23 x
23
+ x
18
+ 1
Yes
Yes
Yes
PRBS31 x
31
+ x
28
+ 1
Yes
Yes
Yes
For instructions to activate and use the PRBS test feature in your 100G Interlaken IP core IP core, refer to
one of the following two topics:
Setting up PRBS Mode in Arria V and Stratix V Devices
on page 8-2
Setting up PRBS Mode in Arria 10 Devices
on page 8-4
Setting up PRBS Mode in Arria V and Stratix V Devices
To enable the IP core to generate PRBS output, you must program the relevant hard PCS registers to
enable the PRBS generator clock, to set the test_enable bit, and to select the PRBS polynomial. To enable
the IP core to receive PRBS input, you must program the relevant hard PCS registers to enable the PRBS
receiver clock, to set the test_enable bit, and to select the expected PRBS polynomial. If you perform your
PRBS testing in loopback mode, you must enable the IP core to both generate and receive PRBS
sequences.
The PRBS feature is available only if you turn on Include diagnostic features in the 100G Interlaken
parameter editor.
8-2
External Loopback Mode
UG-01128
2015.05.04
Altera Corporation
100G Interlaken IP Core Test Features