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VR4102 Datasheet(PDF) 236 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) 236 Page - NEC

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CHAPTER 10 BCU (BUS CONTROL UNIT)
236
10.2.1 BCUCNTREG 1 (0x0B00 0000)
(1/2)
Bit
D15
D14
D13
D12
D11
D10
D9
D8
Name
ROM64
DRAM64
ISAM/LCD
PAGE128
Reserved
PAGEROM2
Reserved
PAGEROM0
R/W
R/W
R/W
R/W
R/W
R
R/W
R
R/W
RTCRST
0
0
0
0
0
0
0
0
Other resets
0
0
0
0
0
0
0
0
Bit
D7
D6D5
D4D3D2
D1
D0
Name
Reserved
ROMWEN2
Reserved
ROMWEN0
Reserved
Reserved
BUSHERREN
RSTOUT
R/W
R
R/W
R
R/W
R
R
R/W
R/W
RTCRST
0
0
0
0
0
0
0
0
Other resets
0
0
0
0
0
0
0
0
Bit
Name
Function
D[15]
ROM64
Sets the capacity of the ROM to be used
1: 64M-bit ROM
0: 32M-bit ROM
D[14]
DRAM64
Sets the capacity of the DRAM to be used
1 : 64M-bit DRAM
0 : 16M-bit DRAM
D[13]
ISAM/LCD
Assigns space from 0x0A00 0000 to 0x0AFF FFFF as the physical address space.
1 : As ISA high-speed memory space
0 : As LCD space
D[12]
PAGE128
Sets the maximum burst acceleration size for Page ROM.
1 : 128-bit (16 byte)
0 : 64-bit (8 byte)
D[11]
Reserved
Write 0 when writing. 0 is returned after a read.
D[10]
PAGEROM2
This is the page ROM access enable bit for the ROM space in banks 3 and 2 (16-bit
mode) or in bank 1 (32-bit mode).
1 : Page ROM
0 : Ordinary ROM
D[9]
Reserved
Write 0 when writing. 0 is returned after a read.
D[8]
PAGEROM0
This is the page ROM access enable bit for the ROM space in banks 1 and 0 (16-bit
mode) or in bank 0 (32-bit mode).
1 : Page ROM
0 : Ordinary ROM



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