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VR4102 Datasheet(PDF) 255 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) 255 Page - NEC

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CHAPTER 10 BCU (BUS CONTROL UNIT)
255
Figure 10-4. PageROM 4-word Read, 32-bit Mode (WROMA[2:0] = 111, WPROM[1:0] = 10)
RD#
ROMCS[3:0]#
ADD[25:0]
TClock(Internal)
DATA[31:0]
Trom
Tprom Tprom Tprom
Remark
The dotted lines indicate high impedance.
(3) Flash Memory Mode
Set ROMWEN = 1.
This mode is used to meet the electrical characteristics required for writing to flash memory and for accessing
the flash register. This mode can also be used to read to flash memory.
Note that the access time is constant when in this mode.
Figure 10-5. Flash Memory Mode, 2-byte Access
RD#/WR#
ROMCS[3:0]#
ADD[25:0]
TClock(Internal)
Flash Memory mode access cycle



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