The XC9500 series CPLD devices are composed of multiple function blocks (FBs) and IO blocks (IOBs), which can be fully interconnected by the switch matrix Fast CONNECT. The IOB provides input and output buffering, each FB provides 36 inputs and Programmable logic capacity for 18 outputs. The Fast CONNECT switch matrix connects all FB outputs and FB inputs. For each FB, 12 to 18 (depending on the pin count of the package) output and associated output enable signals directly drive the IOB.
All XC9500 series CPLD devices are programmed in-system, with a minimum of 10,000 program/erase times and support for the extended IEEE 1149.1 boundary-scan standard. The XC9500's structural features focus on in-system programming requirements and enhanced pin-holding capability. It is possible to avoid redoing expensive printed boards, and the expanded JTAG instruction set allows for various modes of programming mode and in-system diagnostics. Because JTAG extends the performance of ISP to the 1149.1 test standard within its jurisdiction, the XC9500 series CPLD devices can achieve ISP performance through the JTAG interface. The in-system programming performance of the XC9500 series not only provides convenience for field programming and debugging, but also allows the user to program and reprogram the XC9500 series devices already installed on the system's printed board to improve the prototype and update the manufacturing process; Programming performance makes remote control programming possible. The following is an introduction to the implementation of the remote control programming of the XC9500 series CPLD devices.
2 XC9500 series CPLD device remote control programming implementation methodFor the programming of CPLD devices, the traditional method is realized by the field engineer through the PC. The PC must have EZTag or JTAG programmer software, and the PC must be connected to the target board through Xchecker or JTAG cable, and then the JEDEC programming data. Download to the target board's CPLD device. This traditional programming method requires engineers to visit the site, which brings the problem that if the product is to be upgraded, it is very troublesome to upgrade it (mainly to upgrade the function of the CPLD device). The remote control programming described in this paper is different from the traditional programming method. It does not require engineers to visit the site, and only needs to add the programming control circuit to the embedded system during system design.
The block diagram of remote programming is shown in Figure 1. The key to remote programming is communication and embedded download technology. The communication part includes a communication interface and a communication channel, which completes the remote data transmission, and transmits the programming data of the CPLD device generated by the local PC to the embedded download module of the remote target system (ie, the "microcontroller and embedded" shown in the figure. Programming control" section; embedded download technology refers to the use of a microcontroller to implement XC9500 series CPLD device programming through the JTAG interface. Communication can adopt various existing communication technologies, such as communication by modem with telephone line and communication through cable, laser and radio. In this paper, the implementation of communication is not introduced too much. The device is described as an example, focusing on the hardware and software implementation of the microcontroller and embedded programming control.
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