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VR4102 bảng dữ liệu(PDF) 138 Page - NEC |
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VR4102 bảng dữ liệu(HTML) 138 Page - NEC |
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138 / 701 page ![]() 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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