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VR4102 Datasheet(PDF) 138 Page - NEC

Part # VR4102
Description  64/32-bit Microprocessor
PDF  701 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

VR4102 Datasheet(HTML) 138 Page - NEC

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CHAPTER 5 MEMORY MANAGEMENT SYSTEM
138
5.3.2 System Bus Space
The following three types of system bus space are available.
• System bus I/O space
This corresponds to the ISA’s I/O space.
• System bus memory space
This corresponds to the ISA’s memory space.
• High-speed system bus memory space
The access speed can be set independently of the system bus memory space.
There are 16 Mbytes of high-speed system bus memory space. Therefore, the ADD[25:24] pin is fixed as
10.
When system bus memory has been accessed from the high-speed system bus memory space, the
LCDCS# pin becomes active.
The high-speed system bus memory space is used exclusively from the LCD space. To switch between
these two types of space, set the ISAM/LCD bit in BCUCNTREG1.



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