ID 683267
Date 3/28/2022
Public

## 3.9.2. Describe the Intel® Arria® 10 GX FPGA Development Kit Reference Platform Hardware to the Intel® FPGA SDK for OpenCL™

The Intel® Arria® 10 GX FPGA Development Kit Reference Platform includes an INTELFPGAOCLSDKROOT/board/a10_ref/hardware/a10gx/board_spec.xml file that describes the hardware to the Intel® FPGA SDK for OpenCL™ .

### Device

The device section contains the name of the device model file available in the INTELFPGAOCLSDKROOT/share/models/dm directory of the SDK and in the board spec.xml file. The used_resources element accounts for all logic outside of the kernel partition. The value of used_resources for alms equals the difference between the total number of adaptive logic modules (ALMs) used in final placement and the total number of ALMs available to the kernel partition. You can derive this value from the Partition Statistic section of the Fitter report after a compilation. Consider the following ALM categories within an example Fitter report:

Figure 5. Fitter Partition Statistics
+----------------------------------------------------------------------------------+
; Fitter Partition Statistics                                                      ;
+----------------------+-----------------+-----------------------------------------+
; Statistic            ; l               ; freeze_wrapper_inst|kernel_system_inst  ;
+----------------------+-----------------+-----------------------------------------+
; ALMs needed [=A-B+C] ; 0 / 427200 (0%) ; 0 / 385220 (0%)                         ;

The value of used_resources equals the total number of ALMs in l minus the total number of ALMs in freeze wrapper inst|kernel_system_inst. In the example above, used_resources = 427200 - 385220 = 41980 ALMs.

You can derive used_resources for rams and dsps in the same way using M20Ks and DSP blocks, respectively. The used_resources value for ffs is four times the used_resources value for alms because there are two primary and two secondary logic registers per ALM.

### Global Memory

In the board_spec.xml file, there is one global_mem section for DDR memory. Assign the string DDR to the name attribute of the global_mem element. The board instance in Platform Designer provides all of these interfaces. Therefore, the string board is specified in the name attribute of all the interface elements within global_mem.

• DDR

Because DDR memory serves as the default memory for the board that the a10_ref Reference Platform targets, its address attribute begins at zero. Its config_addr is 0x018 to match the memorg conduit used to connect to the corresponding OpenCL Memory Bank Divider for DDR.

Attention: The width and burst sizes must match the parameters in the OpenCL Memory Bank Divider for DDR (memory_bank_divider).

### Interfaces

The interfaces section describes kernel clocks, reset, CRA, and snoop interfaces. The OpenCL Memory Bank Divider for the default memory (in this case, memory_bank_divider) exports the snoop interface described in the interfaces section. The width of the snoop interface should match the width of the corresponding streaming interface.