参数资料
型号: PC87393F-VJG
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: 外设及接口
英文描述: 100-Pin LPC SuperI/O Devices for Portable Applications
中文描述: MULTIFUNCTION PERIPHERAL, PQFP100
封装: TQFP-100
文件页数: 117/148页
文件大小: 1733K
代理商: PC87393F-VJG
2.0 Device Architecture and Configuration (Continued)
70
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2.19.10 X-Bus Memory Base Address Low Byte Register
This register describes the low byte for the user-defined memory zone mapped to the X-Bus (decoded as bits 23 to 16 of
the 32-bit address range; bits 15 to 0 are 0). This register is reset by hardware to 00h.
Location:
Index F6h
Type:
R/W
2.19.11 X-Bus Memory Size Configuration Register
This register defines the size of the user-defined memory zone mapped to the X-Bus. This register is reset by hardware to
00h.
Location:
Index F7h
Type:
R/W
Bit
76543210
Name
User-Defined Memory Zone Address Low
Reset
00000000
Bit
Description
7-0
User-Dened Memory Zone Address Low. Denes the lower 8 bits of the user-dened memory block base
address. The base address should be aligned on the selected block size.
Bit
76543210
Name
Reserved
User-Defined Memory Zone Size
Reset
00000000
Bit
Description
7-4
Reserved
3-0
User-Dened Memory Zone Size. Denes the size in bytes of the zone window. The size is dened as a power
of two using the equation: NumOfBytes = 2n(User-Dened Memory Zone size+16). The zone must always be
aligned to the window size (i.e., for a 128 Kbyte window, the 17 LSBs of the address should be zero.
Bits
Size (Bytes)
3 2 1 0
0 0 0 0
64K (default)
...
1000
16M
Other
Reserved
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