GTS Transceiver PHY User Guide

ID 817660
Date 7/08/2024
Public
Document Table of Contents

3.10.3.2. Accessing GTS PMA Registers

The following table shows the offset address between lanes that you must add when you want to access the PMA registers for a design with more than one lane. Note that the word address is byte address/4.
Table 61.  Lane Number and Address Offset
GTS Lane Number Configured in the GTS PMA/FEC Direct PHY Intel FPGA IP Offset (Byte Address)
0 0x000000
1 0x100000
2 0x200000
3 0x300000
4 0x400000
5 0x500000
6 0x600000
7 0x700000

Example 1: Accessing PMA Physical Lane Information

For example, if you want to read the physical lane number information for the GTS PMA lanes on the same side of the device, refer to the GTS_LANE_Number register (0x0A5000) in the register map file and add 0x100000h for each incremental lane, as shown below:

  • For Lane 0: 0x0A5000
  • For Lane 1: 0x1A5000
  • For Lane 2: 0x2A5000
  • For Lane 3: 0x3A5000
Note: Lane 0, 1, 2, or 3 are the physical locations where the channels are placed and correspond to CH0, CH1, CH2, and CH3, respectively. You can add an incremental offset of 0x100000 to this address to access up to lane 7 (0x7A5000) to read the physical GTS PMA lane information (if you enable 8 GTS PMA lanes in your design per side and do not Enable Separate Avalon interface per PMA feature in the GTS PMA/FEC Direct PHY Intel® FPGA IP).

Example 2: Accessing PMA Registers for TX Equalization Settings

For example, if you want to update the TX equalizer co-efficients settings for the GTS PMA lanes within a bank, refer to the registers 0x09174C and 0x091750 in the register map file and add 0x100000h for each incremental lane, as shown below:

  • For Lane 0: 0x09174C and 0x091750
  • For Lane 1: 0x19174C and 0x191750
  • For Lane 2 : 0x29174C and 0x291750
  • For Lane 3 : 0x39174C and 0x391750
Note: You can access each GTS PMA channel’s registers in a bank through the same base address. For the example shown, all lanes use the same base address of 0x09174C and 0x091750.