F-Tile Dynamic Reconfiguration Design Example User Guide

ID 710582
Date 9/26/2022

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5.1.1. Ethernet to CPRI Dynamic Reconfiguration Design Example: Simulation Testbench

Ethernet to CPRI Dynamic Reconfiguration example design simulation testbench block diagram is shown in the following figure:
Figure 26. Simulation Testbench Block Diagram for Ethernet to CPRI Dynamic Reconfiguration Design Example
The testbench program controls the testbench components via Avalon® Memory-Mapped Interface access, status and control signals. The Avalon® Memory-Mapped Interface arbiter decodes the Avalon® Memory-Mapped Interface access from the testbench program into multiple Avalon® Memory-Mapped Interface slaves.
Table 16.  Avalon Memory-Mapped Address Range for Simulation Testbench (Ethernet to CPRI protocols Variant)
Address Range Mapping
0x1000_0000 – 0x1000_FFFF P0 Ethernet Registers
0x1080_0000 – 0x108F_FFFF P0 Transceiver Registers
0x1010_0000 – 0x1010_FFFF 25G Packet Client
0x0000_0000 – 0x0000_03FF Dynamic Reconfiguration Controller
0x2000_0000 – 0x2000_003F CPRI Soft Registers
0x2010_0000 – 0x2010_FFFF CPRI PCS Registers
0x2020_0000 – 0x202F_FFFF CPRI Transceiver Registers
Simulation Flow:
  • Ethernet Multirate IP DUT is power-up based on base profile.
  • Initialize the testbench variables based on power-up profile. The parameter settings, located in the basic_avl_tb_top.sv file, are:
    • DR_NUM: To indicate the number of dynamic reconfiguration transitions.
    • DR_SEQ: To indicate the dynamic reconfiguration sequence.
  • Perform dynamic reconfiguration.
  • Start Traffic test.
  • Check the testbench error flag and determine whether testbench passed or failed. The error flag is set to 1 if there is any error after dynamic reconfiguration traffic tests.
For customization, you can modify the DR_NUM and DR_SEQ localparam to configure the test flow. The profile ID is passed to the dynamic reconfiguration IP to configure the intended dynamic reconfiguration task.
  • DR_NUM: Number of Dynamic Reconfiguration transition
  • DR_SEQ: Dynamic Reconfiguration sequence

For example, you want to achieve this Dynamic Reconfiguration sequence: Ethernet 25G-1 > CPRI 24G with RS-FEC > Ethernet 10G-1.

The localparams changes are:
  • Localparam DR_NUM = 2
  • Localparam [6:0] DR_SEQ [DR_NUM-1:0] = {Eth_DR_MODE_10GE-1, CPRI_DR_MODE_24G_RSFEC};
The below RTL snippet shows the Ethernet – CPRI Protocols testbench localparams to Customize:

localparam ETH_DR_Mode_25GE_1	 = 6'b00_00_00;
localparam ETH_DR_Mode_10GE_1     = 6'b00_00_01;
localparam CPRI_DR_MODE_24G_RSFEC = 6'b00_00_10;
localparam CPRI_DR_MODE_24G  	 = 6'b00_00_11;
localparam CPRI_DR_MODE_12G_RSFEC = 6'b00_01_00;
localparam CPRI_DR_MODE_12G   	= 6'b00_01_01;
localparam CPRI_DR_MODE_10G_RSFEC = 6'b00_01_10;
localparam CPRI_DR_MODE_10G       = 6'b00_01_11;
localparam CPRI_DR_MODE_9P8G      = 6'b00_10_00;
localparam CPRI_DR_MODE_6G        = 6'b00_10_01;
localparam CPRI_DR_MODE_4P9G      = 6'b00_10_10;
localparam CPRI_DR_MODE_3G        = 6'b00_10_11;
localparam CPRI_DR_MODE_2P4G      = 6'b00_11_00;
localparam CPRI_DR_MODE_1G        = 6'b00_11_01;

localparam DR_NUM = 3;
localparam [6:0] DR_SEQ [DR_NUM-1 : 0] = {CPRI_DR_MODE_4P9G,CPRI_DR_MODE_24G_RSFEC, ETH_DR_MODE_10GE_1};

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