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AMD-K6-2E/233AMZ Datasheet(PDF) 229 Page - Advanced Micro Devices

Part # AMD-K6-2E/233AMZ
Description  AMD-K6??2E Embedded Processor
PDF  332 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AMD-K6-2E/233AMZ Datasheet(HTML) 229 Page - Advanced Micro Devices

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Chapter 9
Write Merge Buffer
211
22529B/0—January 2000
AMD-K6™-2E Processor Data Sheet
Preliminary Information
9.4
Examples
Suppose that the range of memory from 16 Mbytes to 32 Mbytes
is uncacheable, and the 8-Mbyte range of memory on top of 1
Gbyte i s wri t e-c o m b i nab le . Ran g e 0 i s d e f i n e d as t he
uncacheable range, and range 1 is defined as the write-
combining range.
s
Extracting the 15 most-significant bits of the 32-bit physical
base address that corresponds to 16 Mbytes (0100_0000h)
yields
a
physical
base
address
0
field
of
000_0000_1000_0000b. Because the uncacheable range size
is
16
Mbytes,
the
physical
mask
value
0
field
is
111_1111_1000_0000b, according to Table 39. Bit 1 of the
UWCCR register (WC0) is cleared to 0 and bit 0 of the
UWCCR register is set to 1 (UC0).
s
Extracting the 15 most-significant bits of the 32-bit physical
base address that corresponds to 1 Gbyte (4000_0000h)
yields
a
physical
base
address
1
field
of
010_0000_0000_0000b. Because the write-combining range
size is 8 Mbytes, the physical mask value 1 field is
111_1111_1100_0000b, according to Table 39. Bit 33 of the
UWCCR register (WC1) is set to 1 and bit 32 of the UWCCR
register is cleared to 0 (UC1).



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