Military FPGA universal reconstruction circuit based on JTAG interface

Abstract

The invention relates to a military FPGA universal reconstruction circuit based on a JTAG interface, and the reconstruction circuit is provided with four input pins and four output pins, can be connected with pins of an FPGA, a CPLD and a PROM, receives an instruction of an upper computer, carries out the backward reading IDCODE operation of the FPGA, the CPLD and the PROM in a link through the JTAG interface, determines the model of a device, and according to an instruction of the upper computer, capable of erasing, programming, reading back and checking the selected device through the JTAG interface; by means of the reconstruction circuit, the purpose of designing FPGA and CPLD design programs in an on-site change system after product installation is achieved, external interfaces of products are effectively reduced, the distance of debugging cables is prolonged, and the on-site debugging efficiency of installed products is improved.

Description

technical field [0001] The invention relates to a military FPGA general reconfiguration circuit based on a JTAG interface and an implementation method thereof, in particular to a design program for FPGA and CPLD in an on-site remote change system after product installation, and belongs to the technical field of integrated circuits. Background technique [0002] In current weapons and equipment, SRAM-type FPGA and CPLD are widely used. At present, the mainstream manufacturers of SRAM-type FPGA and CPLD are Xilinx and Altera. In the actual board-level product design, if products from both manufacturers are included, then It is often impossible to put it in the same JTAG daisy chain for debugging and programming, which affects the miniaturization of board-level products; [0003] At the same time, during the field test of installed products, the JTAG interface is usually used to program and change the design program. The disadvantages are that the interface occupies a large are...

AI Technical Summary

Problems solved by technology

[0002] In current weapons and equipment, SRAM-type FPGA and CPLD are widely used. At present, the mainstream manufacturers of SRAM-type FPGA and CPLD are Xilinx and Altera. In the actual board-level product design, if products from both manufacturers are included, then It is often impossible to put it in the same JTAG daisy chain for debugging and programming, which affects the miniaturization of board-level products;

[0003] At the same time, during the field test of installed products, the JTAG interface is usually used to program and change the design program. The disadvantages are that the interface occupies a large area, there are many signal lines, and the debugging cable cannot be extended, which is not conducive to the development of on-site debugging.

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