參數(shù)資料
型號: UPD70F3134AYGJ-UEN
廠商: NEC Corp.
英文描述: 32-Bit Single-Chip Microcontrollers
中文描述: 32位單芯片微控制器
文件頁數(shù): 41/99頁
文件大?。?/td> 528K
代理商: UPD70F3134AYGJ-UEN
CHAPTER 3 SPECIFICATIONS OF PCI HOST BRIDGE MACRO
Application Note U17121EJ1V1AN
41
3.4.8 SYSTEM_MEM_BASE register
When the main memory is accessed from the PCI device by setting the SYSTEM_MEM_BASE register and
SYSTEM_MEM_RANGE register, the register responds to an access of a matching address.
After reset: 00000000H R/W Offset address: 40H
31
16 15
0
S_BASE
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit Name
R/W
Function
S_BASE
R/W
Sets the higher 16 bits (bits 16 to 31) of the base address on the PCI bus memory space in which
the main memory (SDRAM) is mapped.
3.4.9 SYSTEM_MEM_RANGE register
After reset: 0000FFFFH R/W Offset address: 44H
31
16 15
0
S_RANGE
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Bit Name
R/W
Function
S_RANGE
R/W
Sets the range of the PCI bus memory space in which the main memory (SDRAM) is mapped.
It can be set in 64 KB units.
0000H: 64 KB
0001H: 128 KB
:
000FH: 1 MB
:
00FFH: 16 MB
:
0FFFH: 256 MB
:
FFFFH: 4 GB
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