XYCOM XVME-428 Analog input module

THE CERN SUBSET CERN only retained those signals from the G-64 standard that were used to interface I/O boards that were commonly available on the market. The support for multi-processing capabilities was removed and the CERN 8-bit CPU module was assumed to be the only master on the bus. Only backplanes without terminators and with a bus clock of 1 MHz were installed. The peripheral address space was restricted to 4KB (0xE000 – 0xEFFF) and these restrictions fulfilled CERN’s specific needs and lead to the third strength of the G-64 standard: interfacing became extremely straightforward and required only inexpensive components. For example, with three ICs from the standard TTL family plus a PIA it was possible to implement a simple 16 channel digital I/O module, compatible with a CERN G-64 bus.

Chassis Hardware and Modules 

At CERN the G-64 bus is a key element in the so-called “G-64 Chassis”, used to supervise power converters [2]. Nearly 800 power converters in service today are equipped with these G-64 Crates. The chassis includes not only the G-64 bus and G-64 modules but also other kinds of modules with the responsibility for some or all the following tasks (depending on the type of power converter): (i) remote control, (ii) status monitoring, (iii) regulation, (iv) firing circuitry, (v) interlocks and protection.

Figures 1 and 2 show the mechanical

 distribution of elements within a typical CERN G-64 chassis. At the front of the upper 3U row is the flat keyboard and the dot matrix display used to locally command the power converter and to display the status and fault information for the human operator. Additionally the display and keyboard is used as an access door to the G-64 bus behind. This protects the cards from be disturbed accidentally. The lower row of figure 1 shows the connectors for external signals such as timing and interlocks. In some cases these connectors are placed at the back. Figure 2 shows the same view but with display and connector panel removed to reveal the modules behind. The G-64 backplane is shown in grey on the left of the upper 3U row. The rest of this row is for the analogue backplane. In the lower 3U row a commercial power converter is shown.

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