PS/2
The keyboard and mouse interfaces are implemented by simple serial ports conforming to the defacto
industry standard PS/2 specification. Both the keyboard and mouse have a dedicated serial port of their
own. The interface ports rely on the software to provide all of their intelligence; therefore, they do not
interpret the characters passing through them in either direction. The interface to the host processor is
through 6 one–byte registers for each port. The keyboard and mouse are connected to the system via
standard PC–style, miniature DIN connectors. The keyboard is a PC compatible 101 and 102 key layout
PS/2–style with a cable length of 7.5 feet. The 3–button mouse (A2839A) comes with a 9 foot cable. The
mouse can be ordered separately. We do not recommend extending the keyboard or mouse cables beyond
15 feet, due to signal degradation.
Central Processing Units
This section describes the J Class CPUs, processor module, and cache memory.
CPU
General Overview
The PA7200 CPU module is designed to work with J Class workstations. It offers the next step in
performance after the 7150 PCX–T based module. Not only does it offer a higher performance processor,
the bus interface also provides higher bandwidth than its predecessor. Finally, the bus and processor
support symmetric multi–processing, and hardware based cache coherency. The CPU module consists of
a processor, split Instruction and Data cache, and a bus interface. Different performance points can be
achieved by adjusting three factors: processor clock frequency, bus clock frequency, and cache size.
Introduction
The electrical interface between the CPU module and the rest of the system is composed of power, clocks,
the interconnect bus interface, and test interface. Most power and ground and all logical signals are routed
through an impedance controlled Micropax connector. The two remaining power sources, VDH and VDL
are routed through 2 Metral power connectors. Identification of the module clock rate, cache size, and
processor voltage requirements are provided with static lines, hardwired on the module.
Signal Description
Micropax and Metral Power Connectors
The CPU module has 2 Metral power connectors and a single 200–pin Berg Micropax connector as its
external system interface.
The 2 Metral power connectors receive Vdh and Vdl from the external system. Each Metral power
connector consists of two receptacles. In the J Class systems, only one power receptacle is used at any one
time. The Metral connectors also serve as alignment pins to guide the CPU module onto the system board.
Vdd and all logical connections are connected through the 200–pin Micropax connector. The signal pad
pitch is 25 mils and the pads are placed in 2 rows in an offset pattern. There are 124 logical signal pins, 16
Vdd pins, 57 Ground pins, and 2 +12 volt and 1 no connect (spare). The signal to ground ratio is 2:1.
Please refer to Table 2–4 for a summary of the interface signals and power bus. Also, refer to the
Micropax Connector Pinout.
Summary of Contents for Visualize J200
Page 75: ... Figure 6 2 Package Tray Bottom View Figure 6 3 Unpacking Pictorial ...
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Page 82: ... Figure 8 1 Danish Keyboard ...
Page 83: ... Figure 8 2 French Keyboard ...
Page 84: ... Figure 8 3 German Keyboard ...
Page 85: ... Figure 8 4 Italian Keyboard ...
Page 86: ... Figure 8 5 Japanese Keyboard ...
Page 87: ... Figure 8 6 Korean Keyboard ...
Page 88: ... Figure 8 7 Norwegian Keyboard ...
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Page 90: ...8 10 Keyboard Layouts J Class Technical Reference Figure 8 9 Swedish Keyboard ...
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Page 92: ...8 12 Keyboard Layouts J Class Technical Reference Figure 8 11 Taiwanese Keyboard ...
Page 93: ...8 13 J Class Technical Reference Keyboard Layouts Figure 8 12 United Kingdom Keyboard ...
Page 94: ...8 14 Keyboard Layouts J Class Technical Reference Figure 8 13 United States Keyboard ...