External Memory Interfaces Intel® Agilex™ FPGA IP User Guide

ID 683216
Date 11/03/2022
Public

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents

11.10.3.1.1. Global Parameter Table

The Global Parameter Table’s base address is 0x0500_0000 (which is the base address of the user RAM).
Table 172.  Global Parameters
Offset from GPT Base Field Name Field Width (in bytes) Description
0x0 gpt_GLOBAL_PAR_VER 4 Global Parameter Table version number.
0x4 gpt_NIOS_C_VER 4 Firmware version.
0x8 gpt_COLUMN_ID 4 ID of I/O row.
0xC gpt_NUM_IOPACKS 4 Maximum number of I/O tiles in the row that can be used as memory interface.
0x10 gpt_NIOS_CLK_FREQ_KHZ 4 Nios clock frequency (KHz).
0x14 gpt_PARAM_TABLE_SIZE 4 Size (in bytes) of the global and mem interface parameter tables combined.
0x1C gpt_GLOBAL_CAL_CONFIG 4 Asserts whether the debug toolkit is enabled (enabled if bits 0 and 2 are asserted).
0x20 gpt_SLAVE_CLK_DIVIDER 4 Divider for the calbus clock. Value 0 may be observed, indicating that firmware set an optimal value, assuming there is no other master accessing the calbus at the same time.
0x24 gpt_INTERFACE_PAR_PTRS 4 Pointers to memory interface parameter tables. The number of array elements is equal to gpt_NUM_IOPACKS.

offset 0x24 contains the pointer to the first interface (interface ID=0).

offset 0x28 contains the pointer to the second interface (interface ID=1).

offset 0x32 contains the pointer to the third interface, and so forth.

The index of the cal_bus to which an interface is connected determines its interface ID. An interface connected to cal_bus_0 is interface 0, while an interface connected to cal_bus_1 is interface 1, and so forth.

bit[31:16]: Reserved.

bit [15:0]: The pointer to memory interface parameter table, coded as the offset from the start of the user RAM. When a pointer has value 0, it means the memory interface is not used and its parameter table does not exist.