Improved VXI bus multi-module carrier plate

Abstract

The invention discloses an improved VXI bus multi-module carrier plate, wherein local bus signals for interfaces between the carrier plate and a carrier module are expanded and a CPLD-based carrier interface circuit is provided. Thus, the conversion of a VXI bus to a local bus signal is realized. The carrier plate provides A16CS*and A24CS*two address gating signals to carrier modules, so that the VXI bus can directly operate thesdules by means of A16 and A24 through a bus conversion circuit on the carrier plate; the carrier plate is additively provided with a 4 bit A24 space capacitance dial switch for each carrier module and a A8-A23 address signal wire which is connected with the carrier modules besides a A16 logic address dial switch which is set for each carrier module, so that A24 maximum memory space is increased at 8MB; and the sizes of the carrier modules are properly enlarged, so that the ratio of the available area of the carrier modules to the area of the carrier plate is increased at morethan 61%, so that users are convenient for developing a virtual instrument module which is carried on the carrier plate and is specially used for test by themselves. The carrier plate is good for thepopularization and the application of a VXI bus technology, and can improve the expansibility and the flexibility of an ATE system.

Description

technical field [0001] The invention belongs to the field of automatic test equipment (ATE), in particular to an improved VXI bus multi-module carrier board structure. Background technique [0002] VXI bus technology is a modular virtual instrument technology that integrates electronic instrument technology and computer technology. Since its inception in 1987, after a long period of development, it has become the mainstream platform for the current aviation and aerospace automatic test systems, and has also been recognized in my country. Wide range of applications. [0003] Considering the diversity and complexity of electronic equipment, the VXI test system needs to provide various types of excitation and test capabilities for the equipment under test. Therefore, with the development of modular instrument technology, foreign manufacturers learn from the VME bus for the industry standard of mounted modules. : ANSI / VITA 12-1996, American National Standard for the Mezzanine Co...

AI Technical Summary

Problems solved by technology

[0005] (1) The addressing space is too small: the address lines provided by the carrier board to the M module are only MA1~MA7 (256 bytes), so that the operation control and data exchange of the M module by the VXI bus system, as well as the functions that the M module can realize , are greatly restricted

[0006] (2) It is impossible to distinguish between A16 / A24 operations: According to the VXI specification, each VXI module has a 64-byte configuration register space in the A16 space, and other registers of the M module must be placed in the A24 space

However, there is only one CS* signal on the socket provided to the M module on the carrier board, and the VXI bus cannot directly perform A16 and A24 operations on the M module.

[0007] (3) The design is complex: when the power is turned on, the carrier board must automatically read the contents of the configuration register of the M module from the FEH address of the M module, and transfer it to the corresponding register of the carrier board for slot 0 of the VXI chassis. Manager accesses with A16 operation

[0008] (4) The A16 space cannot be fully utilized: the basic content of the VXI module configuration register generally only needs 8 bytes. Since the M module cannot distinguish between A16 and A24 operations, the remaining bytes of the A16 space cannot be fully utilized

[0009] (5) It is difficult for users to design and develop M modules on the carrier board: when power is turned on, the carrier board reads and dumps its configuration information from the M module interface, and then provides access to the VXI bus manager

The circuit and program of this complex process are completely invisible to the user. It is very difficult for the user to design and develop the M module by himself and ensure its compatibility with the carrier board.

[0010] (6) The panel cannot complete product development: the M module breadboard provided by the manufacturer for the user has converted the interface signal again, and the internal circuit is also completely invisible to the user

[0011] (7) The area of ​​the M module is relatively small: the carrier board is designed to carry 6 single-width M modules, and the size of each M module is 53mm×148mm, and the instrument functions that can be realized are greatly limited

[0012] (8) The suitable area of ​​the carrier board is relatively low: due to the limitation of the size of the front panel of the carrier board, only 4 modules can actually be connected to the outside through the user connector for signal cross-connection, and the area suitable for carrying the M module on the carrier board is 31376mm 2 (41.4% of carrier board area)

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