Blog Post with Youtube VideoHow are Xilinx 7 series FPGA pins defined?

How to download the FPGA pin file ( Pi noout file) during schematic design

1. Xilinx7 series FPGA pin definition

How are Xilinx 7 series FPGA pins defined?

Table 1-1, Xilinx 7 series FPGA pin definitions

The device pins of the FPGA are divided into banks, and each bank is powered independently, so that the FPGA I/O can adapt to different voltage standards and enhance the flexibility of I/O design. Each user bank includes 50 I/O pins or 24 pairs of differential pair pins (48 differential signals), and a single-ended pin for Top and Bottom. Figure 1 shows an example of the K325T chip user Bank IO schematic diagram.

How are Xilinx 7 series FPGA pins defined?

Figure 1. Schematic diagram of K325T chip user Bank IO

In the figure, we can see the two single-ended signals circled in red, the _CC clock pin circled by the green line can be used as user I/O when it is not used as a clock input, in addition, we can also see the blue The marked VREF pin, when the BANK I/O is used as a DDR memory interface , needs to provide the threshold voltage required by the pseudo-differential, and the _VREF_ pin needs to be connected to the reference voltage required by the DDR peripheral. For other I/O pin analysis, please refer to Table 1-1 pin definition description.

2. Xilinx7 series FPGA pinout file download

When we are designing the schematic library, how do we get the definition of each pin of the FPGA? In the ASCII Pinout Files subsection of the 7 Series FPGAs Package Files in Chapter 2 of the UG475 official document, according to the FPGA device family and device package classification, the pinout definition link addresses of all devices in the 7 series are given. The official website gives Pinout files in CSV and TXT formats, we can choose flexibly.

How are Xilinx 7 series FPGA pins defined?

Figure 2. FPGA Pinout download link

How are Xilinx 7 series FPGA pins defined?

Figure 3. Download Pinout from Xilinx official website

We open a Pinout in the form of .TXT, as shown in Figure 4. It can be seen that the file is divided into 8 columns and contains all the key information required for the design schematic: pin number, pin name, pin DDR memory group, pin BANK number, auxiliary group (VCCAUX), super logic domain ( SLR), I/O pin type (configuration, HR, HP, transceiver pins, etc.), and NC pin information related to device Pin-to-Pin compatibility.

How are Xilinx 7 series FPGA pins defined?

Figure 4. Example of Pinout file content

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