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VR4102 Datasheet(PDF) 248 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) 248 Page - NEC

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CHAPTER 10 BCU (BUS CONTROL UNIT)
248
10.4.3 ROM Interface
(1) Switching among ROM, PageROM, and Flash Memory Modes
The VR4102 supports three modes (ROM, PageROM and Flash Memory). The mode setting in ROM bank 3/2 is
set via BCUCNTREG1’s ROMWEN2 and PAGEROM2 bits, and the mode setting in ROM bank 1/0 is set via the
ROMWEN0 and PAGEROM0 bits. In Ordinary ROM mode or Flash Memory mode, the VR4102 can access to
memories regardless of its mode name. Table 10-5 shows accessible memory types and methods of access in
each mode.
Table 10-5. Summary of ROM Modes
Mode
Setting
Access-enabled devices
ROMWEN2/0
PAGEROM2/0
Memory read
Flash Memory
register read
Flash Memory
write
Ordinary ROM
0
0
Ordinary ROM
PageROM
Flash Memory
N/A
N/A
PageROM
0
1
PageROM
N/A
N/A
Flash Memory
1
don’t care
Ordinary ROM
PageROM
Flash Memory
Flash Memory
Flash Memory
Remark
The initial setting is Ordinary ROM mode.
(2) Access Speed Setting
The VR4102 enables the access speed to be changed when operating in Ordinary ROM mode or PageROM
mode.
For details, see 10.5.1.



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