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PC87393 Datasheet(PDF) 68 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC87393
Description  100-Pin LPC SuperI/O Devices for Portable Applications
PDF  148 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87393 Datasheet(HTML) 68 Page - National Semiconductor (TI)

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2.0 Device Architecture and Configuration (Continued)
68
www.national.com
2.19.5
X-Bus I/O Base Address High Byte Register
This register describes the high byte for the user-defined I/O zone mapped to the X-Bus. This register is reset by hardware
to 00h.
Location:
Index F1h
Type:
R/W
2.19.6
X-Bus I/O Base Address Low Byte Register
This register describes the low byte for the user-defined I/O zone mapped to the X-Bus. This register is reset by hardware
to 00h.
Location:
Index F2h
Type:
R/W
2.19.7
X-Bus I/O Size Configuration Register
This register defines the size of the user-defined I/O zone mapped to the X-Bus. This register is reset by hardware to 00h.
Location:
Index F3h
Type:
R/W
Bit
76543210
Name
User-Defined Zone Address High
Reset
00000000
Bit
Description
7-0
User-Defined Zone Address High. Defines the higher 8 bits of the user-defined I/O block base address. The
base address should be aligned on the selected block size.
Bit
76543210
Name
User-Defined Zone Address Low
Reset
00000000
Bit
Description
7-0
User-Defined Zone Address Low. Defines the lower 8 bits of the user-defined I/O block base address. The
base address should be aligned on the selected block size.
Bit
76543210
Name
Reserved
User-Defined I/O Zone Size
Reset
00000000
Bit
Description
7-4
Reserved
3-0
User-Defined I/O Zone Size. Defines the size in bytes of the zone window. The size is defined as a power of
two using the equation: NumOfBytes = 2n(User-Defined I/O Zone size). The zone must always be aligned to the
window size (i.e., for a 128 byte window, the 7 LSBs of the address are zero).
Bits
Size (Bytes)
3 2 1 0
0 0 0 0
1 (default)
...
1000
256
Other
Reserved



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