WOODWARD 5466-274 Servo hydraulic

The problem is that when units are connected to different electrical outlets, there may be several volts of difference in ground potential. If pin 1 of each device is interconnected with the others via cable, several amperes of current could result. This condition may not only be dangerous for the small wires in a typical cable, but may also produce electrical noise that causes errors in data transmission. That is why Figure E-1 shows no connection for pin 1. Normally, pin 7 should only be connected to the CHASSIS GROUND at one point; if several terminals are used with one computer, the logical place for that point is at the computer. The terminals should not have a connection between the logic ground return and the chassis.

This manual provides general information, preparation for use and installation instructions, operating instructions, and functional description for the MVME188A family of 32-bit Reduced-Instruction-Set-Computer (RISC) Microcomputers (referred to as the MVME188A throughout this manual, unless otherwise noted)

Model Designations

 The MVME188A is available in several models, which are listed in Table 1-1. Note that the basic MVME188A includes only the System Controller (SYSCON) board and the 25 MHz Main Logic (CPU) board. It will not work without adding one, two, three, or four Memory Boards; and one HYPERmodule mezzanine module containing the RISC chips. Enhancements to the MVME188A (over the MVME188) include: • Single-cycle refresh to minimize VCC noise • Increased onboard bypass capacitors • Orthogonal data/address line layout to reduce crosstalk • Onboard shielding of high-speed clock lines • Change from CMOS to TTL drivers to reduce overshoot/undershoot. The MVME188A also offers improved RESET functionality. It performs a full system RESET on MVME188A boards that are not the system controller and are memory mapped at a location other than $0. Both supervisory mode and user mode accesses are now permitted as well.

The MVME188A is an intelligent three-or-more-board 

set microcomputer module containing one or more MC88100 RISC microprocessor(s) and up to eight MC88200 or MC88204 RISC cache/memory management units (CMMUs). The boards are mechanically and electrically tightly connected to form a single unit, and the RISC chips are on a mezzanine module called the HYPERrnodule. The main features of the MVME188A are as follows: • Three or more double-high/single-wide VMEboards including attached HYPERmodule mezzanine module • Multiple RISC MPV/DRAM options on VMEmodule board set • One to four MC88100 RISC microprocessors at 25 MHz featuring: Multiple execution units Floating point operations Single cycle integer, bit-field, branch, load, and store operations

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